39 2 Bulletin American Museum, of Natural History. [Vol. XX,. 



Tamandua tetradactyla chapadensis, subsp. nov. 

 Fig- 2, p. 390. 



Myrmecophaga bivittata COPE, Amer. Nat., XXIII, Feb., 1889, 132. 

 Chapada specimens. (Separates dated May 25, 1889.) 



Myrmecophaga Isellata COPE, ibid., p. 133 (the Chapada specimen 

 only) . 



Tamandua tetradactyla THOMAS, Proc. Zool. Soc. London, 1903, II,. 

 242 (April i, 1904). 



Type, No. 369, ? ad., skull, Chapada, Matto Grogso, Brazil, July, 

 1885; coll. Herbert H. Smith. Cotype, No. 1417, skin, same locality 

 and collector. 



Size medium ; nasals short ; frontals prolonged anteriorly ; occipital 

 condyles extending considerably beyond the occipital plane. Oc- 

 cipito-nasal length, 125; basal length (without premaxillaries) , 127;. 

 greatest breadth at front edge of orbits, 37; width of braincase, 42; 

 length of nasals, 42.5 (equal to width of braincase). (For further 

 skull measurements see table, p. 398; for comparison with allied 

 forms see p. 396.) 



Light areas ochraceous buff; shoulder bands as usual in the group; 

 dark area of body reaching to base of tail; light dorsal stripe extending 

 to posterior third of dark area; hairs of dark area very long, light 

 buffy ash for basal half and tipped (many of them) with the same 

 color, mixed with many wholly black, giving a grizzled grayish black 

 general effect. 



The pelage is much longer, coarser, and heavier, and the light band 

 at the base of the hairs several times broader than in any of the Santa 

 Marta specimens. Unfortunately external measurements are lacking, I 

 but apparently it is a short-tailed form, like the Santa Marta animal, in 

 comparison with the Mexican and Panama forms. 



Cope distinguished his M. bivittata straminea as being' 

 straw-color, with two black bands on the shoulders and a 

 black patch on the abdomen. As the locality is in doubt, and 

 no cranial characters were given, it must remain at present 

 indeterminable. The common form, here named chapadensis, 

 of which he had several specimens (part of the series here 

 under consideration), he distinguished as M. bivittata Desm. 

 (=r tetradactyla Linn.). 



Tamandua tetradactyla instabilis, subsp. nov. 



Fig- i, P- 39- 



Tamandua tetradactyla SCLATER, Proc. Zool. Soc. London, 1871, 

 546, pi., xliii (colored figure of a Santa Marta specimen). 



1 It is to be regretted that Mr. Thomas failed to publish the flesh measurements of 

 the large series of Chapada specimens collected for the British Museum by Mr. A. 

 Robert (Cf. Proc. Zool. Soc., 1903, II, p. 242). Such measurements are always of the 

 greatest value to subsequent investigators* 



