Article XVIII. ON MAMMALS COLLECTED IN 

 SOUTHEASTERN PERU, BY MR. H. H. KEAYS, 

 WITH DESCRIPTIONS OF NEW SPECIES. 



By J. A. ALLEN. 



The Museum has recently received two small collections of 

 mammals made by Mr. H. H. Keays, at Juliaca, in southeastern 

 Peru, a little to the westward of Lake Titicaca. Mr. Keays 

 writes : " Our camp is situated in the loop of the Inambary 

 River. The country is very broken, with deep narrow canons, 

 and is covered with a dense undergrowth of shrubs and vines, 

 with here or there a palmetto or a cedar rising above the sur- 

 rounding vegetation." He gives the altitude as 6000 feet, and 

 the position as latitude 13 30' S., longitude 70 W. 



The collections number only 18 species, but contained several 

 not previously described, and others of special interest. The 

 collector's field notes are enclosed by marks of quotation, and are 

 followed by the initials H. H. K., when not otherwise indicated. 



I. Chironectes minimus Zimmermann. One specimen, an 

 adult male, taken Jan. 28, 1900. Mr. Keays says it "came into 

 the mill in the flume, the flume at that time taking up all the water 

 of the creek." 



2. Didelphis pernigra Allen. 



Didelphis pernigra ALLEN, Bull. Am. Mus. Nat. Hist. XIII, 1900, 191. Oct. 

 23, 1900. 



Three specimens, as already described (/. c.}. " Apparently 

 quite common, judging by their signs along the trail. One of 

 these animals had been robbing my traps of their bait for several 

 days when he was caught by one front toe." H. H. K. 



3. Thylamys keaysi Allen. 



Thylamys keaysi ALLEN, Bull. Am. Mus. Nat. Hist. XIII, 1900, 198. Oct. 

 23, 1900. 



Three specimens, as already described (/. c.\ " Two of the 

 three specimens were found dead in the trail, having been killed 



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