30 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I23 



Figs. 64-68. — Subspecies of Peromyscopsylla silvatica: 64, Immovable process 

 and digitoid of male clasper, P. s. spcctabilis; 65, same, P. s. silvatica; 66, eighth 

 sternum, P. s. spcctabilis, <$ ; 67, seventh sternum, spermatheca, and bursa copula- 

 trix, P. s. silvatica, 9 ; 68, immovable process and digitoid of male clasper, P. s. 

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



