270 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



color often showiii!; tlirougli : lielow 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, bnff.v. or 

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

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

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



Measiircinoits. — Average of five adults from vicinity of type locality : Total 

 length, 471; tail vertebme, 217; hind foot, (JO.C). Average of five adults from 

 mountains near ^liquihuana, Tamaulipas : Total length, 405 ; tail vertebra\ 

 230.4 ; hind foot, 05.8. 



Cruniul c//fl/TW'*«i>. —Premolars \. Skulls gf 8. alJcni are only distinguish- 

 able from those of .S'. ocuhitiis by their smaller size. Five adult skulls from 

 region of type locality average; Basilar length, 50.4; i»alatal length, 20.3; inter- 

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

 10.5. Five adult skulls from near Mi(iuihuana average : Basal length, 50 ; 

 palatal length, 25.0: interoi'bital breadth, 18.1; zygomatic breadth, 33.7; length 

 of upper molar series, Kl.3. 



General notes. — >S'c/»/».s' ulleiii bears a close superficial resemblance ' to »S'. 

 curoliiieii.si.s of Texas, but has only a single premolar. From vS\ o tohtar it dif- 

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

 species came from near ^Monterey. Xuevo Leon. By a slip of the pen in the 

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

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

 UnensiH??" and gave the essential characters which separate it from »S'. caro- 

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

 arizmiensis, but a series in the c*olleetion of the biological survey shows that it 

 is a well-defined species most nearly related to /S'. oeitlatus. Neither »S'. caro- 

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



SpcchHGus examined. — Twenty-two: from Monterey, Linares, Bio de San 

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

 Tamaulipas. (Proc. Wash. Acad. Sci., I, 1809, j). 91.) 



Among my old notes I find the following : 



It is not improbable that another species of Seitinis inhabits the Mexican 

 line in the Texan region. Under the head of " Heiiinis arizonen.si.^ Coues," Dr. 

 J. A. Allen mentions « the receipt of a s(|uirrel from Texas which " in all fea- 

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

 {8ciirn(s carolhiensis), the species that would be naturally expected to occur in 

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

 ]»resent 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 sijecimen from Texas, hut the one from the San 

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



SCIURUS APACHE Allen. 

 APACHE SaUIRREL. 



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



8. griseofiavKfi Gray, 1807). 

 Sciurus niger JudorieUinus. Thomas, Proc. Zool. Soc, London, 1890, p. 78, 



footnote. 



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



