No. 416.) MAMMALS IN SAN MIGUEL ISLAND. 639 
being wholly of an intense ferruginous color from nape to tail, 
others having the rump only ferruginous, the rest of back 
being darkened by a copious sprinkling of black-tipped hairs ; 
chin dull grayish-white ; rest of under parts varying from 
strong buff to clear ferruginous, some examples having both 
colors irregularly distributed in patches; upper surfaces of 
hands and feet yellowish-brown ; nails white; tail colored like 
the body for a short distance, then black, sometimes yellowish- 
white at tip, thickly clothed with stiff hairs, which, however, 
do not hide the scales (except at base, where the tail is colored 
like the body) ; ears blackish, small and low, nearly naked except 
for the long black whisker-like hairs that surmount their edges. 
Skull: Compared with the figures of that of Z. caniceps, 
the skull of Z. /abilis is much more slender, with narrower 
palatal and post-palatal regions; viewed in profile it is much 
flatter, with the supraorbital ridge lying flat and straight and 
not rising in a curve. 
MEASUREMENTS. 
Yun maw: | Sex Dirk |. Torar | "TArL HiND EAR FROM 
| s | LENGTH. ratte Foor. NoTcnu. 
| i 
8480, type | & adult | April 26 | 540 | 240 47 15 
8468, topotype gf “ ‘ 540 220 48 15 
8471, * 5 ue “ 26 540 220 47 15 
8470, * pa 4 “26 535 2 48 16 
8469, “ Le ^ " 26| $30 210 48 15 
MIL ^4 D? « e 500 240 45 15 
8474  * | IC * 23| 470 220 47 15 
8472, oe | g s "* 198 470 230 45 16 
8475  * | d young; “ 2 440 215 45 14 
MS. o. | 2 o! May 4 420 175 42 15 
8476  “ | i * sg 420 195 42 14 
Skull, type, adult 4, basal length, 47.8; occipito-nasal length, 
56.6; zygomatic width, 27.4; mastoid width, 22.4 ; least inter- 
orbital width, 12; length of nasals, 16; width of nasals, 7.2; 
length of palate, to palatal notch, 21.2; to end of pterygoid, 
36.4; upper tooth row, 13; length of single half of mandible, 
34 ; lower tooth row, 13.2.! 
! Some skulls that appear to be of about the same age are smaller, others larger. 
