ALLEN: MAMMALIA. 217 
Skull with well-developed ridges, zygomata slightly bowed, palate normal with 
a slight median convexity at the posterior edge. Last upper molar with six 
salient angles, the posterior enamel space somewhat Y-shaped. 
Color: — Dorsal surface of the head and back a general dark rusty, between 
russet and cinnamon of Ridgway. This is produced by a mixture of entirely 
blackish hairs with others whose bases are slaty black with narrow tips of bright 
tawny approaching orange-rufous. Under a lens, many of these latter hairs 
are seen to have a minute dark tip. Towards the sides of the head and body 
the bright-tipped hairs predominate producing a nearly clear tawny ochraceous. 
A small dark patch in front of each thigh, about 10 mm. in vertical height by 
5 mm. in length is of a slate-gray. Ears prominent and thinly clothed with 
short hairs nearly Prout’s brown in color. 
Lips, ventral surface of the throat and limbs nearly gray No. 6 of Ridgway, 
becoming whiter on the ventral surface of the body on account of the whitish 
tips to the hairs which conceal the slaty bases. Upper surfaces of the feet 
covered with short pale gray hairs. Tail bicolor, Prout’s brown above, grayish 
below, with a distinct pencil about 4 mm. long. 
Five other specimens agree with the type in color except that one or two 
have a faint buffy tinge to the gray hairs of the belly. All five are females and 
do not show the spot on the hip that covers the lateral gland in the male. _ 
Skull:— The skull has the general appearance of that of an Evotomys, 
short and rather delicate but the postorbital ridges of the squamosal are more 
prominent, the zygomata are slightly expanded, and the second upper and third 
lower molar are distinctly encapsuled. The palate is normal but instead of end- 
ing in a straight-edged shelf posteriorly, has a slight median convexity. The 
palatal grooves are distinct but shallow from each of the incisive foramina, and 
end in the usual perforation close to the posterior palatal margin. In all the 
skulls this perforation is completely bridged by the bony palate. The ptery- 
goids are nearly parallel distally and their hamular processes abut each against 
the antero-internal end of the audital bulla. The diastema is practically as 
long as the alveolar length of the molar row. 
The teeth (Figs. E, F) show less complexity in the enamel pattern than those 
of the Evotomys available for comparison, and there seems less tendency for 
the triangles to be open. The first upper molar has the usual five spaces, all 
closed, and three salient angles on each side, the internal more rounded than the 
external. The second upper molar has four closed spaces as usual with three 
external and two internal angles. The third upper molar resembles that of 
Evotomys (‘Phaulomys”) smithi in its simplicity and approach to bilateral 
