766 MONOGRAPHS OF NORTH AMERICAN RODENTIA. 
SCIURUS GERRARDL Gray. 
Gerrard’s Squirrel. = 
Seiurus gerrurdi Gray, Proc. Zool. Soc. Lond. 1861, 92, pl. xiv (New Granada). 
Macrocus gerrardi GRAY, Ann. and Mag. Nat. Hist. 3d ser. xx, 1867, 430. 
Macrorus brunneo-niger CASTELNAU, MS.—Gray, Ann. and Mag. Nat. Hist. 3d ser. xx, 1867, 429 (Brazil). 
Macrorus xanthotus Gray, Ann. and Mag. Nat. Hist. 3d ser. xx, 1867, 429 (Costa Rica). 
? Macroxus ignitus GRay, Ann. and Mag. Nat. Hist. 3d ser. xx, 1867, 429 (Bolivia). 
Speciric cHars.—Intermediate in size between Sciurus variabilis and 
Sciurus estuans var. rufoniger. Length of body from end of nose to base of tail 
about 9.50; of tail-vertebrae about 8.00; of tail to end of hairs about.10.00 to 
10.50; of hindfoot about 2.25. Top of the head and middle region of dorsal 
surface black or dusky; rest of dorsal surface varied with yellowish-rufous and 
black; below, deep reddish-brown or bright reddish-orange ; outer side of the 
limbs sometimes like the ventral surface, sometimes like the dorsal surface ; 
in some specimens, dark fiery red-brown, darker than the ventral surface. -'Tail 
rather full and bushy, the base of the hairs yellowish-brown, with narrow 
rings of black; a broad subterminal black bar, broadly tipped with reddish- 
golden, varying to dark fiery-red. Pelage short and sparse, especially below. 
To this species I refer three badly prepared skins from Nereua, New 
Granada, and four specimens in alcohol from near Obispo, Panama, two of 
which are evidently not of adult size. The three Nercua specimens vary in 
color below from dark reddish-orange to dark reddish-brown. In two, the 
middle of the back is black, the rest of the dorsal surface being varied with 
yellowish-rufous and black, the former color prevailing. The hairs individu- 
ally are dusky at the base, with a broad subterminal yellowish-rufous bar, 
and tipped with black. In one of the specimens, the black band along the 
middle of the back is narrow and not well defined. In one, the whole upper 
surface of the head, including the sides of the nose, is nearly as dark as the 
middle of the back; in the others, the head is varied with yellow and black. 
Tn one, the surface of the tail is reddish-golden; in another, red; and in the third, 
dark cherry-red. Of the Panama specimens, one (No. 3224, adult male) is 
deep red above, blackish on the occiput and rump, and pale red below, with 
the tail black at the base and tip, and the middle half red. Another (No. 
3644, a young female) is dusky above, varied with reddish-yellow, and 
bright ferrugineous below, with the tail black, the middle half broadly edged 
with red. No. 3216 (also an immature female) is similar to the last, but is 
