NO. 4 FLEA GENUS PEROMYSCOPSYLLA — JOHNSON AND TRAUB 25 



or movable finger of clasper (F.) twice as long as broad at maximum, 

 with area of greatest width near apex ; apex rounded, this area bearing 

 three long bristles on posterior margin; below these, margin slightly 

 concave to subrounded posteroventral angle; anterior margin quite 



Figs. 53-58. — Peromyscopsylla selenis: 53, Eighth sternum, c?; 54, preanten- 

 nal area showing three genal teeth, c^, Plumas County, Calif. ; 55, normal pre- 

 antennal area, c?; 56, seventh sternum, spermatheca, and bursa copulatrix, $; 

 57, distal arm of ninth sternum, c? ; 58, immovable process and digitoid of male 

 clasper. For explanation of symbols see pages 67-68. 



straight, bearing two or three long thin bristles. Distal arm of ninth 

 sternum (fig. 42) with dorsal (anterior) margin proximally semi- 

 membranous; with convex posterior (ventral) margins; apex sub- 

 acute ; posterior margin with many marginal and submarginal bristles, 

 three of these very stout, and longer than others. 



