1915.] Allen, Review of the South American Sciuride. 231 
the throat brighter, passing into the bright orange-colored pectoral region; 
tail grizzled pale buffy gray and black, both above and below, the tips of 
the hairs reddish orange giving a strong superficial wash of red, including 
the tip. 
Total length (6 adults from Trinidad, collector’s measurements), 376 
(367-390); head and body, 203 (197-208); tail vertebrae, 174 (162-192); 
hind foot (ec. u.), 47 (45-48). A series of 9 skins from Cristobal Colon, 
Venezuela, collected and measured by Leo E. Miller: total length, 383 
(360-405); head and body, 191 (173-200); tail vertebrae; 195 (180-215); 
hind foot (c. u:), 47.6. A series of 6 specimens (in Br. Mus.) from Ipuré, 
Cumana, collected and measured by E. André: total length, 377 (371- 
381); head and body, 200 (192-206); tail vertebrae, 177 (173-180); hind 
foot (s. u.), 46 (44-48). 
Skull (4 adults, Trinidad), total length, 49 (48-50); zygomatic breadth, 
29 (28-30); interorbital breadth, 16 (15.5-16.5); breadth of braincase, 
21.9 (21.5-22); length of nasals, 15 (14.5-15.5); diastema, 12 (12-12); 
maxillary toothrow, 8 (8-8). Seven adult skulls from Cristobal Colon, 
Venezuela, total length, 49.2 (48-51); zygomatic breadth, 29 (28-30); 
interorbital breadth, 16.3 (15.5-17.5); breadth of braincase, 22.3 (21.5—-23); 
length of nasals, 14.6 (14-15); disatema 12 (11.7-12.5); maxillary tooth- 
row, 8.2 (8-8.5). 
Specimens examined, 35.—Island of Trinidad, 9: Princestown, 7; 
Caparo, 1 (type); Carenage, 1 (all Am. Mus.).—.Venezuela, 22: 1 (Br. 
Mus.); Cristobal Colon, 15 (Am. Mus.); Quebrada Secca, 3, type and 
topotypes of Sciwrus quebradensis (Am. Mus.); Guanta, 1 (Nat. Mus.); 
Ipuré, Cumana, 6 (Br. Mus.). 
Remarks.— Microsciurus chapmani bears a general resemblance to 
Guerlinguetus estuans, but is larger, with a relatively much shorter tail; 
upperparts yellowish olivaceous instead of reddish brown; ventral surface 
paler and chin buffy instead of grayish. It has no close resemblance to M. 
griseogena, its near neighbor in western Venezuela. 
My Sciurus quebradensis, from the northern coast of Venezuela, does not, 
in the light of present material, seem to require nomenclatural recognition. 
The large series from the Paria Peninsula does not differ materially from 
Trinidad specimens, averaging perhaps slightly paler. The type and topo- 
types of quebradensis, from near Cumuné, are so nearly like the Paria Penin- 
sula specimens as not to require separation. A single specimen from Guanta 
(No. 63213, Nat. Mus.), an immature female, is aberrant in the intense 
orange-rufous of the whole ventral surface and in the stronger suffusion of 
the fore limbs with rufous. | 
