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 



