104 LONCHERES. PROECHIMYS. 



underparts white; tail brown above, whitish beneath; hands and feet 

 whitish. Ex type in United States National Museum. 



Measurements. Total length, 224; tail, 138; hind foot, 31. 

 Skull: Occipito-nasal length, 23.8; Hensel, 17.9; zygomatic width, 

 11.2; intertemporal width, 4.5; width of braincase, 10; length of 

 nasals, 9.6; length of upper molar series, 3.4; length of mandible, 12.2; 

 length of lower molar series, 3.4. 



Zapus luteus australis Bailey. 



Zapus luteus australis Bailey, Proc. Biol. Soc. Wash., XXVI r 

 1913, p. 132. 



Type locality. Socorro, New Mexico. 



Genl. Char. Smaller and darker than Z. luteus; skull narrower. 



Color. Upperparts pale buffy yellow, lined with black hairs, 

 black somewhat darker; dorsal area indistinctly marked; underparts 

 pure white; hands and feet white; heels dusky; tail brown above r 

 white beneath. Ex type in United States National Museum. 



Measurements. Total length, 205; tail, 124; hind foot, 29.5. 

 Skull: Occipito-nasal length, 21.8; Hensel, 16.5; zygomatic width, 

 10.7; intertemporal width, 4.2; length of nasals, 8 ; palatal length, 3.3; 

 length of upper molar series, 3.2; length of mandible, 10.8; length of 

 lower molar series, 3.4. Ex type in United States National Museum. 



Family Octodontidae. 

 Subfamily Loncherinae. 



Genus Loncheres (101). 



Loncheres armatus (I. Geoffrey) . 



Nelomys armatus I. Geoffroy, Ann. Sci. Nat., X, Ser. 2, 1838, p. 125. 



Type locality. Cayenne, French Guiana. 



Geogr. Distr. French Guiana; Island of Martinique, Lesser 

 Antilles. Type in Paris Museum. 



Genus Proechimys (102). 



Proechimys rubellus Hollister. 



Proechimys rubellus Hollister, Proc. Biol. Soc. Wash., XXVII, 



iQM, p. 57- 

 Type locality. Angostura Valley, Costa Rica. 



