18 DIDELPHYS. 
Batty’s Oposstum. 
Type locality. Coiba Island, West Coast of Panama. 
Genl. Char. Similar to D. m. cauce, but face dark with white 
spots about the supraorbital and malar tufts of bristles. 
Color. Like D. m. cauce. Face dark, spotted with white; tail 
white for less than half the length, the basal fifth being like the 
body; rest of pelage like that of D. m. cauce, but without light 
dorsal bristles. 
Measurements. Head and body, 430; tail, 390; hind foot, 57, to 
end of claws, 63; ear, 50 (skin). Skull: greatest median length, 108; 
basal length, 100; greatest breadth, 52.5; length of three upper 
molariform teeth, 18.4. 
marsupialis etensis (Didelphis!), Allen, Bull. Am. Mus. Nat. Bast) 
TOO2,) Pr 202. 
carcinophaga cauce, Bangs, Amer. Nat., XxXxv, Igo, p. 633. 
(nec Allen.) 
ETEN Opossum. 
Type locality. Eten, Piura, Peru. Altitude, 50 feet. 
Geogr. Distr. Low coast belt of Ecuador and Peru, bordering the 
Gulf of Guayaquil and probably northward near the coast to Chiriqui, 
Panama; San Miguel Island, Bay of Panama. 
Color. Similar to D. m. cauce, but larger and blacker. Rostral 
region to the eyes, dingy brownish white, hairs tipped with blackish; 
whitish streak over ears meeting in front; middle of head from eyes 
posteriorly blackish; orbital ring blackish; ears and feet black; tail 
black for basal third; remainder yellowish white. 
Measurements. Total length, 730-930; tail, 330-450; hind foot, 
56-67; ear, 52-60; Skull: total length, 102-122; basal length, 92-118; 
nasals, 45-57.5; zygomatic breadth, 58-64; postorbital breadth, 23-28; 
postorbital constriction, 11-12; occipital breadth, 31-35.5; breadth 
at canines, 19-25; length of upper tooth row, 34.5—-36; length of 
molar series, 19-20. 
