74 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



Other hand, the epiproct is retained and forms the terminal plate of 

 the abdomen. 



The tergum of the seventh segment (fig. 24 A, JUT) does not dif- 

 fer from the terga preceding it. The seventh sternum {VI IS), how- 



dd VlIIStrL D 



AcGlO 



Fig. 24. — The genital segments and the ovipositor of Blafta oriciitalis. 



A, end of abdomen, showing large valvular lobes of seventh sternum conceal- 

 ing vestibulum, ventral parts of eighth segment, genital chamber, and ovipositor. 



B, genital and postgenital segments detached, showing eighth sternum as 

 small fold beneath entrance to genital chamber (GC) into which opens the 

 oviduct (Od) and spermathecal ducts (SptD). 



C, ventral view of ovipositor and associated parts : floor of genital chamber 

 containing gonopore (Gpr) turned forward along line x-.r, exposing sternal 

 sclerites (a, b) of eighth segment; spermathecal pore {Spr) in median plate 

 (d) of roof of genital chamber, flanked by two lateral plates (c, c) ; opening of 

 accessory glands (AcGlO) in venter of ninth segment between second valvifers 

 (cf. fig. 23). 



D, ventral view of parts of ovipositor belonging to ninth segment. 



a, b, sclerites of eighth sternum in floor of genital chamber associated with 

 gonopore ; c, d, secondary sclerites in dorsal wall of genital chamber associated 

 with spermathecal pore; e, ventral part of ninth tergum; /, lobe of second 

 valvifer ; g, intersegmental groove between ventral ends of eighth and ninth 

 terga ; x-x, line across anterior extremity of genital chamber on which floor of 

 genital chamber is turned forward (C). 



ever, is highly modified and specially developed. It consists of a basal, 

 semiannular plate resembling the preceding sterna, and of two large, 

 oval, distal, lateroventral, valvelike lobes (VIISL) forming a hood- 

 like cap concealing the ovipositor. The median ventral edges of these 



