38 Annals Entomological Society of America [Vol. XV, 



In Anisomorpha buprestoides (Figs. 72, 73) the genitalia 

 form a shorter mass, which is sunk into a pocket formed by 

 the enclosing hypandrium. There is practically no fissure 

 dividing it into right and left halves, the two parts of which 

 it is composed being evidently primarily dorsal and ventral 

 (dpi, vpl), though actually placed so obliquely that the dorsal 

 part is dorso-dextral, the ventral part ventro-sinistral. The 

 greater part of the genitalia is flexible with unchitinized walls, 

 but the dorsal surface is considerably chitinized and this 

 sclerite plainly corresponds to the dorsal plate of Diapheromera. 

 It has a prominent sinistral angle which represents the sinistral 

 cornu of Diapheromera, and there is a somewhat thickened 

 longitudinal part which seems to represent the primitively 

 median dorsal region. The opening of the ejaculatory duct is 

 well to the right, but lies in a wholly membranous area, there 

 being no clasper like that of Diapheromera. 



Since the present study was made Chopard ('20) has pub- 

 lished descriptions and figures of the genitalia of a number of 

 Phasmids, many of which are much more complex and more 

 suggestive of the Blattids than the forms described above. He 

 recognizes in their typical composition four genital valves, 

 of which the two superior sometimes (e. g., Anisomorpha) 

 unite to form a single dorsal plate, while the two inferior valves 

 may unite to form a single ventral plate. The genitalia are 

 extremely variable, being in some cases wholly mem.branous, in 

 other cases very strongly sclerified, while in still others they 

 are partly membranous with many separate plates and pro- 

 cesses, very suggestive of the Blattids. 



The genitalia of the Phasmoidea thus resemble those of the 

 Grylloblattoidea, Mantoidea and Blattoidea (with exceptions 

 in certain details) in that they appear to consist prim.arily of 

 right and left lobes (or pairs of lobes), asymmetrical in size, 

 form and position, partly membranous and partty chitinized, 

 with the opening of the ejaculatory duct lying between them 

 and not borne upon a conspicuous penis. In the two forms 

 described here the opening of the ejaculatory duct is directed 

 somewhat dextrad, as in the other groups mentioned, and in 

 Diapheromera there is a dextral clasper with an internal 

 apophysis, a feature also somewhat common in the Blattoidea 

 and Mantoidea. 



