July 10, 1914 
luol 
Vol. XXVII, pp. 141-144 
PROCEEDINGS 
OF TIIF 
BIOLOGICAL SOCIETY OF WASHINGTON 
DKSCPxIPTrONS OF FOUR NPJW ^lAMMALS FROM 
TROIRCAL AMFPvICA. 
BY Y. HOLLISTER. 
[Published by permission of the Secretary of the Smithsonian Institution.] 
The following new forms of Neotropical Mammals have been 
found in the collection of the United States National Museum. 
Ateles tricolor sp. nov. 
Ttjpe from Santa EHgenia, Oaxaca, iMexico. Adult 9 , skin and skull, 
U. S. National 3Iusemn, No. fffl. Collected January 14, 1S69, by 
F. Sumichrast. Orig. No. 42. 
General characters. —Difler.s from Ateles pan, of Guatemala, in having 
the upper hack and shoulders distinctly lighter, more lirownish, tlian 
head and nape; lower hack, rump, and flanks sharply yellowish-hnft’, 
not Itrown ; tail with stripe of yellowish-huff along under side for one- 
third to one-lialf its length: throat huffy, .not hlackish-hrown. Pelage 
much shorter, especially on shoulders and flanks. 
Color of U/pe-specimen. — Forehead, crown, and nape black; sides of 
head grayish, mixed huff and black hairs; long hairs of the forward part 
of back dark bister; lower hack, rump, flanks, and hips yellowish-huff, 
almost old-gold or clay-color in the richer marked areas along np))er 
flanks ami hips; chin thinly haired with huff and black; tliroat and 
entire underparts of body pale yellowish-bufl; upper arms brownish-black 
above, yellowish-Iniff below; forearms and hands black; outer side of 
legs dark yellowish-huff or clay-color below hips, blending through brown 
to clear black half way to knee; lower legs and feet black; inner sides of 
legs dark yellowish-liuff to near heel; tail dark hlackish-hrown above at 
base, becoming clear black at tip, with a stripe of yellowish-huff along 
under side from root to about one-third the length. 
Skull and teeth .—much like that of Ateles pan; middle upper 
incisor teeth distinctly larger. 
Measurements of tijpe, Irom well made dry skin.—Head and hod3’,-l-l0; 
tail, 710. Skull and teeth of type* (old adult 9 ) : Total length of skull, 
109; occipitonasal length, 9o.(); condylohasal length, SI.4; palatal length, 
32— Biol. Pkoc. Soc. W.xsh., Vol. XXVII, 1914. (Ill) 
