210 Proceedings of the Biolog iced Societal of Washington. 
nj)pv^r iDolar, li.8, 11.6; leiigtli of mandible, 189, 152; lower tooth row, 
62 (with milk preinolars), 59.5 (with permanent premolars). 
SpecAmens Talamanea, Costa Kica, 5 skins and 4 sknlls; 
La Palma, Costa Rica, 1 sknll; Guatemala, 4 skins and sknlls. 
Remarks. The IMiddle American brocket is more widely difi'erent from 
the Panama form than it is from the Mexican race. The yonng in spotted 
coat are particularly brighter red. There are, apparentlj'^, no characters 
to separate it from M. tema tema other than tliose of color. In some 
specimens of cerasma the hair is reversed in a line along the neck from 
the withers to crown; in others there is Jio indication of this character, 
which seems to be of little or no value in differentiating forms of these 
small deer. 
Cyclopes mexicanus sp. nov. 
Type from Tehuantepec, Oaxaca, Mexico. Skin and sknll of adult, 
U. 8. National IMuseum. Collected by Dr. Speer. 
C/terraefens.—Differs from Cyclopes dorsalis Gray and from all other 
forms of the genus in its clear ochraceous-yellow coloration ; very little or 
no clouding from darker hair tips; underfur a much lighter tint of brown 
than in the related forms. 
Color of type. —General color above and below ochraceous pale-orange- 
yellow', most intense and golden on head, shoulders, and ^Yithers which 
are decidedly glossy. A narrow, wavy line of brown from withers to 
lower back and a fainter brown line below from breast to belly; hair tips 
otherwise entirely unmarked. Underfur of forward parts of hack mummy- 
brown ; of lower back, sides, and underparts very pale brownish-drab; of 
tail not distinctly darker than tips. 
Two specimens, from Tabasco and southern \era Cruz, show slight 
marbling from darker hair tii)S on upper body. 
Skull.—kioi differing from skulls of C. dorsalis except that in a series 
of seven specimens the audital bulke are uniformly larger, especially 
much broader, than in skulls of the (Middle American species. 
Measurements of type, from well made dry skin: Total length. 448 
millimeters; tail, 242. Skull of type: Greatest length, 45.8; condylohasal 
length,45.7; interorhital breadth, 9.6; breadth of braincase, 28.5; length 
of mandibular ramus, 29.7. 
Specimens examined, 7, from Chiapas,* Oaxaca, Tabasco,* and extreme 
southern Vera Cruz.* 
/?rmar7-s.—Compared with a series of six specimens of Cyclopes dorsalis 
from Middle America (Costa Rica, Honduras, and (Tuatemala) the series 
of Mexican Cyclopes is markedly different in coloration. There is no 
evidence of other than extreme constancy in color in specimens from the 
same region. The INfiddle American form is a very much darker golden- 
brown and is heavily marbled witli darker hair tips, as in C. didactylus. 
It is, however, easily distinguishable from the South American species by 
its less grayish, more golden-yellow ground color, especially of the arms, 
legs and tail. 
* biological Survey Collection. 
