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Striped beetle - Trirhabda virgata

Striped beetle - Trirhabda virgata
Pennypack Restoration Trust, Montgomery County, Pennsylvania, USA
June 27, 2004
At first I thought that it was a striped cucumber beetle, but now I don't think so and I have no idea what it is.
Southeastern PA

probably Trirhabda virgata LeConte -- det. S.M. Clark
Moved from Trirhabda.

Beatriz provided two additional photos with wider views of the plant, which I identify (based on hairy stem and dense, bracteose umbel) as Queen Anne's Lace (Daucus carota), a.k.a. Wild Carrot (in Apiaceae). Daucus is not listed as a host plant for Trirhabda on the BG Info Tab, although it does mention "weedy fields" in the habitat description, a typical setting for Queen Anne's Lace. Other plants mentioned by Beatriz as associated with Daucus at this locality include knapweed (Centaurea) and yarrow (Achillea), again typical of a weedy field; these are in the aster family (Asteraceae), which is broadly mentioned as containing food plants utilized by Trirhabda.

Chrysomelidae: Trirhabda
Chrysomelidae: Trirhabda, perhaps. Pronotal shape looks correct, a little spiny projection in middle. Antennae also yellow-and-black.

Compare Dillon (1), plate LXXI #5-7: T. virgata, bacharidis, canadensis. Insects of Cedar Creek, North Dakota State University: Trirhabda canadenis, T. borealis

I thought this was a Disonycha at first, but pronotum and antennae look wrong. I think the genus Trirhabda looks good. Cute little critters.

Patrick Coin
Durham, North Carolina

Thanks Patrick, you are always so helpful!

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