JAN., 1912. MAMMALS, VENEZUELA AND COLOMBIA OSGOOD. 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 vertebrae 435; hind 

 foot 64. Skull: Greatest length 110.7; zygomatic breadth 63.5; post- 

 orbital breadth 27.4; nasals 53.3x17.6; 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 w^th 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 vertebras 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; 



