CHRONOLOGICAL CATALOGUE. 47 



1857. Baird, Spencer F. — Continued. 



26. CYXOMYS, Eaf. 



109. Cynomys ludovicianus pi. xlvii, flgg. 2, 3 p. 331 



110. Cynomys GMnmsomi, Baird, n. s pi. xlvii, fig. 1 335 



27. AKCTOMTS, Schiieber. 



111. Arctomys monax, Gmelin pi. xlix, fig. 1 339 



112. Arctomys flaviventer, Bachmau pi. xlvii, fig. 1 343 



28. ArLODONTIA, KiCH. 



113. Aplodontia lejjorina. Kicb pi. xx, fig. 4 353 



29. CASTOR, LiXN. 



114. Castor canadensis, Kiihl pi. xlviii, fig. 1 355 



30. CASTOROIDES, Foster. 



115. Castoroides ohioensis, Foster 363 



31. GEOMTS, EAFraESQUE. 



116. Geomys bursarius, Rich pi. xxii, fig. 1 ; pi. 1, fig. 2 372 



117. Geomys breviceps, Baird, u. s pi. lii, fig. 2 378 



118. Geomys pinetis, Eafinesqiie pi. xxii, fig. 3 380 



119 Geomys ClarHi, Baird, n. s 383 



120. Geomys castanops, Lecontc pi. x, fig. 2 ; pi. 1, fig. 1 384 



KOTE. — Tho following Mexican species are referred to : 



Geomys hispidus, Leconte. — Mexico pi. xxii, fig. 4 386 



Geomys mexicanus, Leconte. — :Mcxico 387 



32. THOMOMTS, Maxim. 



121. Thomomys bidbimrus pll. xli, 1, fig. 3 ; pi. lii, fig. 1 389 



122. Thomomys laticeps, Baird, u. s pi. xii, fig. 1 392 



123. Thomomys Bouglassn, Giebel 394 



124 Thomomys borealis , pi. xxii, fig. 2 396 



125. Thomomys riifcscens, Maxim pi. x, fig. 1 397 



126. Thomomys umbrinus 399 



127. Thomomys fidvus pi. xii, fig. 2 402 



33. DIPODOMYS, Gray. 



128. Dipodomys Ordii, Woodhouse pll. v, xxi, fig, 1 ; pi. li, figg. 1 and 2 410 



129. Dipodomys Phillipu, Gray 412 



130. Dipodomys agilis, Gambel pi. ix, fig. 1 414 



34. PEROGNATHUS, Maxim. 



a. Perognathus, Max. 417 



131. Perognathus penicillatus, "Woodhouse pi. xx, fig. 5 418 



132. Perognathus fasciatus, Pr. Max 420 



133. Perognathus hispidus, Baird, n. s pi. li, fig. 4 421 



134. Perognathus monticola, Baird, n. a pl- li, fig- 3 422 



6. Cricetodipus, Peale. 418 



135. Perognathus fiavus,'Ba.m\,^.» pl. viii, fig. 2 ; pl. xxi, fig. 3 423 



136. Perognathus parvus, Leconte 425 



35. JACULUS, Wagler. 



137. Jaculus Hudsonius pl- xxi, fig. 5 430 



36. MUS, LiNN^US. 



138. Mus decumanus, Pallas 438 



139. Musrattus, L 439 



140. Mus tectorum, Savi pl- lii, fig. 6 441 



141. Miis miiscnlus, Linn 443 



37. REITHRODON, "Waterhousk. 



142. Peithrodon Iiumilis 448 



143. Pcithrodon montanus, V,aird, -a. H pl. liv, No. 1306 449 



144. Peithrodon mcgaiotis, B.nird, n. s 451 



145. Peithrodon lomjicauda, Baird, n. s 451 



