MICROTUS. 299 
Pitymys McMurtr., Am. ed. Cuv., Anim. King., 1, App., 1831, 
Pp. 434 (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, pl. 1. 
Lagurus Glog., Hand-u-Hilfsb. Naturgesch., 1841, p. 97. 
Neodon Hodg., Ann. Mag. Nat. Hist., 2d Ser., 111, 1849, p. 203. 
Agricola Blas., Faun. Wirbelt. Deutsch., 1857, pp. 334-335, 368- 
374, figs. 202-206. 
Chilotus Baird, N. Am. Mamm., 1857, p. 516. 
Paludicola Blas., 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. Léman, Ass. Zo6l. Léman, 
1867, pp. 63-72, pl. 1, figs. 18-25, pl. v1. 
Ochetomys Fitzin., Sitzungb., K. Akad. Wiss. Wien., Lv1, 1867, 
P- 47- 
Praticola Fatio, Les Campagn. Bass. Léman, Ass. Zool. Léman., 
1867, p. 36. (Part.) 
Terricola Fatio, Les Campagn. Bass. Léman, Ass. Zool. Léman, 
1867, p. 36. 
Micrurus Forsyth-Major, Alt. dell. Soc. Tosc. Scien. Nat., Pisa, 
Ill, 1876, p. 126. 
Eremiomys Palyakoff Mem. Acad. Imp. Sci. St. Petersb., xxx1x, 
Suppl., 1881, p. 35. 
Neofiber True, Science, 1884, p. 34. 
Camptcola Schulze, Schrift. Natur. Ver. Harz. Wernig., v, 1890, 
Ppp. 24, 25. 
Tetramerodon Rhoads, Proc. Acad. Nat. Scien. Phil., 1894, p. 282. 
Aulacomys Rhoads, Am. Nat., 1894, p. 182. 
Orthriomys Merr., Proc. Biol. Soc. Wash., x11, 1898, p. 106. 
Herpetomys Merr., Proc. Biol. Soc. Wash., x11, 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. 
