1915.] Allen, American Deer of the Genus Mazama. 039 
Three adult male skulls from Chapada, Matto Grosso, are similar in size and in 
other features, and are doubtless referable to this form. 
The general coloration of the upperparts is pale rufous, deepest on the 
back and paler on the sides and belly; the head and back of the neck are 
dusky brown. The skulls average about 25 mm. shorter than an adult 
female skull from Tumatumari, British Guiana, described above (M. 
americana tumatumart), and the coloration is everywhere much lighter; 
the limbs are colored like the body instead of being blackish as in the Guiana 
form. 
Mazama rufa jucunda Thomas. 
Mazama americana jucunda THomas, Ann. and Mag. Nat. Hist. (8), XI, p. 587, 
June, 1918. Roca Nova, Serra do Mar, Parana, Brazil (alt. 1000 m.). 
“Similar in general characters to-the ordinary M. americana of eastern South 
America (M. rufa auctorum), but the skull conspicuously shorter. Fur of medium 
length; nape hairs reversed (one skin only). Colour above of head and neck brown, 
of body bright rufous fawn, not very unlike that of M. zetta. Under surface, as usual 
in this group, whitish on chin and throat, rufous, like back, on belly. Limbs brown 
proximally, rufous on the digits. Tail dark rufous above, white below.” 
The type is an immature female, but measurements of an adult male skull are 
given, as follows: “‘Condylo-basal length 178 mm.; zygomatic breadth 88; length of 
nasals 45 [in the immature female 57]; interorbital breadth 46; gnathion to front of 
anterior premolar 55; palatal length 109; breadth between sides of m? 65; upper 
toothrow 61.’’ — Thomas, l. c. 
Closely related to typical rufa, but apparently rather smaller and some- 
what paler than specimens from Matto Grosso. 
Mazama sheila Zhomas. 
Mazama sheila Tuomas, Ann. and Mag. Nat. Hist. (8), XI, p. 587, June, 1913. 
Type locality, Montafia de Limones (altitude 50 m.), lowlands, near Merida, 
Venezuela. 
‘‘ A small pale rufous ally of M. americana. 
‘Size conspicuously smaller than in M. zetta. Form about as in that species. 
Fur close and short. Nape-hairs not reversed (in the single specimen). General 
colour bright rufous (between orange-rufous and tawny of Ridgway). Muzzle, 
centre of crown, and neck brown, supraorbital lines rufous, not sharply defined. 
Ears pale brown, with distinct patches of white at the base of their inner edges. 
Chin and interramia, a patch on chest, and anal region whitish; rest of under surface 
rufous, like back. Fore limbs rufous throughout. Hind limbs rufous, but the 
metatarsals brown, darker posteriorly. Tail rufous above, white below. 
“Skull of the same somewhat broad squat shape as in M. zetta, but far smaller. 
Premaxillee not quite reaching to the nasals. 
