50 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 94 



In the last nymphal stage of the cricket, as illustrated in Gryllus 

 (fig. 21 G), the valvifers appear as weak sclerotizations in the areas 

 previously membranous laterad of the bases of the valvulae. The 



H '^"; : I ~r K 



Fig. 21. — Development of the ovipositor of Gryllidae and Tettigoniidae. 



A, ventral view of end of abdomen of very young nymph of Nemobuis. B, 

 seventh and eighth sterna of Nemobius at later stage. C, ninth and postgenital 

 segments of same. D, end of abdomen and ovipositor of young nymph of 

 Ncoconocephalus. E, late instar nymph of Nemobius. F, same, lower part of 

 ninth segment and valvulae. G, lower parts of genital segments with base of 

 ovipositor of last nymphal instar of GryHtis, showing origin of first valvifer in 

 podial area of eighth segment. H, base of ovipositor of adult Gryllus assimilis. 

 I, same of Orocharis saltator. J, same of Neoxabia bipiinctata. K, same of 

 Cyrfoxipha coluinbiaiia. 



first valvifer (iVlf) lies in the ample membrane of the eighth seg- 

 ment behind the small eighth sternum. Ventrally it is connected with 

 the base of the first valvula (iVl), and posteriorly it is prolonged as 

 a prominent lobe (y) inserted between the base of the third valvula 

 and the lateral sclerite (x) of the ninth segment, which latter is now 



