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 vertebras, 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 (Rheithrodontomys!), Allen, Bull. Am. Mus. Nat. 



Hist., 1903, p. 602. 

 Rio SESTIN MEADOW MOUSE. 



Type locality. Rio Sestin, State of Durango, Mexico, Altitude, 

 7,500 feet. 



Genl. Char. Similar to R. megalotis', tail longer. 



Color. Like R. 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 vertebras, 69; hind foot, 

 18; ear from notch, 14. 



b. zdcatecw (Rcithrodontomys!}, Merr., Proc. Wash. Acad. Scien., 



in, 1901, p. 557. 

 VALPARAISO HARVEST MOUSE. 



Type locality. Valparaiso Mountains, State of Zacatecas, Mexico. 



