A Comparative Study of the Appendages of the Eighth and Ninth Abdominal Segments of Insects

Abstract

This is a preliminary paper intended to establish the interordinal homologies of the genital appendages of insects more accurately and with greater certainty than has been possible in the past Much additional work on the subject is desirable in practically all of the orders of insects. While this paper was intended primarily as a study of the male gemtalia, it has been found necessary to consider first the structures of the ovipositor of female insects. Here the homologies appear to be relatively easily understood, and with the exception of one or two points, most authors agree in their interpretation of them Except where it seems advisable to use other names, the terminology employed by Snodgrass (1935) has been followed in this paper.