334 



BULLETIN 56. UNITED STATES NATIONAL MUSEUM. 



underparts white. Tail above, grizzled grayish drab, mixed with blackish on the 

 terminal third and bordered with buffy; tail below, buffywith a submarginal black- 

 ish band, i North American Fauna, No. 4, p. 38. ) 



Tidbits and local distribution. —I first saw the Apache ground-squirrel 

 between Mountain Spring and the San Pedro River at Tres Alamos, 

 April 8, L885. A week later I met with it between Lordsburg, New 

 Mexico, and Alkali Flat to the westward, when crossing a series of 

 ridges covered rather scantily with the creosote bush (Oovillea triden- 

 tata), where the burrows of this species were abundant, and the ani- 

 mals themselves often seen and heard. It was abundant April 18 to 

 24, 1885, at Deming, New Mexico, living under mesquites. While 

 inarching from Lordsburg to Steins Pass, April 27, 1885, we found this 



FIG. 54. — ClTELL'JS 8PILOSOMA M ICROSPILOTUS. L.A NoKIA, SONORA, SEAR MONl/MKNT No. 112. (('AT. 



No. 35870, U.S.N. M.) o, Dorsal view; b, Ventral view; c, Lateral view. 



ground-squirrel abundant, and its lisping whistle was continually heard 

 as we passed by, The young were often seen during our march from 

 Steins Pass. New Mexico, to San Simon, Arizona. April 28, L885; and 

 tin animal was also observed on the plain east of Dragoon Summit, 

 on the Southern Pacific Railroad, Arizona. 



In following the Mexican Boundary Line we newer found this ground- 

 squirrel abundant except on the days when we crossed the San Simon 

 Valley. There it was continually seen running from one creosote 

 bush to another. 



