RHITHRODONTOMYS. 259 



249. australis (Reithrodontomys!), Allen, Bull. Am. Mus. Nat. Hist., 



1895, p. 328. 

 IRAZU VOLCANO HARVEST MOUSE. 



Type locality. Volcano of Irazti, Costa Rica. 



Geogr. Distr. Costa Rica; range unknown. 



Genl. Char. "Similar to R. longicauda in winter, but larger." 



Color. Above yellowish brown, lined with black; sides lighter; 

 under parts ashy plumbeous tinged with buff; tail above dusky 

 brown, beneath whitish; hands and feet grayish; ears blackish. 



Measurements. Total length, 158; tail vertebrae, 80; hind foot, 

 18; ear from crown, 10. Skull: total length, 23; basal length, 20; 

 width of braincase, n; zygomatic width, 10; interorbital constric- 

 tion, 3.7; length of nasals, 8. (ex Type.) 



a. vulcniiiiis (Reithrodontomys!}, Bangs, Bull. Mus. Comp. Zool., 



xxxix, 1902, p. 38. 

 CHIRIQUI HARVEST MOUSE. 



Type locality. Volcan de Chiriqui, Chiriqui, Panama. Altitude, 

 10,300 feet. 



Genl. Char. Similar to R. australis, but darker; pelage long, silky. 



Color. Dorsal region sepia, shading on sides to Isabella; top of 

 head grayer; under parts Isabella, tinged with cinnamon between 

 arms and about vent; feet and hands grayish; tail dusky above, 

 grayish beneath; ears sepia. 



Measurements. Total length, 170; tail vertebra?, 96; hind foot, 

 19; ear, 17. Skull: basal length, 19.4; occipito-nasal length, 22.8; 

 zygomatic width, 11.4; mastoid' width, n; interorbital width, 3.4; 

 length of nasals, 8.2; width of nasals, 2.6; length of palate to palatal 

 notch, 9.2; length of palatal slits, 5; width of palatal slits, 1.8; upper 

 molar series, 3.2; length of single half mandible, 11.4. (Bangs, 1. c.) 



250. megalotis (Reithrodon!) , Baird, N. Am. Mamm., 1857, p. 451. 

 aztecus, Allen, Bull. Am. Mus. Nat. Hist., 1893, p. 79. 



deserti, Allen, Bull. Am. Mus. Nat. Hist., 1895, P- I2 7- 



megalotis (Rhithrodontomys} , Elliot, Syn. N. Am. Mamm., 1901, 



p. 151. Id. Suppl. p. 494. 

 BIG-EARED HARVEST MOUSE. 



Type locality. Between Janos and San Luis Spring, State of 

 Sonora, Mexico, near boundary of Grant County, New Mexico. 



Geogr. Distr. States of Sonora and Chihuahua, Mexico, north to 

 Nevada. 



Genl. Char. Tail equals the body in length, without head. 



Color. Upper parts mouse gray (sometimes tinged with reddish 

 on back), and lined with black; rump washed with fulvous; under 



