80 Merriam Four New Mammals from Mexico. 



some specimens blackish); stripe from side of nose passing over eye pale 

 buffy, sometimes washed with or bordered above by pale fulvous; short 

 band under eye (rarely reaching to ear) buffy; cheeks grizzled, washed 

 with fulvous; underparts buffy or yellowish buffy, sometimes becoming 

 fulvous on throat and chin; fore legs and feet and hind feet dull pale 

 fulvous, the fulvous, in the brown pelage, extending over thighs; sides 

 of neck washed with fulvous; tail coarsely grizzled black and buffy, 

 bordered on terminal half with subapical black band and edged with 

 buffy fulvous; median line of distal half of underside usually pale 

 fulvous. 



Cranial characters. Skull about the size of that of Citellus mexicanus 

 but frontal region very much broader, anterior upper premolar decidedly 

 smaller, and front of incisors intense chestnut instead of pale yellowish. 

 Compared with its nearest relative, C. annulatus, the skull is only about 

 three-fourths as large, rostrum fore-shortened, jugal broader, coronoid 

 and angular processes of jaw longer; the bullse are large, the frontal 

 shield broad, the postorbital processes long and strongly decurved. 



Measurements. Type ( 9 ad.): total length 350; tail vertebrae 156; 

 hind foot 48. Average of 10 specimens from type locality: total length 

 341.6; tail vertebrae 158.7; hind foot 46.9. 



Cranial measurements. Topotype ( $ ad.): basal length 41; palatal 

 length 24; postpalatal length 17; zygomatic breadth 26; interorbital 

 breadth 13; length of tooth row on alveolus 8.25; on crowns 7.5. 



Nelsonia gold man! sp. nov. 



Type from Mt. Tancitaro, Michoacan, Mexico. No. 125,818 $ ad., 

 U. S. National Museum, Biological Survey Collection. February 25, 

 1903. E. W. Nelson and E. A. Goldman. Original No. 16,021. 



Characters. Similar to Nelsonia neotomodon but darker and grayer 

 (much less fulvous), and with hind feet dusky instead of white. Tail 

 well haired toward and at tip, as in neotomodon. 



Color. Upperparts dark slate gray, lightly washed, especially on 

 sides, with pale ochraceous; underparts white, the plumbeous underfur 

 showing through. Tail dusky. above, becoming gradually paler beneath 

 not sharply bicolor as in N. neotomodon. Young dark slate color, very 

 different from the buffy grayish young of N. neotomodon. 



Cranial characters. Skull similar to that of N. neotomodon but more 

 angular; flatter between orbits and over front of braincase; anterior base 

 of zygoma with vertical lamella well marked, forming a spine when 

 viewed from above [absent in neotomodon]; nasals narrower; rostrum 

 more constricted at base by better defined antorbital fossa. 



Measurements. Average of 3 specimens from type locality: total 

 length 248; tail.vertebrse 122; hind foot 29. 



