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



June 23 and 24. These are rather more fulvous, both above 

 and below, than average specimens from the United States. 



"HousE RATS. Apparently the only common species is 

 the roof rat; this is abundant in all the settlements and is 

 sure to invade new clearings soon after they are started; it 

 was often trapped in old clearings half a mile or more from 

 houses. The only other species we heard of is the house 

 mouse which occurs at Santa Marta, but it is not abun- 

 dant." H. H. S. 



20. Oryzomys maculi venter Allen. Fifty -two specimens, 

 skins and skulls, and 10 skeletons and skulls, mainly from El 

 Libano and Valparaiso. (See this Bulletin, XII, 1899, p. 

 204.) 



Since this species was first described I have had the oppor- 

 tunity to make direct comparison of a series of specimens of it 

 with O. meridensis Thomas, to which 0. maculiventer has been 

 referred by Mr. Bangs, and find no difficulty in distinguish- 

 ing the two forms. Though closely allied, they are easily 

 separable. 



"This is the commonest species in the San Lorenzo Moun- 

 tains, from about 4000 to 6000 feet. We found their holes 

 commonly in rocky places, in crevices of the stone; some- 

 times under stumps or logs." H. H. S. 



21. Oryzomys illectus (Bangs). One specimen, adult, Don 

 Diego, May 9. 



This species was considered by Mr. Bangs to be a sub- 

 species of 0. flavicans Thomas, from Merida, Venezuela. 

 With a large series of topotypes of O. flavicans before me, I 

 have no hesitation in considering the two forms as specifically 

 distinct, especially as it is highly improbable that their ranges 

 can be continuous. 



2 2 . Oryzomys (Zygodontomys) sanctaemartae A lien. Eight 

 specimens, Mamatoca, and vicinity. (See this Bulletin, XII, 

 1899, p. 207). 



23. Oryzomys magdalenae Allen. Two specimens, Minca 

 and Valparaiso. (See this Bulletin, XII, 1899, p. 209.) 



24. Oryzomys villosus Allen. Two specimens, Valpa- 

 raiso and Don Diego. (See this Bulletin, XII, 1899, p. 210.) 



