VOL. XIV, PP. 127-128 JULY 19, 1901 



PROCEEDINGS 



or THB 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTIONS OF THREE NEW KANGAROO MICE 

 OF THE GENUS MIC11O.1>IPO]>OP$. 



BY C. HART MERRIAM. 



Since the discovery of the genus Micmdipodojts* in East 

 Humbolek Valley, Nevada, in 1891, by Vernon Bailey, the ex 

 plorations of the IT. S. Biological Survey in adjacent territory 

 have resulted in not only extending the range of the original 

 species (megacephalus) but also in the discovery of three addi 

 tional forms, two of which appear to merit full specific rank. 

 These are here described. 



Microdipodops megacephalus oregonus subsp. nov. 



Tape from Lake Alvord, Alvord Desert, eastern Oregon. No. 80,128, 

 $ yg-ad., I'. S. National Museum, Biological Survey Collection. Au 

 gust IS, 181W. C. P. Streator. Original No. r>430. 



Characters.- Similar to megacephalus but tail longer; pelage less fluffy, 

 upperparls 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; skull smaller. 



Mtasurement*. Type specimen ($ yg-ad.): total length 1 .")); tail verte 

 bra- SS; hind foot 21. 



Microdipodops pallidus sp. uov. 



Type from 10 miles east of Stillwater, near Sink of the Humboldt and 

 Carson, Churchill County, Nevada. No. 93,520, 9 ad., U. S. National 

 22 BIOL. Soc. WASH. VOL. XIV, 1901. (127) 



