332 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
General Characters.— Size large; tail as long as head and body, not 
tufted. Dark hairs prevailing dorsally; backs of hands and feet buff. 
Upper incisors grooved; pterygoids slightly expanded proximally, 
their bases extending forward anterior to the posterior median edge 
of the palate. 
Description. Top of head from nose to crown, nape, back, and 
dorsal surface of the tail a mixture of black and ochraceous buff, the 
former predominating. ‘The individual hairs are slaty for the basal 
two thirds, then either black-tipped or with a subapical ring of ochra- 
ceous buff and a black tip; on the sides of the muzzle, cheeks, sides of 
body, forearms, and hind legs the black-tipped hairs become largely 
suppressed giving a nearly clear ochraceous buff (Ridgway, 1886) 
tone to these parts. Metacarpal and metatarsal areas clear buff, toes 
white. The ears are clothed with minute blackish hairs externally, 
and sparsely covered internally with short pale buff hairs. The 
entire ventral surface of the head and body (including the upper lips) 
and the limbs are covered with hairs white to their bases. The tail 
is sharply marked off by its ochraceous buff color on its basal half be- 
low; the rest of the under surface is darkened with short black hairs 
which predominate towards the tip. The terminal hairs are slightly 
the longest but do not form a tuft. 
Skull.— The skull is that of a mature animal but the teeth are only 
slightly worn. In this condition the 
middle lamina of the first upper molar 
shows a slight central contraction mark- 
ing off an inner and an outer portion. 
The upper incisors show a well-marked 
groove nearer the outer side, thus differ- 
ing from the liodon group which this 
species equals in size. Anterior palatal 
foramina 3 mm. long, reaching from the 
level of the center of the first molar to 
the back of the second. Posterior pala- 
tal foramina reduced to two minute per- 
forations just posterior to the level of 
the last molars. The conformation of 
the pterygoids is different from that of 
Bs a) a ‘iS Gelade per et acps to which I have had access. 
Their bases are slightly divergent, and 
included within a notch in the palatal bones between the median 
projecting point and the posterolateral extensions, which are rather 
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