598 



SAXD FLEAS FBOM RHODE ISLAND— JUDD. 



VOL. xvin. 



The hairs on the peduncle of the superior antenna are arranged in 

 bristle-like tufts in the male only. There is a collection of long hairs 

 near the base of the tlagelluni in the male, but none in the female. 



In the female the greater part of the hairs occur on the ventral side^ 

 while in the male the greater number are on the dorsal side. The 



Fig. 6. 



ISYBLIS SERRATA, Male. 



inferior anteniue of the male, like the superior ones, possess tufts of 

 hairs on the ])cdunrle; in the female these are wanting. In the male 

 the third joint of the ]>eduncle is swolh'n. and thus su])ports a larger 

 number of tufts of hairs. 



The tlagellum of the inferior antenna is 

 greatly elongated in the male. This pecul- 

 iarity as well as the increased number of olfac- 

 tory tufts may be connected with the functions 

 of the male in seeking the female. 



The acute teeth on the ventral margin of the 

 coxic of the female are represented in the male 

 l)y blunt cones. 



In the male the last three segments of the 

 pleon are so constricted at the articulation wiih 

 the preceding segment of the pereion as to allow 

 great freedom of motion to the terminal part of 

 the body, and this may be of service in copula- 

 tion. In this sex, too, the inner ramus of the 

 last appendage bears, in addition to the rows of spines found on both 

 rami of iho, female, long hairs. (See Fig. 8 c). These hairs probably 

 aid in the union of the sexes. In both sexes the opposing edges of the 

 rami are serrated; but they extend to the tip of the ramus in the male 



BYBLIS SEHU.\TA. Female. 



First .iml SKComl maxilla? of left side, \ 

 tro-K^ter.il stirface. 



