40  Fretp Museum or Natural History — Zoétoey, Vor. X. 
interorbital breadth 5.6; breadth of braincase 12.8; postpalatal length 
12.2; three anterior molariform teeth 6.2. 
Remarks. The area of hairs with dark bases seems to be quite as 
extensive in this form as in M. mitis. Therefore it seems scarcely pos- 
sible that it is the same as M. m. casta in which this area is said to be 
greatly reduced. 
The single specimen was brought to us by a boy who killed it with 
a stick as it ran from an overturned corn shock. Considerable trapping 
was done in the same field but none of this species was caught. 
Myrmecophaga tridactyla artatus subsp.nov. Venezuelan Ant-bear. 
Type (skull only) from Empalado Savannas, 30 miles east of Mara- 
caibo, Venezuela. Adult. Collected March 1911 by W. H. Osgood. 
Characters. Differs from M. tridactyla and M. t. centralis in its 
much narrower nasals and less expanded maxillaries, making the 
entire rostral part of the skull decidedly narrower; anterior lateral 
extensions of frontals less produced than in centralis but more so than 
in tridactyla; greatest depth of maxillary much less than in ¢tridactyla; 
antero-inferior production of parietal considerably exposed on ventral 
surface of skull as in centralis. 
Measurements of skull. Greatest length 346 (344);* length of nasals 
(median) 148.7 (150), (diagonal) 177 (178); greatest width of nasals 
16 (19.6); least width of nasals 10 (14.2); greatest width of rostrum 22.3 
(28.2); least width of rostrum 19.8 (24.3); greatest depth of maxillary 
20.3 (20); least interorbital width 42.2 (45); median length of frontals 
144.2 (140); mastoid width 54.4 (55.7); lacrymal 38.5 x 17.5 (31 x 18). 
Remarks. This form seems well distinguished from both M. tridac- 
tyla of Brazil and M. t. centralis of Central America, the characters of 
which have been so clearly pointed out by Lyon (Proc. U.S. Nat. Mus., 
XXXI, pp. 569-571, pl. XIV, 1906). It is somewhat nearer centralis, 
agreeing with that form in the character of the antero-inferior part of 
the parietal and in the relatively shallow maxilla. In the relations of 
the anterior productions of the frontals it is somewhat intermediate. 
A specimen from Dibulla, Colombia, loaned by the Museum of Comp- 
parative Zoology, evidently is referable to the new form although less 
pronounced in its characters than the type; while one from Ciudad 
Bolivar, Venezuela, belonging to the American Museum of Natural 
History, is quite as definitely referable to the Brazilian form. 
Material is not as yet available to determine what external charac- 
* Measurements in parentheses are those of an adult skull of centralis (No. 15066) from Guatemala, 
