1894.] NATURAL SCIENCES OF PHILADELPHIA. 265 



Perognathus longimembris panamintinus siibsp. nov. (Fig. 4). 



Type from Perognathus Flat, Panamint Mts., Califoraia. No. 

 ■!9.HM' ^' yS- ^^-f ^- ^- ^^f- Museum, Department of Agriculture 

 Collection. Collected April 16, 1891, by Vernon Bailey. (Original 

 number 2,675.) 



Measi()rmenfs(ta.ken'm^es\\).— Tiipe: Total length, 152 mm; tail 

 vertebrtt, 83 ; hind foot, 20. Ear from anterior base 7 (in dry skin). 

 Average measurements of 29 specimens from type locality: Total 

 length, 143; tail vertebra-, 78; hind foot, 19-8. 



General characters. — Size small ; pelage silky ; tail long, de- 

 cidedly longer than head and body; skull long and slender, particu- 

 larly the rostrum. Compared with lonc/iwembrls the ground color 

 of the upper parts is paler (pale buffy ochraceous 

 instead of pale fulvous), but the upper parts as a 

 whole are darker from the more liberal admixture 

 of black- tipped hairs; the ears are smaller, the hind 

 feet longer, the tail much longer and better haired; 

 the pelage longer and more silky. 



Color. — Ground color of upper parts pale ochra- 

 ceous-buff, everywhere (except on lower sides) ob- 

 scured by black tipped hairs; under parts and feet 

 white; tail incompletely bicolor : dull ochraceous 

 below, dark above. Sometimes the proximal half 

 is concolored all around, the distal half only being dark above. 



Oranial characters. — Skull similar to that of longimembris in 

 general characters, but much longer and more slender, particu- 

 larly the rosti'al part. Tiie pentagonal interparietal is broader 

 transversely than in longimembris, and the audital bullse meet 

 anteriorly in a symphysis. 



Perognathus flavus mexicanus snbsp. uov. (Fig 5). 



Type from Tlalpam, Valley of Mexico (Federal District.) No. 

 50,714, yg. ad., U. S. Nat. Museum, Department of Agriculture 

 Collection. Collected December 4, 1892, by E. W. Nelson. 

 (Original number 3,978.) 



Measareiiumts (taken in Hesh). — Type: Total length, 118 mm; tail 

 vertebrae, 55; hind foot, 17-5. Ear from anterior base 6 (in dry 

 skin). Average measurements of 12 specimens from type locality: 

 Total length, 116; tail vertebrte, 53-7, hind foot, 17-4. 



. 4. r. iiaua- 

 inintinns. 



