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JAN., 1912. MAmMats, VENEZUELA AND CoLomBia — OsGoop. 39 
Didelphis marsupialis colombica Allen. Colombian Opossum. 
One specimen, El Panorama, Rio Aurare, Jan. 21, 1911. 
Owing to its very large size, this specimen, an old male, seems 
clearly referable to D. m. colombica, if that be a valid form. In fact, 
our specimen exceeds the average size of the Santa Marta series forming 
the original basis of the name colombica and almost equals D. m. insul- 
aris of Trinidad, the largest of the forms of Didelphis marsupialis. 
Flesh measurements are: Total length 865; tail vertebra 435; hind 
foot 64. Skull: Greatest length 110.7; zygomatic breadth 63.5; post- 
orbital breadth 27.4; nasals 53.3x 17.6; upper toothrow, including 
canine 42, without canine 34.4. 
Local name Rabo Pelado. 
Didelphis paraguayensis meridensis Allen. Merida Opossum. 
One specimen, Paramo de Tama, Venezuela. Alt. 6,000-7,000 ft. 
This was caught by Mr. Jewett in a trap set in a large cavity under 
the roots of a tree in the deep forest. It is in the light phase and the 
dark facial markings are evidently not so greatly reduced as in the type 
of this subspecies. Possibly it is nearer to D. p. andina. 
Local name Faro. 
Marmosa mitis pallidiventris subsp. nov. Pale-bellied Mouse 
Opossum. 
Type from El Guayabal, 10 miles N. of Cucuta, Colombia. No. 
18692 Field Museum of Natural History. Female adult. Collected 
March 14, 1911, by W. H. Osgood and S. G. Jewett. 
Characters. Similar to M. mitis but slightly smaller and consider- 
ably paler, especially on the underparts. Chin, throat, chest, and 
middle of belly delicate pale whitish creamy instead of cream buff as 
in mitis; forefeet and carpal joint whitish without extension of darker 
from the forearm; upperparts, sides, and flanks a slightly paler shade 
of clay color than in mitis, the color of the sides gradually paling over 
the area of hairs with dark bases on either side of the midventral region; 
face markings practically as in mitis, the lower cheeks somewhat paler. 
Skull slightly smaller than in M. mitis; rostrum more “pinched” 
in front of lateral expansions of nasals; otherwise similar. 
Measurements. Type: Total length 284; head and body 129; 
tail vertebree 155; hind foot (c. u.) 20. Skull of type: Greatest length 
33-8; condylo-basal length 33.2; zygomatic breadth 18.9; nasals 15 x 4.5; 
