ZYGODONTOMYS. RHITHRODONTOM YS. (io 



Genus Zygodontomys (68). 



Zygodontomys cherriei ventriosus Goldman. 



Zygodontomys cherriei ventriosus Goldm., Smith. Misc. Coll., LVI, 

 No. 36, 1912, p. 8. 



Type locality. Tabernilla, Canal Zone, Panama. 



Genl. Char. Similar to Z. cherriei, but larger, color paler. 



Color. Head and upperparts grayish brown, dorsal line darker; 

 flanks paler, more gray; outer side of limbs like flanks; underparts 

 and inner side of limbs creamy white; tail above grayish, beneath 

 whitish; hands and feet white, ears brownish, long rusty hairs on 

 anterior base. Ex type in United States National Museum. 



Measure merits. Total length, 240; tail, 104; hind foot, 28. 

 Skull: Occipito-nasal length, 31.7; Hensel, 25.3;' zygomatic width, 

 15.9; in tertemporal width, 4.9; length of nasals, 10.4 j palatal length, 

 6.5; length of upper molar series, 4.2; length of lower molar series, 5. 

 Ex type in United States National Museum. 



Genus Rhithrodontomys (70). Harvest Mice. 



Rhithrodontomys australis modestus Thomas. 



Reithrodontomys (!) modestus Thomas, Ann. and Mag. Nat. Hist., 



7th ser., XX, 1907, p. 163. 

 Reithrodontomys (!) australis modestus Howell, N. Am. Fauna, No. 



36, 1914, p. 63. 

 Type locality. Jinotega, Nicaragua, Central America. 



Rhithrodontomys humulis (Bachman). 



Mus humulis Bachman, in Aud. and Bach., Proc. Acad. Nat. Sci. 



Phila., 1841, p. 97. 

 Mus lecontii. Aud. and Bach., Journ. Acad. Nat. Sci. Phila., 1842, 



P- 37- 

 Mus humilis Aud. and Bach., Quad. N. Am., II, 1851, p. 103, pi. 



Ixv, p. 116. 

 Reithrodontomys humulis Osgood, Proc. Biol. Soc. Wash., XX, 1907, 



p. 49; Howell, N. Am. Fauna, No. 36, 1914, p. 19. 

 Rhithrodontomys lecontei Elliot, Check-List Mamm. N. Am. & 



W. Indies, F. C. M. Pub., VI, 1905, p. 191, Zool. Ser. 

 Dr. Allen (Bull. Am. Mus. Nat. Hist., VII, 1895, p. 116) rejected 

 Bachman's name of humulis for this species because it was not stated 

 in the description that the incisors were grooved, and therefore it 



