15 



(compare fig.320). A more or less extensive anterior part of the subgenital plate is thus 

 concealed by the posterior part of sternite 8 from ventrally and can be regarded as a broad 

 apodeme or internal apophysis. The paired parts which project especially deeply anteriad 

 (S9a in fig.321b,d,k) are the lateral sternal apodemes or apophyses; these paired parts will 

 be designated as the apophyses of the subgenital plate subsequently. The summits of what 

 I call apophyses can reasonably be regarded as homologous in the various species though 

 they can take various positions from far lateral (like in fig.265) to far medial (like in 

 fig. 22). However, strict homology is certainly not true for the whole apophyses (= paired 

 parts): The apophyses can be separated from each other to the far posterior (like in fig.265), 

 the paired parts being very long, or the whole median part of the subgenital plate is 

 produced far anteriad and only the anteriormost parts show the paired condition (like in 

 fig. 296). The apophyses present in the latter situation seem to correspond only to the 

 anteriormost parts of the apophyses present in the former situation, and probably some 

 median fusion has taken place in the posterior part. Hence, the term "apophysis" as used 

 here is not intended to claim strict homology. 



According to Walker (1922) and other authors, the subgenital plate is not the sternite of 

 segment 9 only but is probably composed of: (1) the true sternite 9 (the part anterior to 

 M); (2) the paired but medially fused coxites of segment 9 - probably serially homologous 

 with the thoracic coxae or with more extensive basal parts of the thoracic appendages. If 

 this composition is true, the subgenital plate is a coxosternite. The styli S9s sitting upon 

 the coxites are probably serially homologous with distal parts of the thoracic legs. 

 The tergite of segment 9 (T9 in fig.320, 321a) resembles the more anterior tergites, but 

 like tergite 8 it is rather short. Its lateral parts (= paratergites, T9p in fig. 32 lb) incline 

 ventrad from the dorsal main part - often along a distinct edge. The ventral margins of 

 the paratergites overlap in most cases, and to a varied extent, the lateral parts of S9. 



The position of the phallomere complex 



The intersternal membrane between sternites 9 and 10 is deeply invaginated anteriad to 

 form the walls of the funnel-shaped genital pouch: The ventral wall of this pouch extends 

 anteriad from the lateral and posterior edges of the subgenital plate (Vw in fig. 32 Ik, left 

 half, fig.320). The dorsal wall extends anteriad from the anterior margins of the paraprocts 

 Pp and Pv-sclerites (Dw in fig.320, 321b). The lateral walls extend anteriad from the 

 posterior edge of the pleural membrane between tergite 9 and subgenital plate (Sw in 

 fig.32Ib,d). 



Deep in the genital pouch the cuticle turns posteriad again and forms the walls of the 

 phallomere complex. The edge or line of turning, along which the walls of the genital 

 pouch meet the walls of the phallomere complex, will be called the basal Une (Bl in 

 fig.320, 321b,d). Hence, the phallomere complex seems to be exclusively an elaboration 

 of the intersternal area between sternites 9 and 10. The ejaculatory duct (D in 

 fig.321b,d,e,g) opens on the phallomere complex. 



In many Blattaria and Mantodea, the ventral wall of the genital pouch (Vw in fig.320, 

 321k), which covers the posterior part of the subgenital plate from dorsally, contains a 

 sclerotisation (S9d in fig.320, 321b,d,k). S9d is regarded as a dorsal sclerotisation of the 



