64 



NORTH AMERICAN FAUNA. 



[No. 36. 



Characters. — Smilar to tenuis^ but smaller; colors brighter and more 

 intensely ocliraceous. 



Color. — Adults: Upperparts varying from deep ochraceous-buff to 

 pinkish cinnamon, mixed on top of head and back with black; under- 

 parts suffused (sometimes heavily) with pinkish buff; ears dusky 

 hair-brown; tail dark hair-brown or fuscous above, grayish white 

 below; fore feet pale buff; hind feet soiled whitish. Young: Colors 

 less intensely ochraceous; underparts whiter. 



Slcull. — Similar to that of tenuis, but smaller; zygomata more 

 contracted anteriorly. 



Measurements. — Type: Total length, 173; tail vertebrae, 95; hind 

 foot, 19. Average of 5 from type locality: 166; 92; 19.2. Skull: 

 (See table, p. 81). 



Remarlcs. — This subspecies is a small, bright-colored form occupjdng 

 the coast plain of Colima and perhaps of adjacent States. Specimens 

 from San Sebastian and Etzatlan, Jalisco, are intermediate between 

 this form and tenuis, but seem to be nearer to the latter. A single 

 specimen from Acaponeta, Tepic, is very small, and clearly referable 

 to nelsoni, although on geographical grounds it might be expected to 

 be tenuis. 



Specimens examined. — Total number, 8, from the following localities 

 in Mexico : 



Colima: Colima, 7. 

 Tepic: Acaponeta, 1. 



REITHRODONTOMYS FULVESCENS MUSTELINUS subsp. nov. 

 Buff-bellied Harvest Mouse, 



Type from Llano Grande, Oaxaca, Mexico. No. 71549, U. S. Nat. 

 Mus., Biological Survey Collection, 9 adult, February 18, 1895; 

 E. W. Nelson and E. A. Goldman. Original No. 7483. 



Distribution. — Coast region of Oaxaca and Guerrero. 



Characters, — Similar to helvolus but colors darker and richer; un- 

 derparts buffy. 



Color. — Upperparts varying from ochraceous-salmon to rich pinkish 

 cinnamon, heavily mixed on head and back with black; underparts 

 strongly suffused with pinkish buff; ears hair-brown; tail fuscous 

 above, whitish beneath; fore feet buffy white; hind feet grayish 

 white. 



SlcuU. — Similar in size and proportions to that of helvolus; nasals 

 longer, narrowed to a point posteriorly; palatal foramina short, not 

 reaching plane of molars; bullae small. 



Measurements. — Type: Total length, 184; tail vertebrae, 105; hind 

 foot, 20. Adult from Chilpancmgo, Guerrero: 198; 110; 20. Skull: 

 (See table, p. 81). 



