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Photo#516325
Sphacophilus apios (dark form, atrescens), adult - Sphacophilus apios - male

Sphacophilus apios (dark form, atrescens), adult - Sphacophilus apios - Male
1 mile west of Charleston, Coles County, Illinois, USA
May 13, 2011
Size: Head to tail, 5.5mm
This adult sawfly is the same individual as the upper larva seen in the linked image. It was collected as a larva feeding on leaves of Orbexilum onobrychis (Fabaceae) on 5 May, 2011. It spun a cocoon the following day, and on 13 May, 2011, it emerged as the adult shown here.

Based on male genitalia (see linked image), this sawfly keys to S. apios. The adult of this species occurs in two discrete color forms. Nominal S. apios is black and bright orange (see here). The insect shown here is the alternative "dark" incarnation of S. apios, which was designated as form atrescens by Ross 1933 (Proceedings of the Entomological Society of Washington 35: 13-19).

Images of this individual: tag all
Sphacophilus apios (dark form, atrescens), larvae - Sphacophilus apios Sphacophilus apios (dark form, atrescens), adult - Sphacophilus apios - male Sphacophilus apios (dark form, atrescens), male genitalia - Sphacophilus apios - male

Moved
Moved from Sphacophilus.

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