. Mammals of the Mexican boundary of the United States : a descriptive catalogue of the species of mammals occurring in that region; with a general summary of the natural history, and a list of trees . Mammals; Mammals; Trees; Trees; Natural history; Natural history. MAMMALS OF THE MEXICAN BOUNDARY. 385 Peromyscus leucopus sonoriensis, Allen, Bull. Am. Mus. Nat. Hist., VII, p. 229, June 29, 1895 (in sriiall part). [Peromyscus texanus] sonoriensis, Mearns, Proc. U. S. Nat. Mus., XVIII, 1896, p. 446. [Peromyscus americanus] sonoriensis, Elliqt, Field Col. Mus., Zool. Ser., II, 1901, p. 125 (Syno


. Mammals of the Mexican boundary of the United States : a descriptive catalogue of the species of mammals occurring in that region; with a general summary of the natural history, and a list of trees . Mammals; Mammals; Trees; Trees; Natural history; Natural history. MAMMALS OF THE MEXICAN BOUNDARY. 385 Peromyscus leucopus sonoriensis, Allen, Bull. Am. Mus. Nat. Hist., VII, p. 229, June 29, 1895 (in sriiall part). [Peromyscus texanus] sonoriensis, Mearns, Proc. U. S. Nat. Mus., XVIII, 1896, p. 446. [Peromyscus americanus] sonoriensis, Elliqt, Field Col. Mus., Zool. Ser., II, 1901, p. 125 (Synop. Mam. N. Am.). Peromyscus texanus sonoriensis. Miller and REHN,Proc. Bost. Soc. Nat. His., XXX, No. 1, Dec. 27, 1901, p. 86 (Syst. Results Study N. Am. Mam. to close of 1900). [Peromyscus] leucopus sonoriensis, Elliot, Field Col. Mus., Zool. Ser., IV, 1904, p. 181 (Mam. Mid. Am.). Type-locality.—Santa Cruz, an old Mexican town, on the Santa Cruz River, in Sonora, about 6 miles south of Monument No. Ill, Mexican Boundary Line. (Type, skin and broken skull, Cat. No. tWs; U. S. National Museum.) Geographical range.^-Sonorsin Zone of the Elevated Central Tract. Along the waters of the Gila River and its tributaries. Le Conte, in his original description of this race, states " that it was "collected by the Boundary Commission, under Major Graham;" and Professor Baird. a be Fig. 70.—PEEOMYScua sonoriensis. u, dorsal view of skull: 6, crowns of lower molars; t, CROWNS of upper MOLARS. tells us*" it was "characterized as H. sonoriensis by Major LeConte from specimen 146 of the Smithsonian ; The skin and skull of this specimen, labeled "Hesperomys sonoriensis" in'^hat is supposed to be Le Conte's handwriting, which is undoubtedly the type of Hesperomys sonoriensis Le Conte, and has always been so consid- ered, are now before me. I have compared this type with topotypes which I collected at the town of Santa Cruz and at other place


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