Species Pimpla sanguinipes

"erythropus and sanguinipes might really be two separate species, judging from the fact that they occupy different habitats: sanguinipes in arid areas and erythropus in forested areas. Townes even had differences in punctation for the two. His concept of subspecies was very dubious, and he did not strictly apply the concept in a geographical sense and named many sympatric subspecies, many of which I relegated to synonymy in the 1979 catalog. But this case was different, and I might have just elevated the two taxa to species level but did not. I don't remember if I had a reason for not doing it, but maybe it was because there was a dearth of specimens in the National Collection from which I could form an opinion." (Robert W. Carlson, pers. comm. to =v=, 9/30/09)

Eric Eaton's blogpost mentions many moth taxa on whose caterpillars these female wasps lay their eggs.