RHITHRODONTOMYS. 259 
249. australis (Reithrodontomys!), Allen, Bull. Am. Mus. Nat. Hist., 
1895, p. 328. 
IraztU Votcano 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 vertebre, 80; hind foot, 
18; ear from crown, to. Skull: total length, 23; basal length, 20; 
width of braincase, 11; zygomatic width, 10; interorbital constric- 
tion, 3.7; length of nasals, 8. (ex Type.) 
J 
a.—vuleanius (Retthrodontomys!), Bangs, Bull. Mus. Comp. Zodl., 
SeLIk, POO, Pp. 38. 
Cuir1guI 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 vertebre, 96; hind foot, 
19; ear, 17. Skull: basal length, 19.4; occipito-nasal length, 22.8; 
zygomatic width, 11.4; mastoid width, 11; 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. 
desertt, Allen, Bull. Am. Mus. Nat. Hist., 1895, p. 127. 
megalotis (Rhithrodontomys), Elliot, Syn. N. Am. Mamm., rgo01, 
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 
