Descriptions of Six New Rodents. 21 



Aplodontia major rainier! subsp. nov. 



Type from Paradise Creek, south side Mt. Rainier, Washington (alt., 

 5200 ft.). No 90144 $ ad. U. S. Nat. Mas., Biological Survey Coll. Col. 

 lected August 6, 1897, by Vernon Bailey. Orig. No. 6122. 



Character*. Similar to A. major but paler and grayer throughout, par 

 ticularly the underparts and region around mouth ; whiskers mainly 

 white instead of black ; audital tubes smaller; incisive foramina shorter 

 and slightly more open ; basioccipital notch shallower ; jugal narrower 

 and more slender throughout. 



Measurements. Type specimen: Total length 375 ; tail vertebrae 33; 

 hind foot 62. 



Thomomys melanops sp. nov. 



Type from timberline at head of Soleduc River, Olympic Mts., Washing 

 ton. No. 90630 9 ad. U. S. Nat. Mus., Biological Survey Coll. Col 

 lected Aug. 28, 1897, by Vernon Bailey. Orig. No. 6219. 



Characters. Size small ; coloration as in T. mazama nose, space round 

 eye and large postauricular patch (embracing ear) slate black in strong 

 contrast to dull chestnut of upper parts; under parts dark plumbeous, 

 washed with buffy fulvous ; feet and wrists white. T. douglasi from the 

 north side of the Columbia River has the entire head reddish chestnut 

 concolor with the back, but in cranial characters agrees best with the 

 present species. 



Cranial character*. Skull similar to that of douglasi but smaller; inter. 

 parietal shorter posteriorly, barely notching supraoccipital ; mastoid 

 bullse smaller: basioccipital less excavated by audital bullre; anterior 

 root of zygoma (seen from above) broader and more squarely truncate, 

 infringing more on frontals. 



Measurement*. Type specimen: Total length 206; tail vertebrae 63; 

 hind foot 27. 



Thomomys douglasi yelmensis subsp. nov. 



Type from Tenino, Yelm Prairie, Washington. No. fif^f $ ad. U. S. 

 Nat. Mus., Biological Survey Coll. Collected Oct. 24, 1891, by C. P. 

 Streator. Orig. No. 1385. 



Characters. Similar to T. douglasi but very much paler; face with the 

 dark markings of the mountain species. 



Cranial characters. Skull like that of douglasi but interparietal larger; 

 frontals depressed interorbitally ; angle of mandible standing out farther 

 and projecting anteriorly so as to form a distinct hook ; incisors broader 

 and thicker. 



Measurements. Type specimen: Total length 222; tail vertebrae 68; 

 hind foot 32. 



