Elsewhere (Scudder, 1957a), I have outlined briefly a revised interpretation of some basal structures in the insect ovipositor. It was shown that in insects other than the Machilidae, the female genitalia has a common plan, this plan differing from that usually taken as the basic type. Whilst Snodgrass (1933) based his interpretations of all the higher orders on the condition in Machilidae, I have shown that a more satisfactory interpretation is obtained if the condition in the tepismidae is taken as the basic tvpe.