102 



ZOOLOGY. 



Specimens. 



Genus HESPEROMYS, Waterh. 



Submenus VESPERIMUS, Coues. 

 Musculus, RAF.. Am. Moutb. Mag., iii, 1818. 446 (used in connection with leucopus, but 



ineligible for obvious reasons). Hcspcromys, BAIED (witb exclusion of 



Onychomys and Oryzomys). 



Calomys, ATTD. & BAOH., Q. N. A., ii, 1851, 303 (type aureolm ; not of Waterhonse). 

 Vcsperhmts, COUES, Proc. Acad. Nat. Sci. Pbila., 1874, 178. 



CHARS. Teeth strictly siginodont. Back upper border of orbit not beaded (com- 

 pare Onycliomys and Oryzomys), Coronoid not attaining level of coudyle. Cranial 

 and dental characters iu general strictly those of Hesperomys. Small but well-devel- 

 oped cheek-pouches! Of medium and small size, lithe form, and quick movement. 

 Eyes large, prominent. Snout pointed. Ears large, rounded, tbiu, scantily and finely 

 pilous ; autitragus evident but not valvular. Fore feet hardly or not half as long as 

 the binder; palms naked ; fore claws not larger than the binder; digits slender, 3d 

 and 4th subequal and longest, 2d and 5th successively much shorter. Hind feet long, 

 slender; soles tuberculate, naked or scant-furred on the posterior third; L'd, 3d, and 

 4th subequal and much the longest; 5th shorter; 1st shortest. Tail terete, slender, 

 closely hairy, ranging iu length from as long as body alone to a little longer than head 

 and body. Pelage soft, close, glossy, with but few longer bristly hairs ; feet and 

 under parts white or whitish ; body and tail more or less distinctly bicolor. No woolly 

 tufts of hair about the ears. Type, V. leucopus. 



HESPEROMYS (VESPERIMUS) AMER1CANUS, (Kerr) Coues. 

 White-footed mouse. 



American Field Mouse or Eat, PENN., Syn., 1771, No. 303; Hist. Quad., 1781, No. 302; 



Arct. Zool., i, 1784, 131. 



American Wandering House, BARTON, Med. & Surg. Jonru. Pbila., i, 1805, 31. 

 Mus sylvatieus, var., EEXL., Syst. Av., i, 1775, 390 (based on "New York var." of 



Pennant). 



Mus syleaticus var. novcbomccnsis, FiscH., Syn., 1829, 318 (the same). 

 Mtts noveboraccnsis, SELYS-LoNacH., Etudes Microm., 1839, 07. 

 Mus agrarius var. americanus, KERB'S Linn., 1792, 231 (based on Pennant). 

 Mus agrarius, GODM., Am. Nat. Hist., i, 3d ed., 1800, 310 (also in the earlier editions). 

 Cnn-lnx iiii/,>i,li'K, GAPI-ER, Zool. Joiiru., v, 1830, 204, pi. 10 (Canada). 



HI I/miles, BAIKD, M. N. A., 1857, 472 (Vermont, based on Gapper). 



