DIDELPHYS. 17 
auriia (Didelphys), Alston, Biol. Centr. Amer. Mamm., 1, 1881, 
p- 197. (nec Wied.) 
RicHMOND’s Opossum. Zorro in Costa Rica. 
Type locality. Greytown, Nicaragua. 
Geogr. Distr. Nicaragua and Costa Rica. 
Genl. Char. Base of under fur orange buff; tail long. Skull: 
long, narrow; nasals long. 
Color. Sides of head to base of ears pale buffy white; median 
stripe black; black band from ear to whiskers; cheeks buffy white; 
nape and shoulders black; the long hairs black on anterior part of 
body, white on posterior part; under fur with black tip, then yellow- 
ish white, and orange buff at base; under parts buffy, base of hair 
brownish yellow; legs, hands, and feet black, nails yellowish white; 
tail black on basal half, remainder flesh color; ears black. 
Measurements. Total length, 948; tail, 477; tarsus, 70. Skull: 
total length, 114; nasals, 54; zygomatic width, 55; across postorbital 
processes, 25; interorbital constriction, 11.5; mastoid breadth, 32.5; 
palatal length, 65; length of upper molar series, 37.4. 
marsupialis insularis (Didelphis!), Allen, Bull. Amer. Mus. Nat. 
Pist,, 1902, Pp. 250. 
IsLAND Opossum. 
Type locality. Caparo, Island of Trinidad. 
Geogr. Distr. Islands of Dominica, Grenada, and St. Vincent, 
West Indies. Trinidad. 
Genl. Char. Lighter in color than true D. mesamericana, and 
larger in size. 
Color. Head yellowish white to nape, orbital ring brownish; long 
hairs of top of head tipped with dusky; under fur yellowish white, 
the coarser hair tipped with blackish; at base over nape and shoulders 
brownish ochraceous; long stiff overhair wholly white, or wholly 
black, or mixed black and white, evidently an individual peculiarity. 
Under parts yellow or yellowish white, tips of some hairs blackish; 
arms from elbows and legs from knees, blackish brown; tail naked, 
proximal third blackish brown, apical two-thirds flesh color or 
whitish; ears blackish brown. 
Measurements. Total length, 810-955; tail, 425-465; hind foot, 
55-66; ear, 55-65. Skull: total length, 1ror—11o; basal length, 91-101; 
zygomatic breadth, 61-63.5; postorbital breadth, 21-24; occipital 
breadth, 30-32; length of nasals, 47-50; breadth at canines, 19-20; 
upper tooth row, 33-36. 
marsupialis battyi (Didelphis!), Thomas, Novitat. Zoél., 1x, 1902, 
P- 137- 
