VOL. XVI, PP. 25-28 MARCH 19, 1903 



PROCEEDINGS 



OF THB 



BIOLOGICAL SOCIETY OF WASHINGTON 



TWO NEW SPERMOPHILES FROM ALASKA. 

 BY WILFRED H. OSGOOD. 



In the light of recently secured material two forms of the 

 well-known Alaska ground squirrels or spermophiles appear 

 to be undescribed. Specimens of both forms have been in the 

 National Museum for some years, but the lack of material from 

 Hudson Bay and other important localities has heretofore 

 made it difficult to determine their relationships. For the 

 opportunity of describing these new forms and for the freedom 

 of the Biological Survey and National Museum collections I am 

 indebted to C. Hart Merriam and Gerrit S. Miller, Jr. 



Ci tell us* plesius ablusus, subsp. nov. 



Type from Nushagak, Alaska. No. 119,815, United States National 

 Museum, Biological Survey Collection, $ ad., September 16, 1902. W. 

 H. Osgood and A. G. Maddren. Original No. 2043. 



Characters. Similar to C. plesius\ but larger; adult in fall with the 

 hairs of the tail with at least two and often more annulations of black; 

 skull larger and heavier than that of plesius and slightly different in de 

 tailed characters; somewhat similar to C. parryi and C. barrowensis but 



*For use of the name Citettus instead of SpermopMus Cf. Allen, Bull. 

 Am. Mus. Nat. Hist. XVI, pp. 375-376, 1902. 



f Specimens now available indicate that C. plesius is entirely distinct 

 from C. parryi and the several long-tailed forms related to it. 



10 PBOC. BIOL. Soc. WASH. VOL. XVI, 1903. (35) 



