ALLEN : mammalia: murid^. 63 



tina and Paraguay. Besides those here included, R. typicus Waterh. was 

 described from specimens taken at Maldonaldo, and it has been reported 

 as occurring in southern Paraguay and contiguous portions of Argentina. 

 The other forms are thus far known only from southern Patagonia and 

 Tierra del Fuego. 



Reithrodon cuniculoides Waterhouse. 

 Reithrodon cuniculoides \N2Xtx\\o\xst, P. Z. S., 1837 (Nov. 21, 1837), 3° 

 (Santa Cruz, Patagonia) ; Zoology Voyage Beagle, Mamm., 1839,' 69, 

 pi. xxvi, animal, pi. xxxiv, fig. 2, skull and teeth. — Coues, N. Am.' 

 Rodent, 1877, "9 (ex Waterhouse). — Burmeister, Descript. phys. 

 Rep. Argent, III, 1879, 230 (ex Waterhouse).— Milne-Edwards, Miss. 

 Scient. du Cap Horn, VI, Zool., Mamm., 1890, 10, pi. ii, animal (Santa 

 Cruz, Patagonia).— Trouessart, Cat Mamm., ii, 1897, 533- —Thomas, 

 Ann. and Mag. Nat Hist (7), VIII, Sept, 1901, 254. 

 Adult (April). — Above pale fulvous gray strongly varied with black- 

 tipped hairs, the pelage being dark plumbeous for the basal three fourths 

 or four fifths and ending in a band of pale creamy buff, with a profuse in- 

 termixture of longer, coarser black-tipped hairs ; sides lighter, more yel- 

 lowish, passing gradually into the nearly uniform ochraceous buff of the 

 ventral surface ; inside of the thighs whitish ; ears large, well clothed 

 with short hairs, dusky brown externally, deep buff internally, with a tuft 

 of bufify hairs at the anterior base and a postauricular patch of ochraceous 

 buff; upper surface of the feet white or faintly creamy white ; palms naked, 

 light flesh-color ; soles heavily furred as far as the base of the toes, the 

 furred portion dusky brown, as are the tubercules, but the under surface 

 of the toes flesh-color ; tail rather more than one third the total length, 

 thickly haired, yellowish dusky brown above, sides and below whitish. 



Measttrements. —Eight adults measure: Total length, 225 mm. (215- 

 230, with one 240) ; tail vertebras, 86 (80-90, with one 100); hind foot, 

 34 (33-35)- Ten females measure: Total length, 220 (210-235); tail 

 vertebrae, 88 (80-95, with two at 100) ; hind foot, 33 (32-34). 



Adult skulls measure in total length from 33-35 mm., and in zygomatic 

 breadth from 18-19. 



Represented by 28 specimens, of which 21 were collected at the Basaltic 

 Canons in April, and 4 at Swan Lake in March and May, by Mr. Colburn ; 

 the other three are from the coast region, two of which were collected near 



