Extracted from Western Bees obtained by the American Museum Expeditions by Cockerell (1921). |
Differs a little from the type in having a very fine supraclypealline
just above the clypeus, and a small spot on each side of clypeus. The
clypeal mark is trilobed, the lobes acute, like a leaf. Swenk considered
this to be a synonym of P. asclepiadis Cockerell, but it has much darker
wings and must, I think, be regarded as distinct.