MAMMALS OF THE MEXICAN BOUNDARY. 



471 



prominent, almost forming a l)ead, as in Sigmodon. The frontal bone 

 is expanded and depressed postorbitally. The nasals end in advance 

 of the intermaxillaries, and the upper molar series narrows rapidly 

 from before backward and has the anterior loop of the first molar un- 

 divided by a sulcus, much as in N. intermedia. The cranial variations 

 in this species, due to growth and individual differentiation, have been 

 treated of in a special paper" by Dr. J. A. Allen, who had at his com- 

 mand a splendid amount of material for the purpose and has furnished 

 mammalogists with very important data to aid them in making their 

 comparisons of other species of this and other genera. 



Remarks. — Specimens of tliis species from Fort Clark, Kinney 

 County, Texas, are rather paler in color and not quite so large as those 

 from Brownsville, Texas, though they are distinctly referable to the 

 typical form, which is replaced in the Eastern Desert Tract by the sub- 

 species canescens. 



Hahits and local distribution. — The home of the Texas wood-rat is in 

 the woods of Texas, usually near water. A female taken at Fort 

 Clark, Texas, January 13, 1893, would have produced three young. 

 Nests of this rat are commonly built about the roots of decayed trees 

 that are surrounded by thickets. 



Measurements of 6 specimens of Neotoma micropus. 



Locality. 



Fort Clark, Kinney County, Texas. 



.do 

 .do 

 .do 

 .do 

 .do 



■? ^ 



mm. 

 40.0 



37.0 

 40.0 

 40.0 

 39.0 

 38.0 



mm. 

 22.0 



26.0 

 22.0 

 23-0 

 22.0 

 22.0 



1 .\mpriean Museum of Natural History. 



NEOTOMA MICROPUS CANESCENS Allen. 



PALLID WOOD-RAT. 



Neotoma micropus canescens Allen, Bull. Am. Mus. Nat. Hi.st., Ill, No. 2, June 30, 1891, 

 p. 285 (original description). — Miller and Rehn, Proc. Bost. Soc. Nat. Hi.st., 

 XXX, No. 1, Dec. 27, 1901, p. 107 (Syst. Results Study N. Am. Mam. to the close 

 of 1900). 



Neotoma micropus, Merrl^.m, Proc. Acad. Nat. Sci. Phila., 1894, p. 244 (in part). 



[Neotoma] micropus, Elliot, Field Col. Mus., Zool. Ser., II, 1901, p. 155 (in part); 

 IV, 1904, p. 281 (part). 



a Bull. Am. Mus. Nat. Hist., VI, 1894, pp. 233-246, pi. iv. 



