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 vertebre, 70; hind foot, 
1g. 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 (Rheithrodontomys!), Allen, Bull. Am. Mus. Nat. 
Hist:, 1903. p. 602. 
Rio SEesTtiIn MEADow Mouse. 
Type locality. Rio Sestin, State of Durango, Mexico, Altitude, 
7,500 Leet. 
Genl. Char. Similar to Rk. megalotis; tail longer. 
Color. Like k. 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 vertebre, 69; hind foot, 
18; ear from notch, 14. 
b.—zaecatece (Reithrodontomys!), Merr., Proc. Wash. Acad. Scien., 
Lit ROL) passin 
VALPARAISO Harvest Mouse. 
Type locality. Valparaiso Mountains, State of Zacatecas, Mexico. 
