64 RHITHRODONTOMYS. 



could not have been a Rhithrodontomys. Mr. Osgood (/. c.) decides 

 against this view of the case because the original description, the 

 vernacular name " Little Harvest Mouse" and the colored plate 

 (No. LXV) all indicate a species of this genus, and not a Mus or 

 Peromyscus. It might also be advanced that as Bachman regarded it 

 as belonging to the Linnsean genus Mus, he probably did not look for 

 or perceive any generic character which might separate his specimen 

 from the genus in which he placed it, and the grooving was either not 

 noticed at all, or else regarded as of no especial consequence. The 

 evidence would seem to prove, however, that it was a Rhithrodontomys 

 he called Mus humulis, and this was identical with the species found 

 on the eastern coast of South Carolina and Georgia, and that R. 

 lecontii (Aud. & Bach.) must become a synonym. 



Rhithrodontomys raviventris Dixon. 



Reithrodontomys (!) raviventris Dixon, Proc. Biol. Soc. Wash., XXI, 

 1908, p. 197. 



Type locality. Redwood City, San Mateo County, California. 



Genl. Char. Darker than R. longicauda, underparts bright fulvous. 



Color. Sides of nose brownish black; lips black; chin has white 

 spot in some examples: upperparts black; hands and feet purple; 

 fingers and toes white; underparts bright fulvous; tail black. 



Measurements. Total length, 146; tail, 70; hind foot, 17. 



Rhithrodontomys halicostes Dixon. 



Reithrodontomys (!) halicostes Dixon, Univ. Cal. Pub. Zool., V. 1909, 

 p. 271. 



Type locality. Three miles south of Petaluma, Sonora County, 

 California. 



Rhithrodontomys griseus Bailey. 



Reithrodontomys griseus Ba'ley, N. Am. Fauna, No. 25, 1905, p. 106. 

 Little Gray Harvest Mouse. 



Type locality. San Antonio, Texas. 



Geogr. Dist. From San Antonio north into southeastern Nebraska. 



Genl. Char. Size small; tail short, bicolor. 



Color. Above dark buffy gray, dorsal line darker; black spots on 

 upper outer surface of ear, and another on the lower inner surface; 

 hands, feet, and underparts white; tail above blackish, beneath white. 

 Ex type in United States National Museum. 



Measurements. Total length, 120; tail vertebrae, 56; hind foot, 14. 

 Skull: Occipi to-nasal length, 19.2; basal length, 16; nasals, 7; zygo- 

 matic breadth, 10.4; mastoid breadth, 9; width of braincase, 9.8; 



