Handsome Trig Hijinks

by Carl Strang

Last year I followed a tip from Joe Balynas and found handsome trigs (Phyllopalpus pulchellus) established along the Cal Sag Channel, an extension of the Calumet River, in southern Cook County. This apparently was the first finding of the species in northern Illinois.

The handsome trig’s scientific name translates to something like “beautiful little leaf-mouth,” a reference to the expanded tips of its palps.

The Cal Sag Channel points toward the southeast corner of my own DuPage County, and I resolved that this year I would follow the trails along that waterway, and discover how far the trigs had come. That plan was blown to pieces on August 18. I was running along a recreational trail in Wheaton, central DuPage, when I heard the ratcheting mechanical trill of a handsome trig. I stopped to search, and was amazed to find four of the little crickets on the underside of a burdock leaf. Over the following weeks, I heard handsome trigs in scattered other locations in the southern half of DuPage County. I went back to southern Cook, and rode my bicycle west along trails that follow the Des Plaines River, past the point where it forms a complex with the Cal Sag Channel and the Chicago Sanitary Canal. Handsome trigs were audible at intervals along the trail, all the way into DuPage County’s Waterfall Glen Forest Preserve. This was one route by which the species may have reached my county.

What the hey? I have been able to recognize the handsome trig’s song for years, now. I had not found them in my own home county until 2017, and now suddenly they are in scattered spots across southern DuPage. Something about this year has favored the species, as they seem to be more numerous across the Chicago region. In 2017 I also added records for Will County, Illinois, Starke County, Indiana, and Berrien County, Michigan. This last is a new find for southwestern Michigan, but not for the state, as a recent paper reported them in southeastern Michigan (O’Brien, Mark F., and Julie A. Craves. 2016. Phyllopalpus pulchellus Uhler, the handsome trig (Orthoptera: Gryllidae), a confirmed Michigan resident. Great Lakes Entomol. 49:202-203).

The handsome trig is another species of singing insect that is expanding its range northward. It seems reasonable to think that they quietly have been spreading in DuPage County for years, but conditions in 2017 elevated their little local populations to the point where they drew my attention. I will be interested in following their numbers and possible ongoing range extension in coming seasons.

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