METACHIRUS. DIDELPHYS. 13 
ALLEN’S Opossum. TJlacuazin in Guatemala. 
Type locality. Unknown. 
Geogr. Distr. Southern Mexico to Costa Rica. 
Genl. Char. Size medium; tail longer than head and body; ears 
large. 
Color. Above blackish washed with gray; top of head and 
median line black; flanks gray; under parts yellowish white; a band 
above and a broader one below ears, and spots above eyes, yellowish 
white; outer surface of limbs paler than sides of body; inner surface 
yellowish white; tail dark brown at base, grading into light brown or 
flesh color at tip, heavily furred at base, remainder naked; feet 
brownish, naked; ears flesh color broadly edged with dark brown. 
Measurements. Total length, 534; tail, 283;-hind foot and claws, 
39. Skull: basal length, 62; nasals, 32; canine to posterior edge of 
last molar, 25.5; palatal length, 38; zygomatic breadth, 32; mastoid 
breadth, 19; interorbital constriction, 8.5. (Type.) 
a.—pallidus (Metachirus), Allen, Bull. Am. Mus. Nat. Hist., 1901, 
Pp. 215. 
OrIZABA Opossum. 
Type locality. Orizaba, State of Vera Cruz, Mexico. 
Geogr. Distr. States of Vera Cruz, Puebla, and Tabasco, south- 
eastern Mexico. 
Genl. Char. Similar to M. fuscogriseus, but lighter; orbital spots 
larger. 
Color. Head black above with two large spots above eyes, and a 
brownish white stripe on each side of nose; rest of upper parts black- 
ish gray, darkest on dorsal line; side of body gray, paler than back; 
side of head, throat, hands, feet, and entire under parts yellowish 
white; tail at base furred like the back; naked portion black for two- 
thirds the length, spotted with flesh color, remaining part all flesh 
color. 
Measurements. Total length, 475-627; tail, 240-315; tarsus, 
38-47. Skull: total length, 77; basal length, 69; length of nasals, 37; 
zygomatic width, 39; across postorbital processes, 14.3; interorbital 
constriction, 9; mastoid width, 25; palatal length, 42; length of upper 
molar series, 15. (ex Type.) 
5. Didelphys. 
55. QI-1. p 3-3. i 
it Ge Lapeer: lee = 56, 
4-4? ‘i =8 
J. A. Allen. A Preliminary study of the North American Opos- 
sums of the genus Didelphis!, Bull. Am. Mus. Nat. Hist., rg01, p. 149. 
