MAMMALS OF THE MEXICAN BOUNDAKY. 491 



was abundant at Flagstaff and San Francisco Mountain in 1886 and 

 1887, when it was also found at Quaking Asp Settlement on the 

 ^Mogollon Mesa. I never obtained any of the rats from the large nests 

 so abundant in the red juniper trees of northern Arizona, and do not 

 know whether they were made hy this or some other species of wood 

 rat. Doctor Bishop collected the pine wood-rat at Bill Williams 

 Mountain, Arizona, in 1883. 



NEOTOMA MEXICANA Baird. 

 CHIHtTAHUA WOOD -RAT. 



Neofoma mexicana Baird, Proc. Acad. Nat. Sci. Phila., VII, 1855, p. 33.3 (near Chihua- 

 hua, Mexico: original description). — Merriam, Proc. Acad. Nat. Sci. Phila., 1894, 

 p. 245. — Miller and Rehn, Proc. Bost. Soc. Nat. Hist., XXX, No. 1, Dec. 27, 

 1901, p. 106 (Syst. Results Study N. Am. Mam. to close of 1900). 



[Neotoma] mexicana, Elliot, Field Col. Mus., Zool. Ser., II, 1901, p. 1.58 (Synop. Mam. 

 N. Am.): IV, 1904, p. 282 (Mam. Mid. Am.). 



Type-locality. — Mountains near Chihuahua, Mexico. 



Geographical range. — Tops of the desert ranges of the Chihuahuan 

 region, extending into the United States in southwestern Texas and 

 southeastern New Mexico. 



Description. — Size, small. Length, 335 mm.; tail vertebrae, 150; 

 hind foot, 35; ear from crown, 22; skull, 42 by 20.5. Color of upper 

 side of body pale ochraceous buff mixed with gray and black; head 

 and legs, grayish; underfur plumbeous; under surface of head and 

 body, feet, and under side of tail white. 



Cranial and dental cliaracters. — Skull with front loo]) of first upjjcr 

 molar completely divided by a deep sulcus formed by the infolding of 

 the enamel, exactly as in Neotoma pinetorum. Nasal bones broad, 

 often truncate posteriorly, ending evenly with the premaxillaries 

 behind. Orbital margin upturned and forming a distinct crest. 



NEOTOMA MEXICANA BULLATA Merriam. 

 APACHE WOOD-RAT. 



Neotoma mexicana huUata Merriam, Proc. Biol. Soc. Wash., IX, p. 120, July 2, 1894 

 (Santa Catalina Mountains, Arizona; original description); Acad. Nat. Sci. 

 Phila., 1894, p. 245.— Miller and Rehn, Proc. Bost. Soc. Nat. Hist., XXX, No. 1 , 

 Dec. 27, 1901, p. 107 (Syst. Results Study N. Am. Mam. to close of 1900). 



{Neotoma mexicana^ bnUata, Elliot, Field Col. Mus., Zool. Ser., II, 1901, p. 158 

 (Synop. Mam. N. Am.). 



Type-locality. — Santa Catalina Mountains, Arizona. (Type, skin 

 and skull, Cat. No. gfff I, U. S. National Museum, Biological Survey 

 collection.) 



Geographical range. — Transition Zone, on mountains of the Elevated 

 Central Tract, in places touching the lower edge of the Boreal Zone. 



Description. — Similar to typical Neotoma mexicana, but darker, 

 with peculiar audital bulla^. Above clay color, grayish on head and 

 limbs, thickly lined with l)lack-tipped hairs; sides buffy; underfur 



