1902.] Allen, Opossums of the Genus Didelphis. 275 



the black face markings, which are even more restricted than 

 in true paraguayensis. Although the material for examina- 

 tion is so scanty, it suffices to indicate a very distinct form, 

 the geographical range of which appears to include the 

 Eastern Cordillera region of Colombia and Venezuela! It is 

 evidently cut off in its distribution from true paraguayensis 

 of southern Brazil by the great Amazonian basin, where no 

 form of this group appears to have been reported. Probably 

 in southern Colombia its range connects with that of D. 

 p. andina. In the character and extent of the head markings 

 it, however, much more resembles the Argentina and south 

 Brazilian type than it does either of the Andean forms. 



Tables of the external measurements of the above de- 

 scribed forms of Didelphis follow (pp. 276-279). 



