. Bulletin - United States National Museum. Science. 398 BULLETIN 56, UNITED STATE8 NATIONAL MUSEUM. PEROMYSCUS SONORIENSIS MEDIUS (Mearns). SAN DIEGO PLAINS MOUSE. Peromyscus texanus medius Mearns, Proc. U. S. Nat. Mus., XVlII, 1896, p. 446 (p. 4 of advance sheet issued March '_'•"), L896; original description).—Miller and Rehn, Proc. Best. Soc. Nat. Hist., XXX, No. 1,Dec. 27,1901,p. 85 ( Study N. Am. Main, to close of 1900). SHomys americanus thurberi Allen, Bull. Am. Mus. Nat. Hist., V, Art. XII, AiiLr. 18, 1893, up. lSo, lS(i (in part). [Peromyscus texensis] medius, Elliot
. Bulletin - United States National Museum. Science. 398 BULLETIN 56, UNITED STATE8 NATIONAL MUSEUM. PEROMYSCUS SONORIENSIS MEDIUS (Mearns). SAN DIEGO PLAINS MOUSE. Peromyscus texanus medius Mearns, Proc. U. S. Nat. Mus., XVlII, 1896, p. 446 (p. 4 of advance sheet issued March '_'•"), L896; original description).—Miller and Rehn, Proc. Best. Soc. Nat. Hist., XXX, No. 1,Dec. 27,1901,p. 85 ( Study N. Am. Main, to close of 1900). SHomys americanus thurberi Allen, Bull. Am. Mus. Nat. Hist., V, Art. XII, AiiLr. 18, 1893, up. lSo, lS(i (in part). [Peromyscus texensis] medius, Elliot, Field Col. Mus., Zool. Ser., II, 1901, p. L3I (Synop. Mam. X. Am.). [Peromyscus] thurberi, Elliot. Field Col. Mus., Zool. Ser., IV, 1904, p. 176 (part) (Mam. Mid. Am.). Type-locality.—Nachoguero Valley, Lower California, near Monu- ment No. 238. (Type, skin and skull, Cat. No. 61059, U. S. National Museum.) Geographical range.—Sonoran and Transition zones of the Pacific Coast Tract. From the Coast Range to the Pacific. Description.—In the original description of this form it was said that "between the ranges of the subspecies gambettii and thurberi, both dark-colored races of Peromyscus sonoriensis, there is a narrow strip of southern and Lower California, bordering the Pacific Ocean for several hundred miles and extending east to the Coast Range of mountains, occupied by the present race, which differs from either of those above mentioned in being paler, with more drab and clay-colored tints. It is'smaller than P. s. gambettii, with much larger ears and a sonoriensisMKDiDs. shorter tail. Its paler, more ochraceous coloration at once distinguishes it from P. s. thurberi, with which it agrees in size. From P. s. deserticola of the interior deserts, it differs in being less robust and in having somewhat larger ears and much darker ; The upper surface is deep wood-brown, shading to russet on the cheeks, sides, and rump, and thickly mixed witli black abo
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