230 BULLETIN OF THE 



diana by Prince Maximilian is added * there are besides the several doubt- 

 ful ones already mentioned, others equally questionable. Of those assigned 

 to that part of the United States east of the Rocky Mountains, the 7/. 

 michiganensis, II. leucopus, and H. NuttaUii (aureolas Aud. and Bach.), 

 seem to be those best entitled to recognition, while possibly II. gossypinus 

 may be also valid ; but with my present knowledge of the subject, I fail to 

 see why II. texanus, H. indianus (of Prince Maximilian), H. sonoriensis, 

 H. myoides, and II. cognatus, should be thus regarded, all but the latter, 

 and perhaps also both this and //. gossypinus, being apparently referable 

 to II. leucopus. I do not hesitate to thus refer II. sonoriensis, and II. myoi- 

 des, both of which I have examined in the fresh state, and numbers of 

 the latter th.it were preserved in alcohol. 



Of the Pacific Coast species, of which at least five have been described, 

 several are intimately allied to the H. leucopus of the East, as well as to 

 each other. Whether any of them are identical with II. leucopus is not at 

 present, from want of sufficient material, easy to decide. Should they prove 

 to be so, it would substantiate a more extended geographical range for H. 



* 1. Hesperomys leucopus Baird, N. Am. Mam., 1857,459: = Musculus leucopus Raff., 

 Amer. Monthly Mag., Ill, 1823, 307. 



2. Hesperomys myoides Baird, N. Am. Mam., 472; = Cricelus myoides Gappek, Zobl. 

 Journ., 1830, 204. 



3. Hesperomys indianus Maximilian, Archiv fur Naturgesch., XVIII, 1, 1862, 111. 



4. Hesperomys sonoriensis LeConte, Proc. Phil. Acad. Nat. Sci., VI, 1853, 413; = H. 

 sonoriensis Baird, N. Am. Main., 474. 



5. Hesperomys texanus Woodhouse, Proc. Phil. Acad. Nat. Sci., VI, 1853, 242; = H. 

 texanus Baird, N. Am. Mam., 464. 



6. HesperorAys NuttaUii Baird, N. Am. Mam., p. 467; = ? Arvicola NuttaUii Harlan, 

 Month. Amer. Journ., 1832, 446; = Mus ( Calomys) aureolus Aud. and Bach., Jour. Phil. 

 Acad. Nat. Sci., VIII, 1842, 302. 



7. Hesperomys cognatus LeConte, Proc. Phil. Acad. Nat. Sci., VII, 1855, 442; = H. 

 cognatus Baird, N. Am. Mam., 469. 



8. Hesperomys gossypi?ius LeConte, Proc. Phil. Acad. Nat. Sci., VI, 1853,411; = H. 

 gossypinus I5aii:d, N. Am. Mam., 469. 



9. Hesperomys Boyhi Baird, Proc. Phil. Acad., VII, 1855, 335; = Ibid., N. Am. 

 Mam., 471. 



10. Hesperomys californicus Baird, N. Am. Mam., 478; = Mus californicus Gambel, 

 Proc. Phil. Acad. Nat. Sci., IV, 1848, 78. 



11. Hesperomys eremicus Baird, N. Am. Mam., 479. 



12. Hesperomys austu-us Baird, Proc. Phil. Acad. Nat. Sci., VII, 1855, 336; = Ibid., 

 N. Am. Mam., 466. 



13. Hesperomys Gambelii Baird, N. Am. Mam., 464. 



14. Hesperomys michiganensis Wagner, Archiv fur Naturgesch., 1848, 2, 51; = Mus 

 michiganensis Aud. and Bach., Journ. Phil. Acad. Nat. Sci., VIII, 304; = //. michigan- 

 ensis Baird, X. Am. Mam., 470; = Mus Baird'u IIov & Kbmwcott, Patent-Office 

 Rep., Agr., 1850 (1857), 92. 



