^^8 MERRIAM 



REITHRODONTOMYS MEGALOTIS OBSCURUS subsp. nov. 



Type from Sierra Madre, near Guadalupe y Calvo, Chihuahua, 

 Mexico. No. 95277. $ ad. U. S. National Museum, Biological 

 Survey Coll. Aug. 26, 1898. E. W. Nelson and E. A. Goldman. 

 Orig. no. 12900. 



Characters. — Similar to megalotis but everywhere very much 

 darker, upperparts conspicuously lined with and darkened by black 

 hairs; underparts buffy salmon (instead of white), with pale fulvous 

 pectoral patch. Skull as in megalotis. Compared with saturatus 

 which is a size larger, the ground color of upperparts is grayer (less 

 fulvous) the underparts slightly more tinged with buffy salmon, and the 

 pectoral region is pale fulvous. The skull, like that of tnegalotis^ 

 differs from saturates in smaller size, shorter rostrum, usually shorter 

 incisive foramina, smaller bullae, and shorter molar series. 



Measuremoits. — Type specimen {$ ad.) : total length 167 mm.; 

 tail vertebra 90; hind foot 19. 



