78 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 



lowermost extremity of the ninth tergum, to which the first valvifer 

 is attached, as it is in most other insects. The eighth tergum has a 

 small paratergal sclerite {B,C, pt) enclosing the eighth spiracle, which 

 is extended ventrally (C) in a narrow sclerotic band on the anterior 

 lip of the intersegmental fold (g). 



The two valvulae of each side belonging to the ninth segment (fig. 

 24 D, 2VI, 3VI) arise from a common base {2Vlf) representing the 

 second valvifer. A small extension (/) of the valvifer apparently cor- 

 responds with the base of the posterior dorsal arm of the second valvi- 

 fer in Grylliis (fig. ly G, H, i), since it gives attachment to a muscle 

 from the ventral plate {c) of the ninth tergum. The large accessory 

 glands of Blatta open medially on the ninth venter between the second 

 valvifers (fig. 24 C, D, AcGlO). 



iVl 



/ Mil LB 



vniT 



Fig. 25. — Young female nymph of Blatta oricntalis with styH on ninth segment. 



A, ventral view of terminal part of abdomen. 



B, eighth and ninth segments exposed from below by removal of seventh ster- 

 num, showing styli (S'fy) borne on basal plates (IX LB) of gonopods of ninth 

 segment. 



The close correspondence in fundamental structure between the ovi- 

 positors of Blatta and Grylliis, notwithstanding the great differences 

 in size and form of the parts, scarcely needs to be pointed out. Walker 

 (1919) has shown that the ovipositor of the Blattidae is developed in 

 the usual manner from lobes of the eighth and ninth somites. It is 

 particularly interesting to observe that the basal plates of the second 

 gonopods in the female nymph bear small but distinct styli (fig. 25, 

 Sty) which, though lost in the adult female, correspond with the 

 styli of the male borne on the definitive sternal plate of the ninth 

 segment. 



The female genitalia of the termites, as described by Crampton 

 (1920, 1923, 1929), appear to be the same as those of the Blattidae, 

 except that the parts are more simple in form. In a female soldier of 

 Mastotermes darwinensis, Crampton (1920) shows a small subgenital 

 lobe of the seventh sternum underlapping the median part of the eighth 

 sternum, beyond which is the ninth sternum bearing a pair of lobes 



