Mammals from British Guiana. 147 
17. Scturus Quelchii, sp. n. 
Three skins. 240 to 800 feet. November and December. 
An olive-coloured species, with a yellow belly and four pairs 
of mamme. 
General appearance very similar to S. cusc’nus and Ingram, 
more olive and less brownish than in the true S. estuans, 
Chapmant, and quebradensis. Fur fairly short, though 
slightly longer than in S. @stwans, about 8 millim. in length 
on the back. General colour above finely grizzled olive, this 
colour extending over the whole of the upper surface, on the 
head, and on the outer sides of the limbs, but the hands and 
feet are more yellowish, especially on the toes. Under 
surface and inner sides of limbs buffy yellow, the chest nearly 
pure “cream-buff,” though the hairs are slaty basally through- 
out. Lines of demarcation not sharply defined. ars of 
medium length, their fine thinly-scattered hairs fulvous, but 
these are too fine and too few to give any general fulvous 
effect. No postauricular patches. Tail mixed black and 
fulvous, the hairs mostly with three black rings and the tips 
broadly fulvous ; hairs at the end of the tail more entirely 
black, but still with their extreme tips fulvous. Four pairs 
of mamme, the most anterior close behind the axille. 
Skull with short abruptly and squarely truncated nasals, 
not nearly reaching to the back of the premaxillary processes. 
Postorbital processes short. Molars unusually small. 
Dimensions of the type (measured in the flesh) :— 
Head and body 178 millim.; tail 165; hind foot, s. u. 44, 
c.u. 475; ear 20. 
Skull: greatest length 45; basilar length 34; greatest 
breadth 27°5; nasals 10°5x6:2; interorbital breadth 16; 
breadth across postorbital processes 22; diastema 11°5; 
palate length from henselion 18°5 ; length of palatal foramina 
2°7, of upper tooth series 6:8. 
Type. Male. No. 1. 6. 4. 66. Collected November 2, 
1900. 
This squirrel is unexpectedly different from the true 
S. estuans of Surinam and the Guianan coast-lands. Hxamples 
from Demerara and Cayenne, however, representing that 
form, are clearly different from the present, thew darker 
colour, slenderer form, shorter fur, and especially the deep 
orange-buffy of their underparts readily separating them from 
the species found inland. Shaw’s “ Myoawws guerlingus”’ 
aud Peters’s “ Sciurus estuans, var. guianensis’’ *, are botn 
* MB. Ak. Berl. 18638, p. 655, 
