270 BULLETIN 56, CTNITED STATES NATIONAL MUSEUM. 



color often showing through; below with broad median area <>l' grizzled yel- 

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

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

 huffy 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, duo to absence of most of the gray or white tips to hairs. 



Measurements. Average of live adults from vicinity of type locality: Total 

 length, 171: tail vertebra?, 217; hind fool. 60.6. Average of rive adults from 

 mountains near Miquihuana, Tamaulipas: Total length, 465; tail vertebrae, 

 230.4 ; hind foot. 65.8. 



Cranial character*.- Premolars j. Skulls of n. alleni 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 Miquihuana average: Basal length, 50; 

 palatal length, 25.6; interorbital breadth, 18.1; zygomatic breadth, .".."..7: length 

 of upper molar series. 1(>..">. 



General notes. -Sciurus alleni bears a close superficial resemblance to 8. 

 carolinensis of Texas, hut has only a single premolar. From S. <> tallica' 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 Monterey, Tamaulipas. 

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

 linensis? t" and gave the essential characters which separate it from 8. caro- 

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

 arizonensis, hut a series in the collection of the biological survey shows that it 

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

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



Specimens examined. — Twenty-two: from Monterey, Linares. Rio de San 

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

 Tamaulipas. (Proc. Wash. Acad. Sci., 1. 1809, p. 91.) 



Among my old notes I find the following: 



It is not improbable that another species < f Sciurus inhabits the Mexican 

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

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

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

 (Sciurus carolinensis), the species that would he naturally expected to occur in 

 Bee County, hut 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, hut the one from the San 

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



SCIURUS APACHE Allen. 

 APACHE SQUIRREL. 



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



n. griseoflavus Gray, 1807). 

 Sciurus niger ludovicianus, Thomas. Proc. Zool. Soc, London. 1890, p. 7.'!. 



footnote. 



a Bull. Am. Mas. Nat. Hist.. HI. L891, p. 222, 



