Miscellaneous Encounters

by Carl Strang

It’s time to shake more photos out of the bag, as we are well into the seasonal transition. Back when the weather was hot, a male blue dasher posed at St. James Farm.

For some reason I hadn’t previously been successful in getting a good photo of a male. The forward-cocked wings are a characteristic of the genus.

A few weeks ago some odd looking mushrooms came up beneath a cluster of conifers at Mayslake.

I recognized these from my years in Pennsylvania: old man of the woods. The peculiar flaked surfaces of cap and stem are distinctive.

Recently I shared a photo of a greenstriped grasshopper nymph. At the time, I wondered whether the brown colors of males and the green colors of females might appear as early as the nymph stage. The earlier individual was brown.

Last week I ran across this green one.

So both colors at least are present in the fall. Though I cannot say for sure, the simplest explanation is that the gender-specific colors appear this early in development.

Also last week, a young house centipede explored my office walls.

I marvel at their ability to control all those long legs on a smooth vertical surface.

Of course, one advantage is that the many feet provide lots of little grippers.

May Insect Phenology

by Carl Strang

As was the case with flowering phenology, insect species that first appeared in May did so earlier than in recent years at Mayslake Forest Preserve. The median difference between this year and last was 14.5 days earlier for 18 species, with a range of 86 days earlier to 5 days later. The median difference between 2012 and 2011 was less, at 8 days earlier for 15 species, ranging 21 days earlier to 46 days later. The difference was larger again with respect to 2009, a median of 16.5 days earlier for 14 species, ranging 95 days earlier to 46 days later.

Many of the early species were dragonflies, possibly finishing their development more quickly as waters warmed early this year. The first blue dasher appeared 9 days earlier than last year, 21 days earlier than in 2010, and 14 days earlier than in 2009.

With soil warming and plants growing so much more quickly, it is no surprise that plant-eating insects also were represented among the early species.

I saw the first least skipper on May 22 this year, June 8 last year, June 10 in 2010 and June 2 in 2009.

A third category was migrants, with the monarch butterfly being the iconic species here.

The first monarch arrived on May 4 this year, May 11 last year, May 19 in 2010 and May 26 in 2009.

Though local conditions would not have brought migrants here sooner, much of the U.S. had an early spring which could translate into quicker development of the offspring of those monarch migrants that overwintered in Mexico.

Mayslake Odonata Update

by Carl Strang

The weather has been rainy, gloomy and cool on many recent days, but when the sun appeared so did the insects. At Mayslake Forest Preserve I have been able to add new species and observations that provide a foundation for future study. Eastern forktail damselflies already have been busy laying eggs in May’s Lake.

Eastern forktails laying eggs b

Meanwhile, other damselflies are emerging. The next two photos are, I believe, of common spreadwings, a male

Common spreadwing b

and a female.

Common spreadwing female 3b

Having newly emerged, they are holding their wings together more than usual. Another spreadwing species is the slender spreadwing.

Slender spreadwing 1b

Note the contrasting pale veins of the wingtips. Another, blurry photo established that the abdomen has the characteristic length, twice that of the wings. I have seen orange bluets at both of the preserve’s lakes.

Orange bluet b

Familiar bluets also have begun to appear.

Familiar bluet b

The year’s first blue-fronted dancer was a female.

Blue-fronted dancer female b

Its abdomen is dark, including the sides of the tip, and has only a very narrow pale line down the top. Shifting now to dragonflies, I’ll start with a 12-spotted skimmer that began patrolling the stream corridor marsh in June. I expect the species to be common there. This one I photographed elsewhere in 2004.

12-spotted skimmer b

Blue dashers have been active out in the fields, and soon will be appearing at lakes and marshes.

Blue dasher female 1b

A jade clubtail has staked out a piece of the May’s Lake shore.

Jade clubtail b

Cruising farther out are the prince baskettails. Here is a UFO-ish shot of one.

Prince baskettail UFO b

And here is a common baskettail  showing the basal wingspots that are visible on some, but not all individuals.

Common baskettail spot b

A final, cautionary photo:

Eastern forktail new female b

This is not an orange bluet, but a newly emerged female eastern forktail. Note the absence of the orange at the abdomen tip plus the expanded orange area at the base of the abdomen.

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