202 Annals Entomological Society of America [Vol. XV, 



In the nymphs the sexes can be recognized in the second 

 instar and it is possible that in carefully prepared specimens 

 they could be recognized in the first instar. In the later 

 nymphal stages they are quite distinct. 



Between the eighth and tenth sternites there is an crea 

 the anterior portion of which we will call the genital area; 

 anterior to this is the eighth sternite, which is well defined; 

 posterior to it, and between it and the tenth, is an area which 

 may represent the ninth, or it may represent the conjunctiva 

 between the ninth and tenth, and the ninth may be rep- 

 resented in the genital area. From the genital area arises the 

 gonapophyses. 



In the female nymphs during the last instar the gon- 

 apophyses consist of three pair of subangular, fairly flat 

 processes reaching more than half way back to the tenth 

 sternite. The anterior pair (Fig. 1, gl) ariSe from the posterior 

 edge of eighth sternite, although at an earlier period their 

 connection with that sternite is not so apparent. The median 

 pair (Fig. 1, g2) are smaller and lie immediately posterior to gl, 

 and as they both point backward and gl are larger than g2, 

 therefore they lie beneath, or are covered up by gl. The 

 posterior pair (Fig. 1, g3) are larger and hold a more lateral 

 position and are concavo-convex. The genital opening or 

 gonopore is at the base of g2. 



In the adult female the eighth abdominal segment is short 

 but well defined. That the segment in question is the eighth 

 can be demonstrated by counting them, especially on the 

 dorsal aspect; the presence of the last, or eighth, spiracle also 

 indicates which segment it is. From the hind margin of the 

 eighth sternite arises two processes (Figs. 2, 3, gl), which 

 form the anterior or ventral process of the ovipositor. These 

 are long, thin and narrow and their outer basal angles are joined 

 to the aitter basal angles of the ninth tergite. The eighth sternite 

 overlaps their bases, but the membranous connection shows 

 the relationship to the posterior margin of that segment. 

 The ninth segment forms the pygofer (Fig. 2, pg), the tergite 

 being large, but the extent of the sternite obscure and depends 

 upon the composition of the genital area of the nymph. Two 

 sclerites (Fig. 2, bp) which appear to be the valvifers of 



