270 BULLETIN 56, X7NITED STATES NATIONAL MUSEUM. 



color often showing through; below with broad median area of grizzled yel- 

 lowish brown or yellowish gray, narrowly bordered with black and edged with 

 white. Hairs of back black, with one and often two rings of gray, huffy, or 

 buffy brown, the two colors sometimes on same hair and sometimes on distinct 

 hairs. The pelage in summer is darker and more yellowish brown than in 

 winter, due to absence of most of the gray or white tips to hairs. 



3Icasiircments. — Average of five adults from vicinity of type locality: T&tal 

 length, 471; tail vertebra>, 217; hind foot, 60.6. Average of five adults from 

 mountains near Miquihuana, Tamaulipas: Total length, 405; tail vertebrte, 

 230.4 ; hind foot, 65.8. 



Cranial c/toractfli>-. —Premolar.'? |. Skulls of S. aUenl are only distinguish- 

 able from those of 8. oculatus by their smaller size. Five adult skulls from 

 region of type locality average : Basilar length, 50.4 ; palatal length, 26.3 ; inter- 

 orbital breadth, 18.4; zygomatic breadth, 33.7; length of upper molar series, 

 10.5. Five adult skulls from near Miquiliuana average: Basal length, 50; 

 palatal length, 25.0 ; interorbital breadth, 18.1 ; zygomatic breadth, 33.7 ; length 

 of upi)er molar series, 10.3. 



General notes. — Sciwrus aUcni bears a close superficial resemblance to 8. 

 carolincnulu of Texas, but has only a single jjremolar. From 8. o toUicrr it dif- 

 fers mainly in smaller size, grayer feet, and whiter belly. The type of this 

 species came from near Monterey, Nuevo Leon. By a slip of the pen in the 

 original description the type locality was given as Jlonterey, Tamaulipas. 

 Baird called attention to this squirrel in 1857, under the name "Scinrus caro- 

 Unensis? ?" and gave the essential characters which separate it from S. caro- 

 Uncnsls. Subsequent authors have referred it to the same species, or to 8. 

 arizonensis, but a series in the collection of the biological survey shows tha-t it 

 is a well-defined species most nearly related to 8. oculatus. Neither 8. caro- 

 Itnensis nor any close relative of that species occurs in Mexico. 



8pecimens ei-aniinvd. — Twenty-two : from Monterey, Linares, Rio de San 

 Juan, and San Pedro mines, Nuevo Ijcon ; near Victoria and Miquihuana, 

 Tamaulipas. (Proc. Wash. Acad. Sci., I, 1899, p. 91.) 



Among my old notes I find the f oUoAving : 



It is not improbable that another species of Sciuriis inhabits the Jlexicaii 

 line in the Texan region. Under the head of " Sciurus arizonensis Coues," Dr. 

 J. A. Allen mentions " the receipt of a squirrel fi'om Texas which " in all fea- 

 tures of coloration resembles a common phase of the southern gray squirrel 

 (Sciurus oarolinetisis) , the species that would be naturally expected to occur in 

 Bee County, but the skull lacks all trace of the small premolar almost invariably 

 present in this species." He also mentions a similar specimen from the San 

 Pedro mines, Nuevo Leon, Mexico, collected by Mr. J. M. Priour. 



I have not seen the specimen from Texas, Rit the one from the San 

 Pedro mines, Nuevo Leon, is certainly the present species. 



SCIURUS APACHE Allen. 

 APACHE SatmiREL. 



Sciurus griseoflavus Thomas, Proc. Zool. Soc, London, 1882, p. 372 (not 



S. griseoflavus Gray, 1867). 

 Sciurus niger ludovicianus, Thomas, Proc. Zool. Soc, London, 1890, p. 73, 



footnote. 



a Bull. Am. Mus. Nat. Hist., Ill, 1891, p. 222. 



