New Squirrels from Mexico and Central America. 147 



S. richmondi has a superficial resemblance to S. deppei,, but is darker and 

 the gray is replaced by fulvous or reddish-buffy. 



From S. ssstaans hoffmanni, to which it is most closely related, it may be 

 readily distinguished by the paler under surface, and especially by the 

 dull fulvous wash, instead of the rich bright rufous on the tail. The 

 general color of dorsal surface is much the same in both, and in intensity 

 of lower surface richmondi sometimes approaches closely to Uoffmanni. 

 The difference between the color edging the tail appears to be constant. 

 So far this species is known only from the lower Escondido River, above 

 Bluefields, Nicaragua, but it undoubtedly has a much wider range. It is 

 probable that when the intermediate country between the known ranges 

 of S. richmondi and & sestuans lioffmanni is worked they will be found to 

 intergrade, in which case S. richmondi will become a subspecies of S. ses- 

 tuans. This squirrel is named in honor of Dr. Chas. W. Richmond, As 

 sistant Curator of Birds in the U. S. National Museum, who collected the 

 series upon which the description is based. 



Sciurus negligens sp. nov. Tampico Squirrel. 



Type from Alta Mira, Tamaulipas, Mexico. No. 93028, 9 ad., U. S. 

 Nat. Mus., Biological Survey Coll. Collected April 18, 1898. by E. A. 

 Goldman. Orig. No. 12319. 



Distribution. State of Tamaulipas, Mexico (from Tampico to Victoria). 



Characters. Size of S. deppei, to which it is closely related. Above ful 

 vous-olive-gray ; below white, often shading to pale buffy posteriorly. 

 Forelegs and shoulders gray ; tail rather full, black, washed with white 

 on upper surface. 1 upper premolar. 



Color. Upper parts from nose to base of tail, including upper surface 

 of hind feet, finely grizzled black and pale olivaceous- fulvous, brightest 

 on flanks and thighs. Sides of head and neck dingy grizzled gray and 

 fulvous; ears slightly rufous; an indistinct ring of pale dull fulvous 

 around eyes. Lower surface white, nearly pure on chin, throat and 

 breast, becoming grayer or shaded with buffy posteriorly. Tops of fore 

 feet, forelegs and shoulders gray ; inside of legs paler gray ; a gray border 

 sometimes extending from forelegs back along flanks and side of hind 

 legs separating grizzled dorsal area from the paler lower surface. Anal 

 region and base of tail all round like back. Upper surface of tail black, 

 washed with white, the pale yellowish brown basal color showing through; 

 median band on under surface grizzled pale buffy and black, the buffy 

 predominating and bordered by a black band ; a thin edging of white 

 around border. Small patch of white and pale buffy fur behind base of 

 ears. 



Measurements. Type specimen: Total length 403; tail vertebrae 195; 

 hind foot 55. 



Sciurus alleni sp. nov. Allen's Squirrel. 



Type from Monterey, Tamaulipas, Mexico. No. ftffj-, cf ad., U. S. 

 Nat. Mus., Biological Survey Coll Collected Feb, 22, 1891, by C. ?, 

 Streator. Orig. No. 563. 



