MICROTUS. 299 



Pitymys McMurtr., Am. ed. Cuv., Anim. King., i, App., 1831, 



p. 4^4. (footnote). 

 Ammomys Bon., Sagg. Dist. Met. degli. Anim. Vert., 1831, p. 20 



(footnote) . 

 Pinemys Less., Hist. Nat. Mamm. et Ois. decouv. depuis, 1788; 



Ouvre de Buff., v, 1836, p. 436. 

 Hemiotomys Selys Longchamps, Essai, Mon. Campagn. Envir. 



Liege, 1836, p. 7,' pi. i. 



Lagurus Glog., Hand-u-Hilfsb. Naturgesch., 1841, p. 97. 

 Neodon Hodg., Ann. Mag. Nat. Hist., 26. Ser., in, 1849, p. 203. 

 Agricola Bias., Faun. Wirbelt. Deutsch., 1857, pp. 334-335, 368- 



374, figs. 202-206. 



Chilotus Baird, N. Am. Mamm., 1857, p. 516. 

 Paludicola Bias., Faun. Wirbelt Deutsch., 1857, pp. 333-334, 343- 



368, figs. 183-201. 



Pedomys Baird, N. Am. Mamm., 1857, p. 517. 

 Sylvicola Fatio., Les Campagn., Bass. Le'man, Ass. Zool. Le'man, 



1867, pp. 63-72, pi. i, figs. 18-25, pl- VI - 

 Ochetomys Fitzin., Sitzungb., K. Akad. Wiss. Wien., LVI, 1867, 



P- 47- 

 Praticola Fatio, Les Campagn. Bass. Leman, Ass. Zool. Le'man., 



1867, p. 36. (Part.) 

 Terricola Fatio, Les Campagn. Bass. Le'man, Ass. Zool. Leman, 



1867, p. 36. 

 Micrurus Forsyth-Major, Alt. dell. Soc. Tosc. Scien. Nat., Pisa, 



in, 1876, p. 126. 

 Eremiomys Palyakoff Mem. Acad. Imp. Sci. St. Petersb., xxxix, 



Suppl., 1881, p. 35. 

 Neofiber True, Science, 1884, p. 34. 

 Campicola Schulze, Schrift. Natur. Ver. Harz. Wernig., v, 1890, 



PP- 24, 25. 



Tctramerodon Rhoads, Proc. Acad. Nat. Scien. Phil., 1894, p. 282. 

 Aulacomys Rhoads, Am. Nat., 1894, p. 182. 

 Orthriomys Merr., Proc. Biol. Soc. Wash., xn, 1898, p. 106. 

 Herpetomys Merr., Proc. Biol. Soc. Wash., xn, 1898, p. 107. 



Molars not rooted; mandibular molars without closed triangles 

 on outer side ; upper incisors not grooved ; root of lower incisor extends 

 back to third molar, displacing base of that tooth and terminating 

 above the dental foramina of the ascending ramus; tail terete, longer 

 than hind foot; posterior border of bony palate very variable; middle 

 part of zygoma only slightly expanded; postorbital process of squa- 

 mosal shelf-like. 



