PEROGNATHUS. 353 
Fic. 67. PEROGNATHUS MERRIAMI. 
No. 4963 Field Columbian Mus, Ci [wice nat. size 
A. Perognathus. 
Mastoids well developed, extending beyond occipital line; inter- 
] 
parietal pentagonal; mastoid side of parietal longest; audital bulle 
nearly contiguous below basisphenoid. 
KEY TO THE SPECIES AND SUBSPECIES OF THE SUBGENUS. 
A. Size small: hind foot less than 18 mm 
a. Tail about 60 mm. PAGE 
a.’ Above ochraceous and black. P. merriamt 353 
b.’ Above pale fulvous or buff and black. 
a.’’ Hind foot, 15 mm : a Teele HICUUS a GA 
b.* Hind foot; 77 mm. ov arl. f. MEXICONUS 355 
er bite Foot, 7A IN ss = a ...P. p. brevinasus 355 
c.’ Above pale ochraceous drab and black....P. pacificus 355 
B. Size large; hind foot over 18 mm..........P. a. melanotis 356 
359. merriami (Perognathus), Allen, Bull. Am. Mus. Nat. Hist., 
1892, p. 45, pl. 11, figs. 1-6. Elliot, Syn. N. Am. Mamm., 
IQOI, P. 243. 
mearnst Allen, Bull. Am. Mus. Nat. Hist., 1896, p. 237. 
