Ovipositor — Male Organs 79 



various abdominal appendages being represented 

 thus : — 



VIII. Anterior gonapophyses. 

 IX. Stylets (outer posterior gonapophyses repre- 

 senting lateral outgrowths of sternite.) 

 X. Inner posterior gonapophyses. 

 XI. Cercopods. 



Since the inner hind gonapophyses arise in the cock- 

 roach behind the ninth sternite, it is conceivable that 

 they may really belong to the tenth segment (5l)« 

 But in all other insects in which the organs have been 

 studied, both 

 inner and outer 

 hind pairs seem 

 to belong un- 

 doubtedly to the 

 ninth. It is 

 most likely, 

 therefore, that 

 while the stylets 



and cercopods ^^g. 54. — Hind-body of female Cicad showing ovi- 



,. , positor. a. from beneath ; fi. from side : c. from 



represent limbs, above. From Marlatt, Bull. 14 (n.s.) Div. Ent. 



the processes of U.S. Dept. Agr. 



the ovipositor should be regarded as specially modified 

 outgrowths of the skin rather than as true appendages 

 of the segments to which they belong (59 a). 



Male Reproductive Organs. — The sperm-cells 

 are developed in the genital glands or testes of the 

 male ; in the Cockroach these organs lie in the fat- 

 body, beneath the fifth and sixth abdominal tergites. 

 Each testis consists of thirty to forty rounded chambers 

 opening into a slender tube (vas deferens), about a 

 quarter of an inch long, which leads into a sperm 

 vesicle {veskula seminalis) (fig. ^6). The chambers of 

 the testis are lined with a folded layer of cells {sper- 



