July 23, 2014 at 5:58 am (botany, plant-eating insects, singing insects)
Tags: Arphia sulfurea, Braidwood Dunes, Diceroprocta vitripennis, Gilia rubra, green-winged cicada, Jasper-Pulaski, Melanoplus angustipennis, narrow-winged grasshopper, standing cypress, sulfur-winged grasshopper
by Carl Strang
A few hours of singing insect searching over the weekend produced 8 county records (across 3 counties), and some photos I’d been hoping to get. High on the list of priorities for the latter this year was the green-winged cicada, Diceroprocta vitripennis. I found a number of them singing Saturday at Jasper-Pulaski State Fish & Wildlife Area in Indiana. Finding a singing cicada up in a tree is a challenge when it can be done at all. The good part is that I found one.
The less than great part is that the only line of sight was from a distance and through a canopy hole, so I will hope for a better opportunity at another time.
I also heard one of that species singing Sunday at Braidwood Dunes in Will County, my first Illinois location. So far all have been in black oak sand savannas.
Back at J-P, I was able to catch a sulfur-winged grasshopper, so as to get a photo of the bright yellow hind wing.
If anything, the yellow was more intense than the photo indicates.
The critter stayed put when I released it, making a portrait possible.
Though study of reference material confirmed the ID, this one was much paler than the individual I photographed within 50 feet of this location last year.
That 2013 hopper may have had the more typical color pattern. I saw its twin at Braidwood Sunday.
Nearby at J-P was a pair of grasshoppers that begged to be photographed. They do not belong to either of the singing subfamilies of grasshoppers, but they were attractive to look at.
These appear to be narrow-winged grasshoppers, Melanoplus angustipennis.
As I drove out of J-P, I was arrested by this group of plants beside the road.
Brilliant red flowers topped the tall stems.
They appear to be targeting hummingbirds as pollinators.
The foliage accounts for the odd name (for an herbaceous plant) of standing cypress.
Gilia rubra is native to the southern states, but has established some colonies of escapes from cultivation in the sand counties of northwestern Indiana.
July 18, 2014 at 4:27 am (plant-eating insects)
Tags: Anania funebris, Baptisia leucantha, Caenurgina erechtea, confused eusarca, Coronilla varia, crown vetch, Erynnis baptisiae, Eusarca confusaria, forage looper, Mayslake, white wild indigo, white-spotted sable, wild indigo dusky wing
by Carl Strang
The remaining photos in the hopper are of Lepidoptera, mainly moths, but we’ll begin with a butterfly.
Wild indigo dusky wings usually don’t wander far from their food plants at Mayslake Forest Preserve, which has both white wild indigo and, until the restoration team succeeds in eradicating it, crown vetch.
Now for two views of different individuals of a geometrid moth called the confused eusarca.
This is a common color pattern in geometrids. One important distinguishing detail for this species is that the long line does not reach the wingtip.
This oblique angle provides additional detail, as well as offering an opportunity to see some individual variation.
The forage looper is a very common moth in our area.
This white-spotted sable was not interested in giving me a dorsal angle, so I settled for an oblique ventral one.
July 16, 2014 at 5:50 am (dragonflies and damselflies)
Tags: Anax junius, Arigomphus submedianus, Celithemis eponina, common green darner, common pondhawk, common whitetail, Erythemis simplicicollis, Halloween pennant, jade clubtail, Lestes unguiculatus, Libellula lydia, lyre-tipped spreadwing, Mayslake
by Carl Strang
Odonata continue to show well at Mayslake Forest Preserve. Today’s photo gallery features some recent sightings.
This male spreadwing clearly was not a slender spreadwing, which species has dominated the spreadwing damselfly fauna at the preserve this year. I generally photograph these from the side and above, as I haven’t yet internalized their distinguishing features.
The abdomen tip tells the tale, both with the triangular black intrusion in segment 8, and in the shape of the terminal appendages, which demonstrate why this species has been named the lyre-tipped spreadwing.
This is only the second or third time I have encountered that species at Mayslake. A dragonfly which likewise has made few appearances is the Halloween pennant.
This teneral individual was perched near Mays’ Lake, from which it probably emerged.
The following dragonflies are regulars, but no less beautiful for that.
Common green darner
Jade clubtails have been resting on algal mats in the lakes.
One of the fiercest dragonflies for its size, a common pondhawk.
Common whitetails are easy photographic targets, as they often rest on the ground.
July 14, 2014 at 5:00 am (botany, insects (other), invertebrates (other), mammals, plant-eating insects)
Tags: Bombus auricomus, chipmunk, Daucus carota, Mayslake, Mecaphesa asperata, northern crab spider, Queen Anne's lace, Ranunculus flabellaris, Strangalia luteicornis, yellow water crowfoot
by Carl Strang
Photographs have been accumulating in the blog file, but the inspiration to tie them together sensibly hasn’t come, so this week I will simply empty the file out. These all are from Mayslake Forest Preserve, and today’s collection is a miscellaneous one.
We’ve had more rain than usual this far into the summer. Here some fresh mud captured a set of chipmunk tracks.
The parking lot marsh surprised me last week with an array of a plant new to the preserve. This is an aquatic buttercup, the yellow water crowfoot.
This has been a good year at Mayslake for a bumblebee species that varies in numbers considerably between years: Bombus auricomus. The yellow cap on the head, large size, and bold black and yellow pattern are distinctive.
Queen Anne’s lace is blooming, and on Friday it pointed me to two arthropods new to the Mayslake list. This one has a name I like: Strangalia luteicornis. It is a woods-edge long-horned beetle whose larvae bore into woody plants including grape vines.
Here a northern crab spider, Mecaphesa asperata, feasts on a flower-visitor fooled by the spider’s camo.
July 11, 2014 at 5:50 am (singing insects)
Tags: Horlock Hill, Okanagana balli, prairie cicada, West Chicago Prairie, Wolf Road Prairie
by Carl Strang
Prairie cicadas are small, early-season cicadas that I first met on July 4 of last year at Woodworth Prairie in Cook County. Soon after that I found them at West Chicago Prairie and Belmont Prairie in DuPage County. Researchers at Woodworth have documenting them as emerging during a relatively brief period, mid-June to mid-July. This year I have been making weekly checks at West Chicago Prairie, and they did not appear until last Sunday, July 6.
This one sang from a bush clover stalk.
That opened the door to seeking them on other sites, and I have been to two of them so far. I failed to find prairie cicadas at Horlock Hill Prairie in Kane County and at Wolf Road Prairie in Cook County. That spoils my working hypothesis that they would prove to be indicators of prairie remnants.
Here’s another West Chicago Prairie cicada, singing from a dead stem.
I hope to squeeze in a few more site checks in the next couple of weeks, but already I have the sense that this species is very limited in the locations where it occurs. I’ll also hope to get a sense of how long they are out at a given site. The July 6 appearance seems late, but this has been an odd year phenologically. So far the 11 species of singing insects have ranged from the earliest starting date in my record to nearly the latest, and the median is right in the middle. That is a little surprising given the severity and length of the winter, but first flower dates (which I hope to analyze soon) have been equally all over the place.
July 7, 2014 at 5:44 am (physics)
Tags: light, eclipse, sun dapples
by Carl Strang
Recently I noticed a patch of sun dapples on the trail, and was reminded of a surprising observation from a decade or two ago.
Notice how they all are circular in shape, with fuzzy outlines.
There was a mid-day eclipse of the sun that day, not total but the moon covered a significant percentage. I happened to be where there were patches of sun dapples like these, and as the eclipse progressed I was amazed to see the dapples changing shape. They all were images of the eclipse, at the peak showing little crescent suns.
Warnings had been broadcast in advance of the event, reminding people not to look directly at the eclipse, but to create a pinhole camera effect, holding two sheets of white cardboard, the one closer to the sun with a pinhole in it. The image of the eclipse would be formed on the back sheet, and could be sharpened by changing the distance between sheets. I realized that the tiny spaces between the leaves in the tree canopy above were, in effect, tiny pinholes, and the ground was covered by myriad images of the eclipse. The ground was not the correct distance from the canopy to produce sharp images, but they were clear enough to show the effect. The implication is that these dapples always are giving us images of the sun, as in the photo above.
July 2, 2014 at 5:35 am (singing insects)
Tags: Blackwell, Chortophaga viridifasciata, dog day cicada, gladiator meadow katydid, green-striped grasshopper, Linne's cicada, Metrioptera roeselii, Orchelimum gladiator, Roesel's katydid, Tibicen canicularis, Tibicen linnei
by Carl Strang
We are at a point in the season where the spring-singing insects are finishing, and the early summer brings new voices to the chorus. Green-striped grasshoppers seemed to tail off rapidly in their crepitating flights this year. I have heard very few in recent weeks.
The male green-striped grasshopper usually is brown. He’s the one who does the displaying.
The object of his displays usually is green, and a bit bigger than him.
Roesel’s katydids rapidly are increasing the number of buzzes they are contributing to the meadows and prairies.
Note the blur in the wings as this short-winged Roesel’s katydid sings. Some individuals have much longer wings.
Over the weekend I heard first songs from three additional species: Linne’s and dog day cicadas, and the gladiator meadow katydid.
This was one of several gladiators singing beside the Regional Trail in south Blackwell Forest Preserve Saturday evening.
Those Tibicen cicadas, especially, characterize the sound of summer for me.
June 30, 2014 at 5:44 am (birds)
Tags: Canada goose, cedar waxwing, common yellowthroat, green heron, Mayslake, muskrat, red-winged blackbird
by Carl Strang
It seemed the ideal situation. Muskrats had built an enormous mounded den in the center of the parking lot marsh at Mayslake Forest Preserve, and it was a sure bet that it would platform a Canada goose nest in the spring. Sure enough.
A female incubating her nest on April 15.
Something happened. The nest was abandoned before incubation was completed. The water is deep, and it’s hard to imagine a coyote making that swim for so small a return. The story wasn’t over, though, as a second attempt was underway by early June.
The same pair? Cannot say, but there was a new nest under incubation by June 3.
This was very late, but still there would be plenty of time to get young flying by fall. The result, however, was the same.
By June 24 the nest had been abandoned. The eggs appear to be intact.
To close on a more positive note, I will share some recent portraits of Mayslake’s other birds.
Green herons have been regulars in the marshes and lakes.
A red-winged blackbird carries lunch for her nestlings.
A single common yellowthroat is all I’ve been hearing on the preserve.
This cedar waxwing thoughtfully lifted its crest as I aimed the camera.
June 27, 2014 at 5:43 am (plant-eating insects)
Tags: eastern comma, Haploa lecontei, Haploa reversa, large lace-border, LeConte's haploa, Mayslake, Polygonia comma, Polygonia interrogationis, question mark butterfly, reversed haploa, Scopula limboundata
by Carl Strang
I added the exclamation point in the title to fill a gap left by our punctuational butterflies. Eastern commas are usually fairly common at Mayslake Forest Preserve.
This recent example shows the source of the butterfly’s name: a contrasting silver or white mark on the underside of the wing is reminiscent of a comma.
The week before, I thought that one of the comma’s less frequent relatives appeared.
There seems to be a separation here, a curved line plus a dot.
Later I had to conclude that this was a question mark wannabe, a comma with a disruption in its namesake line. This was made clear by the upper wing pattern.
The pattern of black spots on the forewing is that of an eastern comma.
There have been appearances by two different moths in the same genus, and no ambiguity in this case.
This was a LeConte’s haploa on June 9. Note the gaps in the dark lines at the corners of the wings.
Ten days later a reversed haploa appeared. The dark lines are connected.
These are tiger moths that commonly emerge this time of year, and I continue to see individuals of both species at Mayslake. The haploa caterpillars generally feed on a wide variety of plants, but I have no information on their local diet range.
Another common moth is the large lace border, one of the geometrid or inchworm moths.
Not a big moth, contrary to the name, wingspan perhaps an inch.
Again, the relative abundance of this species probably is tied to its broad dietary range, which includes plants in several families.
June 25, 2014 at 5:50 am (ecology, singing insects)
by Carl Strang
For a few years, now, I have been puzzling over the geographic distribution of our two field crickets, the spring field cricket and the fall field cricket, in DuPage County. Though these two sibling species occur together in most places, they don’t always do so, and I have been conducting driving surveys to map out where each species may be found. Here is the map as of the end of last year:
Green circles represent places where both species may be found. Yellow circles are fall field crickets only, blue circles are spring field crickets only.
Many of the yellow circles were places where the habitat looked good for both. After last year’s survey, however, I read that spring field crickets sing more in the morning than in the evening, when I had been listening. Over the past couple of weeks I have returned to all the yellow circle areas, and was able to revise the map.
If you compare, you will see that many of the yellow circles now are green.
It became clear that the places which remained without spring field crickets all had inappropriate habitat. Most of them were all pavement or mowed lawn, some were wetlands, some were wooded. Fall field crickets are more tolerant of some of those areas, and so their more widespread distribution can be accounted for by current conditions.
Fall field cricket, male
Those few blue circles now represent the unresolved aspect of the story. Most of them I have checked more than once, and all seem to be good habitat. This may be some accident of history, a local population being removed by a past event. If that is it, the crickets may immigrate and re-establish themselves. I plan to check those places again, perhaps in a couple of years, to see if that happens.
There is a clear precedent at Mayslake Forest Preserve this year. It’s my 6th season of surveying that site, and the first in which there have been spring field crickets, 4 widely scattered individuals. Fall field crickets should be at least as able to disperse.
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