64 PATAGONIAN EXPEDITIONS: ZOOLOGY. 



Santa Cruz, in February, by Mr. Colburn, and the other at the mouth of 

 the Rio Coy, by Mr. Peterson, November lo. This specimen has the 

 ears nearly naked and dark brown on both surfaces, and the general col- 

 oration is browner and less olivaceous than in the March, April and May 

 specimens. 



Mr. Peterson's manuscript notes indicate that some of the specimens 

 taken were "caught in heavy grass, close to springs of water." 



The original specimens described by Waterhouse were taken by Dar- 

 win, who says : " Specimens were procured at Port Desire, St. Julian, and 

 Santa Cruz ; at this latter place they were caught in numbers (in traps 

 baited with cheese), both near the coast and on the interior plains. A 

 specimen from Santa Cruz weighed 1336 grains. In the early part of 

 January, there were young individuals at Port St. Julian." (Z06I. Voy. 

 Beagle, Mamm., p. 71.) 



Mr. Colburn's localities show that the species ranges in the interior to 

 one hundred and fifty or two hundred miles northwest of St. Julian and 

 Santa Cruz. 



Reithrodon cuniculoides obscurus Allen. 



Reitlirocion ciDiicitloides obsctirus Allen, Bull. Am. Mus. Nat. Hist., XIX, 

 190, May 9, 1903. Punta Arenas, Patagonia. 



Similar to Reithrodon cnnicnloides but darker throughout, the upper 

 parts dark brown, varied with black-tipped hairs and suffused with fulvous, 

 the sides yellowish, and the ventral surface brownish ochraceous ; inner 

 side of thighs and anal region whitish ; top of head 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 postauricular patch ; upper sur- 

 face of feet clear white; tail blackish above along median line, sides and 

 below grayish white. 



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

 and body, 130; tail, 65; hind foot, 34. (The tail appears 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 specimen to be fully adult, and larger 

 than any skull in the large series of R. cunicttloides. It is characterized 

 by its very strong, dark coloration, between which and the darkest, most- 



