96 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



with the lower ends of the eighth tergum (figs. 31 A, 32 A). The 

 spiracles of the eighth segment (VIIISp) lie in these folds behind 

 the lower ends of the eighth tergum. The first valvifers (fig. 31 A, 

 iVlf) are entirely detached from the eighth sternum and are closely 

 associated with the ninth tergum. 



The ninth segment forms the large conical, apical part of the ab- 

 domen (fig. 30 A). The tergum (IXT) ends posteriorly in a median 

 triangular rostrum projecting above the proctiger (Ptgr), which is 



VlllStn ^ iVlf 2Vlf j\ 



iVlf 



Fig. 31. — Ovipositor of Magicicada scptcndecim. 



A, genital segments and ovipositor, with seventh sternum pulled forward ex- 

 posing genital opening (a) leading into pouchlike genital chamber {GC). 



B, parts of ovipositor separated. 



C, tip of ovipositor, ventral. 



D, section of ovipositor. 



mostly retracted into the rear end of the ninth segment. Between the 

 ventral edges of the ninth tergum is a deep concavity in which is con- 

 cealed most of the ovipositor and the membranous ventral region of 

 the ninth segment. The latter contains a median sclerotization with 

 strong transverse corrugations lying between the second valvifers. 

 The basal parts of the latter {sVlf) are exposed below the anterior 

 ventral angles of the ninth tergum. 



The ovipositor is strongly developed. It consists of two pairs of 

 valvulae (fig. 31 A, iVl, 2VI), which are the first and second gona- 



