44 Bulletin American Museum of Natural History. [Vol. XX, 



having much shorter and smaller palatine foramina, larger bullse, 

 broader postpalatal fossa, etc., than flavicans. 



As noted above, there is only a single specimen of this species in 

 the Smith collection, taken at Don Diego in the San Lorenzo Moun- 

 tains. My 0. tr-ichurus, from the coast at Bonda, which Mr. Bangs 

 (I.e., p. 94) considers to be probably a compound of R. Venezuela and 

 his O. flavicans illectus, is not only not a Rhipidomys, but has no close 

 only a congeneric relationship to O. illectus. 



Oryzomys (Oligoryzomys) navus Bangs (I.e., p. 95). Not repre- 

 sented in the Smith collection. 



Oryzomys (Oligoryzomys) dry as humilior Bangs (/. c., p. 95). Not 

 represented in the Smith collection. 



Oryzomys (Zygodontomys) ph&opus obscurior Bangs (/. c., p. 95.) 

 This is my " Akodon " columbianus (see above, p. 437). 



Oryzomys (Erioryzomys} monochromos Bangs (/. c., p. 97). Not 

 represented in the Smith collection.] 



29. Heteromys jesupi Allen. Twenty-two specimens, 

 from seven localities ranging in elevation from sea-level to 

 about 2000 feet. (See this Bulletin, XII, 1899, p. 201.) 



30. Proechimys mincae (Allen). One hundred and 

 twenty-five specimens, skins and skulls, and 14 additional 

 skeletons and several skulls, about two thirds of which were 

 taken at Minca and the rest at or near Bonda. They include 

 a large number of adults of both sexes and young of all stages 

 of immaturity. There is, however, little to add to the ac- 

 count of the species already given. (See this Bulletin, XII, 

 1899, p. 198.) 



31. Proechimys canicollis (Allen). Ninety specimens, 

 skins and skulls, and several additional skeletons and skulls, 

 of which about one half are from Bonda and the rest from 

 Santa Marta and nearby localities. (See this Bulletin, XII, 

 1899, p. 200.) 



" Proechimys minca and P. canicollis. The latter is the 

 commonest rat below 1000 feet; the former takes its place in 

 open lands, dry forests and thickets from about 1000 to about 

 2500 feet; but it does not extend far into the true mountain 

 forest. Some minces are found nearly to sea-level, and cani- 

 collis occurs, rarely, to 2000 feet. Both live in holes in the 

 ground, commonly in shady places and not far from streams. 

 The proportion of tailless individuals is greater than Dr. 



