Vol. XVIII, pp 163-166 June 29, 1905 



PPxOCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



- ;i>-. 



t'^^/'^AS'^ 



TWO NEW CHIPMUNKS FROM COLORADO AND ARIZONA. 



BY C. HART MERRIAM. 



Both of the chipmunks here descrihecl are of unusual interest. 

 One inhal)its the pinyon and juniper helt in the desert region of 

 northeastern Arizona and southeastern Utah, and is one of the 

 handsomest memliers of the genus ; the other is the common 

 small chipmunk of the high mountains of Colorado ; it has been 

 previously confused with quodrivittatus of ^ay, which proves to 

 be a much larger species. The specimen on which Say's species 

 was l)ased was collected l)y Long's Expedition to the Rocky 

 Mountains on July 17 or 18, 1830, on the Arkansas River. The 

 party, which included the naturalist Thomas Say, was encamped 

 from the evening of July 16 to the morning of July 19, at a 

 locality described as al)out thirty miles below " the place where 

 the river leaves the niduntains," which would be about 26 miles 

 below tlu' present Canyon City. Referring to this camp, Say 

 states, "Among the animals taken here, was the four-lined 

 squirrel (S. /ji-v/Unhis) a ver}' small and handsome species." 

 This fixes the type locality with a definiteness not open to 

 question. 



Recent field woi-k in eastern Colorado shows that two species 

 of chipmunk occur in the region, one inhabiting the Boival zone 

 in the liigh mountiiins, the other the Transition and Upper 

 Sonoran foot hills, extending out toward the plain as far as the 

 land is covered with a scattered growth of junipers. The 



28-Pkuc. BiuL. Soc. Wash., Vol. XVIII, 1906. (163) 



