i6 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I23 



Figs. 24-37. — Subspecies of Peromyscopsylla hcsperomys: 24,0-0, Seventh 

 sternum, P. h. pacifica, 2 ; 25,0-/1, same, P. h. adclpha, ? ; 26,a-c, same, P. h. 

 hespcromys, ?; 27,a,b, same, P. h. ravallicnsis, allotype c^; 28,0—/, same, P. h. 

 ravalliensis, $; 29—31, immovable process and digitoid of male clasper, P. h. 

 adelpha; 32, same, P. hespcromys (intergrade), Crook County, Wyo. ; 33, same, 

 P. hesperoinys (intergrade), Pennington County, S. Dak.; 34,0,6, eighth sternum, 

 P. h. adelpha, S; 35,a,b, seventh sternum, P. hespcromys (intergrade), ?, Crook 

 County, Wyo.; 36, same, P. hcsperomys (intergrade), $, Pennington County, 

 S. Dak. ; 37, genal area showing three spines, P. h. hcsperomys, $, Tennessee. 

 For explanation of symbols see pages 67-68. 



