MAMMALS OF THE MEXICAN BOUNDARY 



459 



whitish. Feet dull soiled white; ears large, thinly haired, brown externally, yellowish 

 brown internally. Tail long, distinctly bicolor, the upper third dull brown, the rest soiled 

 grayish white, covered with fine short hairs, which form a slight pencil at tip. 



The young are darker with less fulvous. 



In the new full coat the fulvous tint is stronger, the lateral line broader and brighter, and 

 the lower surface whiter. In worn breeding pelage the tints are all paler. 



Measurements. — ^Type specfraen, S ad-: total length, 156; tail vertebrse, 89; hind foot, 

 19; car (from skin), 12. 



(Bull. Am. Mus. Nat. Hist., VIII, 1896, p. 235.) 



REITHRODONTOMYS FULVESCENS Allen. 

 SONORAN HAEVEST-MOUSE. 



Reithrodontomys mexicanus fulvescens Allen, Bull. Am. Mus. Nat. Hist., VI, p. 319, 

 Nov. 7, 1894 (original description). 



Reithrodontomys fulvescens, Allen, Bull. Am. Mus. Nat. Hist., VII, p. 138, May 21, 

 1895, (10 miles south of Oposura, Sonora, Mexico); VII, Art. VI, June 29, 1895, 

 p. 235.— Miller and Rehn, Proc. Bost. Soc. Nat. Hist., XXX, No. 1, Dec. 27, 

 1901, p. 96 (Syst. Results Study N. Am. Mam. to close of 1900). 



R[eithrodontomys] m\exicanus] fulvescens, Elliot, Field Col. Mus., Zool. Ser., IV, 1904, 

 pp. 257 and 264 (Mam. Mid, Am.). 



Type-locality. — Ten miles south, of Oposura, Sonora, Mexico, in the 

 valley of the Yaqui River. (Type, skin and skull, in the American 

 Museum of Natural History, New York.) 



Geographical range. — Basin of the Yaqui River, Sonora, Mexico. 

 Lower Sonoran (and Tropical?) Zone. 



The following is the original description: 



Description. — ^Above yellowish brown, more or less heavily lined with black; a bright, 

 strongly marked fulvous lateral line; below whitish, the basal two-thirds of the pelage 

 plumbeous; ears dusky externally, rusty within, well clothed with fine short hairs; tail 

 indistinctly bicolor, pale brown above, lighter below, sparsely haired, but the hairs pretty 

 thoroughly concealing the annulations; feet soiled white, heels sparsely covered as far as 

 the first tubercle with fine short hairs. 



Mea,surements. — Total lengtife (type), 183 mm.; tail vertebrse, 102; hind foot, 19; ear, 14. 

 Average of three adults (2 males, 1 female): Total length, 172; tail vertebrae, 99; hind foot, 

 19.3; ear, 14.7. (Bull. Am. Mus. Nat. Hist., VI, 1894, p. 319.) 



This [species] is represented by three adult specimens taken by Mr. 

 B. C. Condit at Oposura, Sonora, May 31 and June 1, 1894. 



REITHRODONTOMYS ARIZONENSIS Allen. 

 CHIRIOAHUA MOUNTAIN HARVEST-MOUSE. 



Reithrodontomys arisonensis Allen, Bull. Am. Mus. Nat. Hist., VII, p. 134, May 21, 

 1895 (original description) ; VII, p. 235, June 29, 1895 (Rock Creek, Chiricahua 

 Mountains, altitude about 8,000 feet). — Miller and Rehn, Proc. Bost. Soc. Nat. 



