]38 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv. 
The adult and two of the 3^oung possess long black hairs scantily 
overlying the under-fur. One of the young has these black hairs 
replaced by white, and in another most of the black hairs are so 
replaced. The tail is eminently prehensile. Measurements of the 
adult female: Length, 700; tail, 350; hind foot, 50. 
2. CALUROMYS PHILANDER (Linnaeus). 
WOOLLY OPOSSUM. 
Local name: Comadreja, a misnomer, as tJtervord is Spanish for weasel. 
1888. Didelphys philander Thomas, Gat. Marsupialia and Monotremata, Brit. Mus., 
p. 337. 
1894. Didelphys {Philandfr) philander Thomas, Ami. Mag. Nat. Hist., 6tli ser., 
XIII, p. 439. 
1900. Calnromys 2Mlander Allen, Bull. Amer. Mus. Nat. Hist., XIII, p. 189. 
One adult female and three ,young collected by Captain Robinson 
at San Julian. The tail is uniformly brown in color, as in O. trimtatis 
(Thomas) instead of having the terminal portion white, which is said 
to be typical of specimens from Guiana. Its skull measures a trifle 
less than that of the female given by Mr. Thomas in his Catalogue 
of the Marsupialia. In the following measurements the figures in 
parentheses are those given by Mr. Thomas. Skull: Basal length, 44 
(48); greatest breadth, 28.5 (31); nasals, length, 20 (21.5); maximum 
breadth, 7 (6.8); minimum breadth, 3.5 (3.3); postorbital processes, 
tip to tip, 15.5 (16); intertemporal constriction, 9.8 (9.5); palate, 
length, 25 (28); breadth outside m\ 15 (16.5); inside m\ 10.5 (11.5); 
length molars 1-3, 7 (8). 
Dimensions of female collected at San Julian, August 1: Length, 
517; tail, 307; hind foot, 38. 
One is struck at once by the difl'erence in aspect between this and 
the common opossum; its rounded head, much- more rounded than is 
usually represented in cuts; its large, mild, yellowish-brown eyes, so 
different from the beady black eyes of the other species; its woolly fur 
with no coarse hair, and its very long and slender prehensile tail. 
The young cling to their mothers' wool by their tails, mouths, hands, 
and feet, and the strength of their grasp is remarkable. The pouch 
of the female is lined with orange-brown hair and. contains six rather 
prominent mamma\ 
3. PERAMYS BREVICAUDATUS (Erxleben). 
SHORT-TAILED PIGMY OPOSSUM. 
Local name: Raton Casiragua. 
1888. Didelphys hrevicandata Thomas, Cat. Marsupialia and Monotremata, Brit. Mus., 
p. 356. 
Only one specimen of this interesting little animal was secured, a 
young female trapped at San Julian on August 7. It was taken in a 
thicket of vines near a stream, in a cyclone trap baited with rolled oats. 
Its tail is not prehensile. The specimen was identified by Mr. Oldfield 
Thomas. It measures as follows: Length, 144; tail, 55; hind foot, 17. 
