NO. 4 FLEA GENUS PEROMYSCOPSYLLA — JOHNSON AND TRAUB I3 



Figs. 11-23. — Subspecies of Pcromyscopsylla: 11, Preantermal area of head, 

 P. hesperomys pacifica, ? ; 12, same, P. h. ravalliensis, $ ; 13, same, P. h. pacifica, 

 S; 14, same, P. h. ravalliensis, c?; 15, eighth sternum, P. h. hesperomys, <S ; 16, 

 same, P. h. pacifica, J'; 17, immovable process and digitoid of male clasper, 

 P. h. pacifica; 18-20, same, P. h. ravalliensis; 21, dorsal portion of male mesono- 

 tum, P. h. ravalliensis; 22, same, P. h. adelpha; 23, same, P. hamifer vigens. 

 For explanation of symbols see pages 67-68. 



