90 



Bangs A New Neotoma from Mexico. 



Characters. A very distinct species, with a wholly black tail as in 

 N. tenuicauda, but much larger than that animal, and differing from it 

 markedly in skull characters; much like N. fulviventer in color, except 

 the tail, which is bicolor in that species, but rather darker; much larger 

 than N. fulviventer and with a much larger and more massive skull; ros 

 trum and nasals longer; rostrum more swollen over roots of incisors; ant- 

 orbital fossa correspondingly more pronounced; zygomata more spreading 

 posteriorly (in N. fulviventer the sides are parallel); superciliary ridges 

 more elevated and more pinched in over orbits; incisors and molars much 

 larger and heavier. 



Color. General color of upperparts mummy brown, the back much 

 darkened by the thick sprinkling of brownish-black tipped hairs; sides 

 paler, more russet; sides of nose and upper lips dull grayish brown; chin, 

 upper throat and narrow belly stripe dull gray; a wide pectoral collar, 

 ochraceous-buff; lower middle belly and ventral region yellowish white; 

 feet and hands dull grayish brown; toes and fingers white; ears rather 

 small, nearly naked, dusky; tail unicolor, black; whiskers mixed black 

 arid colorless. 



Measurements. 



Skull, old adult $ , type: basal length, 43; occipito-nasal length, 48; 

 xygomatic width, 25; mastoid width, 19.4; interorbital width, 5.2; length 

 of nasals, 19; width of nasals, 5.6; length of palate to palatal notch, 22.2; 

 length of palatal slits, 10.6; length of upper molar series, 9.4; length of 

 single half of mandible, 29.6. 



