260 RHITHRODONTOMYS, 
Fig. XLI. RHITHRODONTOMYS MEGALOTIS. 
BIG-EARED HARVEST MOUSE. 
parts yellowish or grayish white; tail above like back; sides and 
beneath pale gray; hands and feet grayish white. Young animals 
have blackish ear spots and are grayer. 
Measurements. Total length, 143; tail vertebra, 70; hind foot, 
19. Skull: occipito-nasal length, 20; Hensel, 14; zygomatic width, 
10; interorbital constriction, 3; length of nasals, 8; palatal length, 7; 
length of upper molar series, 3. 
a.—sestinensis (kXhetthrodontomys!), Allen, Bull. Am. Mus. Nat. 
Hist., 1903, p. 602. 
Rio Sestin Meapow Mouse. 
Type locality. Rio Sestin, State of Durango, Mexico, Altitude, 
7,500 feet. 
Genl. Char. Similar to Rk. megalotis; tail longer. 
Color. Like &. megalotis, ‘‘but upper parts more strongly varied 
with black and less fulvous, and with relatively longer tail.”’ 
(Allen, 1. c.) 
Measurements. Total length, 130; tail vertebra, 69; hind foot, 
18; ear from notch, 14. 
b.—zacatece (Retthrodontomys!), Merr., Proc. Wash. Acad. Scien., 
lil, Loot, De 557 
VALPARAISO HARvEstT Mouse. 
Type locality. Valparaiso Mountains, State of Zacatecas, Mexico. 
