NEOTOMA. 287 



on chin, center of breast, and a line down through the center of the 

 abdomen to anal region, which have the hairs white to the roots; tail 

 dusky above, whitish beneath; ears pale brown. 



Measurements. Total length, 335; tail vertebra?, 158; hind foot, 

 34; ear, 34. Skull: occipito-nasal length, 41; Hensel, 34; zygomatic 

 breadth, 21; interorbital constriction, 5; width of braincase at root 

 of zygomata, 18; posterior width, 14; palatal arch to alveoli of 

 incisors, 19; postpalatal length, 15; median length of nasals, 15; 

 posterior width of nasals, 2.5; anterior width of nasals, 4.5; palatal 

 arch to hamular processes of pterygoids, 7 ; width of basioccipital 

 anteriorly, 8; length of upper molar series, 7; length of mandible, 

 angle to alveolus of incisor, 23; height at condyle, n; at coronoid 

 process, 12.5; length of lower molar series, 8. 



291a. *picta (Neotoma), Goldman, Proc. Biol. Soc. Wash., xvn, 



1904, p. 79. 

 PAINTED WOOD RAT. 



Type locality. Chilpancingo, State of Guerrero, Mexico. 



Genl. Char. Size medium; tail long, slender. 



Color. Upper parts orange rufous, sprinkled with black on head 

 and back; beneath white, plumbeous under fur showing; axillae 

 orange rufous; tail above dusky, beneath paler; hands yellowish 

 white; feet dusky; toes white; ears dusky. 



Measurements. Total length, 368; tail vertebrae, 180; hind foot, 



37. Skull: greatest length, 43.3; Hensel, 35; zygomatic width, 23; 

 interorbital constriction, 5; length of nasals, 17.4; palatal length, 

 8.6; length of upper molar series, alveolar border, 8.7. 



291b. isthmica (Neotoma), Goldman, Proc. Biol. Soc. Wash., xvn, 



1904, p. 80. 

 ISTHMIAN WOOD RAT. 



Type locality. Tehuantepec, State of Oaxaca, Mexico. 



Genl. Char. Size large; tail long, stout; ears medium. 



Color. Above between orange rufous and ferrugineous ; outer side 

 of forearms and hind legs grayish fulvous; top of head and back 

 sprinkled with black; under parts and inner sides of arms and legs 

 soiled white; tail above brownish, beneath paler; hands white; feet 

 dusky; toes white. 



Measurements. Total length, 395; tail vertebrae, 198; hind foot, 



38. Skull: greatest length, 48.4; Hensel, 38.4; zygomatic breadth, 

 23.7 ; interorbital constriction, 6.2 ; length of nasals, 19; palatal length, 

 8.3; upper molar series, alveolar border, 9. 



*Descriptions of the four following Wood Rats were published too late to 

 be included in the regular numerical order. 



