262 Bulletin American Museum of Natural History. [Vol. XVI, 



dingy yellowish white, strongly washed with blackish; ventral sur- 

 face buffy white, washed, often strongly, with blackish. Size and 

 proportions about as in colombica, except that the ears are much 

 larger. 



Measurements. Two adult males from the type locality measure, 

 respectively: Total length, 770 and 740 mm.; head and body, 410 

 and 370; tail, 360 and 370; hind foot, 53 and 58. A female from 

 the same locality measures: Total length, 740; head and body, 370; 

 tail, 370; hind foot, 58. Skull : 4 adult male skulls from Cali 

 measure as follows: Total length, 102.5 (94~ I0 7)J basal length, 90.3 

 (85-99); nasals, 45 (42-50); zygomatic breadth, 52 (48.5-57); post- 

 orbital breadth, 20.5 (19-21); postorbital constriction, n (10-12); 

 occipital breadth, 29.1 (2831); breadth at canines, 19 (1621); upper 

 toothrow, 35 (34-36); molar series, 19.6 (19-20). 



Specimens examined: 



Colombia: 17 specimens, mostly immature, from Cali, Upper 

 Cauca Valley; coll. Amer. Museum. 



This subspecies is represented by 17 specimens, all from 

 the vicinity of Cali, Cauca Valley, Colombia, of which 1 1 are 

 adult and 6 immature. The immature specimens have the 

 ears either wholly flesh-color (in the very young) or parti- 

 colored, black at base and tipped more or less broadly with 

 flesh-color, according to age. Unfortunately only a few of 

 the specimens were measured in the flesh. The adults are 

 mostly in the black phase, five being wholly black, two mostly 

 black, and four gray; of the young, three are black and three 

 gray. 



Didelphis marsupialis etensis, subsp. nov. 



? Didelphis karkinophaga cauccs BANGS, Amer. Nat. XXXV, 1901, 

 633. San Miguel Island, Panama. 



Type, No. 18986 (formerly No. 0-3-1-86, Br. Mus.), S ad., Eten, 

 Piura, Peru (alt. 50 feet), Oct. 2, 1899; coll. P. O. Simons, No. 628. 



Geographical Distribution. The low coast-belt of Ecuador and 

 Peru, bordering the Gulf of Guayaquil, and probably northward, near 

 the coast, to Panama. 



Similar in general coloration to D. m. cauccs, but larger and blacker. 

 In fresh pelage the rostral region, as far back as the eyes, is dingy 

 brownish white, the hairs being tipped with blackish; a whitish streak 

 over each eye, the two meeting in front of the eyes; cheeks dingy 

 whitish; middle of the head, from between the eyes posteriorly, 

 blackish, the pelage whitish basally with long black tips; a blackish 



