1908.] Allen, Mammals from Nicaragua. 653 



buttocks dusky gray or blackish; outer surface of fore limbs gray; upper surface 

 of fore and hind feet whitish; ventral surface and inside of limbs pure white; no 

 fulvous lateral line; tail nearly naked, bicolor, blackish above, whitish below; ears. 

 nearly naked, dusky, with a barely perceptible edging of white; soles of hind feet 

 naked, brownish black, 6-tuberculate. 



Total length (type), 300 mm.; tail, 150; hind foot, 30 (collector's measurements). 

 Three specimens (2 tf, 1 9 ) measure, total length 293 (280-300); tail, 153 (150- 

 160). Skull, occipitonasal length, 36.3; condylo-basal length, 32; zygomatic 

 breadth, 15.7; interorbital breadth, 10; mastoid breadth, 15.5; length of nasals, 

 10; width of rostrum above base of incisors, 5; upper molar series, 4.5. 



This species agrees in size and proportions with H. repens Bangs, from 

 Panama, except in having smaller feet, but differs from it greatly in colora- 

 tion, being much darker, while the suffusion of the upper parts is much 

 paler buff instead of tawny. The skull differs in the less posterior ex- 

 tension of the nasals, which terminate slightly in front of the posterior border 

 of the premaxillse instead of extending decidedly beyond them. 



This species is based on 4 specimens, the type, from Tuma, a second 

 specimen from Chontales, and two from Matagalpa. All are adult, but the 

 Chontales specimen is a little younger than the others, and a little smaller 

 and darker. 



21 . Neotoma chrysomelas sp. nov. 



Type, No. 28372, 9 ad., Matagalpa, Nicaragua, Sept. 17, 1907; W. B. Richard- 

 son. 



Sides of body, from nose to thighs, golden brown; dorsal region, from top of 

 head to base of tail, similar but heavily overlaid by black-tipped hairs, rendering 

 the dorsal area blackish; ventral surface white, with the basal half of the pelage 

 dusky, usually showing more or less at the surface along the lateral borders and 

 inside of hind limbs; fore and hind limbs passing into dusky apically; fore feet 

 abruptly silvery white; hind feet whitish, mottled with dusky, sometimes the white, 

 sometimes the dusky prevailing; ears large, dark brown, the apical two-thirds 

 nearly naked; tail heavily haired, wholly concealing the annulations, blackish above, 

 grayish white below. 



Total length (collector's measurements), 380 mm.; tail vertebrae, 170; hind 

 foot (from dry skin), 36. Skull, total length, 47; condylo-basal length, 45; zygo- 

 matic breadth, 25; length of nasals, 19. Four specimens (3 c?, 1 9), all adult, 

 measure as follows: Total length, 375 (340-390); tail vertebrae, 160 (150-170). 

 Skull, total length, 45.9 (45-47); zygomatic breadth, 24.7 (24-25); nasals, 18.2 

 (17.8-19). All the specimens were taken at the type locality. 



Neotoma chrysomelas is a member of the N. ferruginea group, to which 

 also belong X. pi eta and N. isthmica, and perhaps other ferruginous forms 

 of southern Mexico. It differs from N. ferruginea Tomes, its nearest geo- 

 graphical ally (type locality, Duenas, Guatemala), in larger size, relatively 

 broader skull, and longer nasals (skull of N. ferruginea, total length, 45, 



