492 



BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



plumbeous; feet and under suf ace white. Mammae, 2 pairs. Length, 

 350 mm.; tail vertebrae, 175; hind foot, 35; ear from crown, 20; skull, 

 44 by 21. 



Cranial and dental characters. — The anterior loop of the first upper 

 molar is completely divided by an infolding of the enamel. The nasals 

 are truncate posteriorly and end flush with the premaxillaries behind. 

 The orbital rim is elevated and sharp, making the interorbital portion 

 of the frontal bone strongly concave longitudinally, and the interptery- 

 goid space is narrow. As noted by Merriam, the audital bulla?, which 

 are rather small, are sometimes "curved toward median line anteriorly 

 in a manner not observed elsewhere in the genus;" but this pecul- 

 iarity is by no means constant. 



RemarTcs. — This slightly marked race occupies the spruce and pine 

 zones on the mountains southwest of the Colorado Plateau, in the latter 

 region being replaced by a larger but closely allied species, Neotoma 

 jnnetorum. On the Mexican Line we found it only on the highest por- 

 tions of the San Luis and Huachuca mountains. Externally it is very 

 similar to Neotoma intermedia nlhigula of the same region, but may be 

 distinguished by its smaller size and more grayish head." 



Record and measurements of 8 specimens of Neotoma mexicana hullata. 



1001 

 1033 

 1034 

 1036 

 1037 

 1042 

 1043 



Locality. 



San Luis Mountains. 



Huachuca Mountains, Arizona. 



do 



do 



do 



do 



do 



do 



Date. 



1892. 

 July 18 



1893. 

 Sept. 1 

 Sept. 14 

 Sept. 15 

 Sept. 18 

 Sept. 19 

 Sept. 20 

 Sept. 21 



Sex and 

 age. 



9 ad. 



cf ad. 

 ?ad. 

 $ad. 

 (fad. 

 9 im. 

 cf ad. 

 9 ad. 



mm. 

 325 



343 

 234 

 322 

 351 



mm. 

 160 



162 

 169 

 164 

 176 



317 

 334 



155 

 169 



mm. 

 36.0 



34.0 

 32.0 

 32.0 

 33.0 



32.0 

 33.0 



mm. 

 22.0 



20.0 

 20.5 

 20.0 

 20.0 



18.0 

 20.0 



a The following two species have been described from localities not far from the Mexican 

 Boundary 



NEOTOMA BELLA Bangs. 



PRETTY WOOD-RAT. 



iVeotoma ieZZa Bangs, Proc. New England Zool. Club, I, July 31, 1899, p. 66 (original 

 description). — Miller and Reun, Proc. Boston Soc. Nat. Hist., XXX, No. 1, 

 Dec. 27, 1901, p. 101 (Syst. Results Study N. Am. Mam. to close of 1900).— 

 Elliot, Field Col. Mus., Zool. Ser., II, 1901, p. 429 (Synop. Mam. N. Am.). 



The original description of this rat by Mr. Bangs is as follows: 



Type-locality. — Palm Springs, Riverside County, California. 



General characters. — Belonging to the intermedia-lepida group. Size larger than N. lepida 



