August Insect Phenology

by Carl Strang

I was able to accumulate first-of-the-year sightings for 11 insect species at Mayslake Forest Preserve in August that could be compared to last year’s dates. These ranged from 44 days earlier to 77 days later, with a median of 11 days earlier. The extremes in range are greater than I see in plants, and usually reflect either different generations of insects within a season (I missed spotting representatives of an earlier or later generation in one year or the other), or uncommon species.

I also added 13 new species to the preserve’s list. Some of these I have mentioned in earlier posts (straight-lanced meadow katydid, citrine forktail, and fork-tailed bush katydid). Others were the black blister beetle,

meadow fritillary,

common buckeye,

ailanthus webworm,

fiery skipper,

and green cloverworm moth.

The fiery skipper is a southern species that moves north in considerable numbers in some years. The green cloverworm moth is distinctive enough that the blurry photo is sufficient to identify it, a common species whose presence is expected. The remaining new species were eastern tailed-blue, common true katydid, jumping bush cricket, and swamp cicada. As mentioned in an earlier post, I have been alert for the presence of the swamp cicada in DuPage County, and was pleased to hear single individuals singing on three different days at Mayslake in August.

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