Vol. XIV, pp. 127-128 July 19, 1901 



PROCEEDINGS 



or THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTIOXS OF THREE XEW KAX(4AR0() MICE 

 OF THE GENUS MICnODTPOTiOPS. 



BY C. ITAKT MERRIAM. 



Since tlio discovery of the o'enus ^ficroJlpodopH* in East 

 Hiunboklt \'alley, Nevada, in 18'Jl, by Vernon Bailey, the ex- 

 j>h)rations ol' the U. S. IJiohigieal Survey in adjacent territory 

 have resulted in not only extending the range of the original 

 species [megacep/tahtti) but also in the discovery of three addi- 

 tional forms, two of wliich appear to merit full s})ecitic rank. 

 These are here described. 



Microdipodops megacephalus oregonus subsp. nov. 



2)/p(' I'l-om Lake Alvord. iVlvord Desert, eastern (Oregon. No. 80,128, 

 $ yji-ad., U. S. National Museum, Biological Survey Collection. Au- 

 o'list 18. 181)(). C. P. Streator. Orig-inal No. .14^0. 



CJiamrters. — Similar to nieg((cephalus but tail loiiffer; pelage less fluffy, 

 upperparts more olivaceous and less conspicuously lined with black-tip- 

 ped hairs; underparts white — buffy wash less marked; a whitish streak 

 usually present along under side of tail; skvdl smaller. 



Measurements. — Type specimen ((^ yg-ad.): tolal lenglh l.i:!; tail \erle- 

 bra; 88; hind foot 24. 



Microdipodops pallidas sp. 



nov. 



2]ipe from Id miles east of Stillwater, near Sink of the Humboldt and 

 Car.son. Churchill County, Nevada. No. !)3,.")20. 9 ad., U. S. Natioaal 

 32— Biol. Soc. Wash. Vol. XIV, 1901. (127) 



