20 s of calling song; male from Berrien County, MI; 25.6°C. (WTL488-4)
Click on sound bar to hear graphed song.
Sound spectrogram of 2 s of calling at 25.6°C (from WTL488-4). Dominant frequency
Identification: G. veletis and G. pennsylvanicus cannot be reliably distinguished by either song or external morphology (although in some localities the ovipositors of G. pennsylvanicus average substantially longer than those of G. veletis). However, G. veletis overwinters as mid-to-late instar juveniles, whereas G. pennsylvanicus overwinters in the egg stage. Both species have only one generation per year. Consequently, G. veletis adults are most abundant in spring and G. pennsylvanicus adults are most abundant in fall. In all localities where the species have been studied, a few adults of the two species occur together in midsummer.