PEROGNATHUS. 357 



toid side of parietal not longest; audital bullae separated anteriorly 

 by full width or nearly full width of basisphenoid." 



KEY TO THE SPECIES AND SUBSPECIES OF THE SUBGENUS. 



A. Rump without bristles. PAGE 



a. Size small; total length, 136 mm. 



a/ Above buffy drab and black P. p. arenarius 358 



b. Size medium; total length, 159-191 mm. 

 a.' Above vinaceous buff and black. 



a." Hind foot, 24.4 mm P. p. angustirostris 358 



b." Hind foot, 23 mm P. p. pricii 358 



b/ Above whitish drab, tinged with fawn. . .P. p. crcmicus 359 



c/ Above hair brown P. pcrnix 359 



d.' Above broccoli brown P. p. restrains 359 



e.' Above mixed dark buff and black P. helleri 360 



c. Size large; total length, 208-242 mm. 



a.' Above cinnamon and brownish black P. hispidus 360 



b/ Above olive brown P. h. zacatecas 361 



c.' Above yellowish brown and black P. h. paradoxus 361 



d/ Above drab brown and black P. baileyi 361 



e.' Above pale buff and black P. b. rhydinohris 362 



f/ Above ochraceous buff and black P. cnecus 362 



B. Rump with bristles, 

 a. Size large. 



a.' Pelage very coarse, bristly, 

 a." Mastoids very small. 



a.'" Above pale fawn and black P. margarita 363 



b." Mastoids moderate. 



a/" Above dark gray, lined with black. 



a."" Tail 104 mm P. spinatus 363 



b."" Tail 101 mm P. s. peninsula 363 



c/"' Tail 127 mm P. s. bryanti 364 



b/ Pelage moderately coarse, not bristly. 



a.." Above drab gray, lined with black. . .P. intcrmedius 364 



b." Above hair brown P. nclsoni 364 



c." Above drab gray P. n. cancscens 365 



d." Above broccoli brown and black. 



a/" Rump bristles prominent P. goldmani 365 



b/" Rump bristles undeveloped P. g. artus 365 



e." Above dark grizzled yellowish brown 



and black P. fallax 366 



i" Above pale broccoli brown, slightly 



mixed with black P. /. pallidus 366 



