238 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.58. 



Mr. Heller did not capture any representative of the subgenus 

 Ohalcomys. 



45. BOLOMYS AMOENUS Thomas. 



Two specimens from Huarocondo, 11,000 feet (Nos. 194724-5). 

 Type locality, Rio Colca ; other specimens in the British Museum 

 from Sangero, Department Puno, and San Anton, Titicaca. 



46. CHROEOMYS INORNATUS Tliomes. 



1917. Chroeomys inornatus Thomas, Smiths. Misc. Coll.. vol. 68, No. 4, 

 p. 2. April 10, 1917. 



Near 0. pulcherrhmis, but ears smaller and special markings re- 

 duced. 



Size and general characters about as in C. pulcherrimus. Color 

 most nearly as in C. p. cruceri,^ to which there is a strong resem- 

 blance throughout. Body a duller olivaceous gray; crown and 

 median dorsal area suffused with dark cinnamon buff, shoulders and 

 sides more grayish, a coloration which gives a deceptive resemblance 

 to the members of the genus Ahrothrix. Underside gray, the bases 

 of the hairs broadly slaty, their tips dull whitish gray ; the result- 

 ing color conspicuously less whitish and less contrasted with the gen- 

 eral tone of the back and sides. Nose spot rich ochraceous, and 

 this color extends on the face up to the forehead and surrounds the 

 eyes. Ears apparently shorter than in C. pulcherriTnus j the color of 

 the visible parts warm brown, not contrasted with the general color 

 of the head. Post-auricular patches comparatively very inconspicu- 

 ous; the tips only of the hairs on this part grayish white, and the 

 extent of the patches reduced, surpassed behind by the ears them- 

 selves, and widely separated from the gray on the sides of the neck. 

 Hands white; feet with the metatarsals pale cinnamon, the digits 

 whitish. Claws apparently less elongated than in the allied species. 

 Tail well haired, blackish along the middle line above, pale cinna- 

 mon on sides, whitish below. 



Skull (pi. 15, fig. 3) essentially similar to that of C. pulcherrimus, 

 but the bullae rather smaller. The type has its incisors as strongly 

 colored as in Akodon. which is not usual in Chroeomys, but the sec- 

 ond specimen is intermediate in this respect. 



Dimensions of the type. — Head and body, 122; tail, 80; hindfoot, 

 24.5; ear, 16.' Skull— greatest length, 30; condylo-incisive length, 

 27.6; zygomatic breadth, 15.6; nasals, 12.4; interorbital breadth, 5; 

 palatilar length, 12.5 ; palatal foranina, 6.9 ; upper molar series, 4.3. 



Type.— KdiWlt female from Ollantaytambo. U.S.N.M. No. 194685. 

 Original No. 457. Collected July 20, 1915. 



» See Ann. and Mag. Nat. Hist., ser. 7, vol. 7, p. 186, 1901. 

 -Ear of other specimen measured as 18 mm. 



