1895. 



PEOCEEDINGS OF THE NATIONAL MUSEUM. 553 



T)h. Ear shorter than hind foot ; tail longer than in the preceding section ; skull 



stouter, higher, and heavier, with postorhital 

 process united with the cranium behind, 

 c. Ear shorter than head. 



d. Skull high, size small; tail very short; hind foot short and scantily 

 clothed ; ear small. Length, 370 mm. ; tail ver- 

 tehrie,50; ear above crown, 70; hind foot, 82. 



bachmaiii. 

 (Id. Skull not so high; size larger; tail, ears, and hind feet larger, the 

 latter heavily coated with long hair, 

 e. Skull lightly ossified, Avith audital bulla> much mtlated, mandible 

 small, dentition weak, and rostral portion of 

 skull abbreviated; nasals falling consider- 

 ably short of the premaxillaries; ears heavily 

 coated with long hair; color dark. Length, 

 425 mm. ; tail vertebra^, 58 ; ear above crown, 



64 ; hind foot, 105 lyinetis. 



ec. Skull and dentition heavier; audital bnlhe small, mandible large; 

 nasals and rostral portion of skull elongated, 

 the former exceeding the premaxillaries; ears 

 less heavily clothed with short hair ; coloration 

 light. Length, 415 mm. ; tail vertebra-, 67; ear 

 above crown, 80; hind foot, 100. 



liolzneri (p. 554). 



cc. Ear longer than head. 



/. Skull low and narrow, with rostral portion elongated ; audital bulho 

 moderately iuilated, shorter antero-posteriorly 

 than the upper molar series; "size large; ears 

 broadly tipped with black ; color of upper sur- 

 face tawny olive, mixed with gray and black. 

 Length, 400 mm. ; tail vertebrae, 67 ; ear above 



crown, 90 ; hind foot, 92 audiihoni. 



ff. Skull higher and broader, with rostral portion reduced; audital 

 bulhe much inflated, longer antero-posteriorly 

 than the upper tooth-row; size small; ears 

 narrowly tipped with black; color of upper 

 surface pale yellowish brown, mixed with gray 

 and black. 

 y. Size large; coloration dark. Length, 380 mm. ; tail vertebra^ 55; 

 ear from crown, 85 ; hind foot, 92. 



major (p. 557). 

 g<j. Size small; coloration light. 



/(. Larger; ears and tail relatively long. Length, 360 mm.; tail 

 vertebra-, 60; ear above crown, 85; hind foot, 



g2 arizona'. 



hh. Smaller; ears and tail relatively short; skull with rostral por- 

 tion, mandible, and audital bulla- relatively 

 more developed. Length, 330 mm.; tail ver- 

 tebras, 50; ear above crown, 80; hind foot, 



80 minor (p. .557). 



AA. Interparietal only present in the fetus, and for a very short period after birth; 



always fused with the parietals in adults, and 

 usually developed from two ossific centers. 

 Ear longer than hind foot, 

 i. Convex surface of ear w-hite at the apex ; black patch on middle 

 of rump tending to become obsolete. 



