492 



BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



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

 350 mm.; tail Tertebrse, 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 bullae, 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. 



Remarlcs. ^Thia 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 

 pinetorum. 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 alhigula 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 hvllata. 



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

 Boundary 



NEOTOMA BELLA Bangs. 

 PRETTY WOOD-RAT. 



Neotomahella'BAsaa, Proc.New England Zool. Club, I, July 31, 1899, p. 66 (original 

 description). — Miller and Rbhn, 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 Coupty, California. 



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



