380 BULLETIN 56, UNITED 8TATES NATIONAL MUSEUM. ' 



Rccovil mid, iiif'<i.'<urfiiiriifs nf IS xiu-fimiiix nf ('iti-Iiiis nif.ricaiuix /xirrldeiis. 



"Iris hazel. Type. 

 ''Head and hodv, 180 mm. 



"Head and body, 143mm. 



rf Collected by Louis di Zerega Mearns. 



Subgenus XEKOSPERMOPHILUS Merriam. 



XeroHpermopJrihis Mehkiam, Proc. Biol. Soc. Washington, VII, p. 27, Apr. 13, 

 1893 (original description). — Elliot, Field Col. Mus., Zool. Ser., II, 

 1901, p. 95 (Synop. Mam. N. Am.); IV, 1904, p. 143, fig. 25 (Mam. Mid. 

 Am.). — Miller and Rehn, Proc. Bost. Soc. Nat. Hist, XXX, No. 1, Dec. 27, 

 1901 p. 4(i, footnote (Syst. Results Study N. Am. Mam. to close of 1900). 



Character.s. — Small-sized, slender oround-squirrels, usually having 

 the tail less than half the length of the head and bod}-. Skull short, 

 broad, and highly arched; broad interorbitalh^; rostrum short; nasals 

 broad; audital bull* v^er}^ large; and postpalatal notch long- and narrow. 



