Species Thyanta calceata

Thyanta calceata (Say 1831)

7.0-10.5 mm(1)

overwintering forms often, but not always, brown, e.g.:

Can be distinguished from the similar Thyanta custator accerra by the presence of black anterolateral margins of the pronotum but this character is not sufficient to distinguish T. calceata from T. custator custator. Where their ranges overlap, across the atlantic coastal plain, examination of the male genitalia is necessary to distinguish the species. Based on the distribution maps, T. calceata should be absent in central or southern Florida, so specimens with a black anterolateral margin from that location are likely to be T. custator custator (2).

e. US (MA-MI-e.KS to n.FL-e.TX)(2)

polyphagous

5th instar nymph: .

The 5th instar nymph also appears to have a black anterolateral margin of the pronotum.

Thyanta custator accerra and Thyanta custator custator.

McPherson, J.E. 1977. Notes on the biology of Thyanta calceata (Hemiptera: Pentatomidae) with information on adult seasonal dimorphism. Annals of the Entomological Society of America 70(3): 370-372.