1903.] Allen, New Rodents from Patagonia. 19 J 



blackish, slightly varied with buff-tipped hairs ; sides of nose and cheeks 

 brownish ochraceous like the ventral surface; ears very thinly haired, 

 brown externally, brownish buff internally, with a deep ochraceous 

 buff post-auricular patch; upper surface of feet clear white; tail 

 blackish above along median line, sides and below grayish white. 



Measurements (of type, from dry skin). Total length, 195; head 

 and body, 130; tail, 65; hind foot, 34. (The tail seems to have lost 

 a small portion of the tip.) Skull (imperfect), length of nasals, 15.5; 

 palatal length, 18; palatal foramina, 10; diastema, 9.5; upper molar 

 series, 6. 



Unfortunately represented by only the type specimen, 

 which has no flesh measurements. The skull shows the speci- 

 men to be fully adult, and larger than any skull in the large 

 series of R. cuniculoides. It is characterized by its strong, 

 dark coloration, between which and the darkest, most-deeply 

 colored specimen in a series of 28 examples from the coast 

 region and the interior plains, there is a striking contrast 

 through the greater depth and intensity of all the tints. Con- 

 sidering the climatic conditions of the two regions, the 

 moist, forested country of the Punta Arenas district, and the 

 open, arid plains of the coast and interior the differences 

 here shown in the coloration of the two phases conform to 

 what would be expected to result from such diverse physical 

 conditions. The differences are certainly not to be accounted 

 for by season or age. It finds an exact parallel in the cases 

 of Akodon xanthorhinus as compared with A. canescens, and 

 A. michaelseni as compared with A. macronyx. 



Reithrodon hatcheri, sp. nov. 



Type, No. 84210, U. S. Nat. Mus., $ ad., Pacific slope of the Cor- 

 dilleras, head of the Rio Chico de Santa Cruz, March n, 1897; O. A. 

 Peterson. Named in honor of Mr. J. B. Hatcher, Director of the 

 Princeton Patagonia Expeditions. 



Similar in size and proportions to R. cuniculoides, but much darker, 

 and with much less fulvous suffusion. 



Adult male (type), March. Above dark grayish brown, varied 

 with black-tipped hairs, faintly suffused with grayish fulvous; sides 

 paler, passing gradually into the pale buff of the ventral surface; 

 sides of nose, lower border of cheeks, lower border of flanks, and whole 

 ventral surface cream-buff, except inside of thighs and adjoining por- 

 tion of ventral surface; ears rather thinly haired, externally dull 



