18 DIDELPHYS. 



BATTY'S OPOSSUM. 



Type locality. Coiba Island, West Coast of Panama. 



Genl. Char. Similar to D. m. caucce, but face dark with white, 

 spots about the supraorbital and malar tufts of bristles. 



Color. Like D. m. caucce. 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. caucce, 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. 



jtiarsupialis etensis (Didelphis!}, Allen, Bull. Am. Mus. Nat. Hist., 



1902, p. 262. 

 carcinophaga caucce, Bangs, Amer. Nat., xxxv, 1901, p. 633. 



(nee Allen.) 

 ETEX 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. caucce, 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: totallength, 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. 



