214 Merriam Descriptions of Eight New Pocket Gophers. 



Thomomys angularis sp. nov. 



Type from Los Banos, Merted Co., California. No. 58123, tf ad. U. S. 

 Nat. Mus., Biological Survey Coll. Collected Jan. 1, 1894, by J. E. Mc- 

 Lellan. Original No. 418. 



General characters. Size medium ; color grizzled fulvous, varying in in 

 tensity ; skull similar in general to that of T. fulvus, but more massive, 

 and differing in several characters ; upper incisors moderately produced. 



Color. Upper parts fulvous, grizzled with black tipped hairs, which 

 are most numerous on middle of back ; top of nose and ears blackish ; 

 under parts plumbeous strongly washed with buffy ochraceous ; fore and 

 hind feet and tail whitish. 



Cranial characters. Skull large, and massive ; braincase broad ; zygo 

 mata widely and squarely spreading ; jugals parallel ; temporal ridges 

 meeting in old age; nasals emarginate posteriorly; interorbital region 

 rounded ; angular process of mandible expanded and produced. The 

 skull of T. angularis, contrasted with that of T. fulvus, is heavier, with 

 larger and more squarely spreading zygomata, more rounded interorbital 

 part of frontals ; approximating temporal ridges ; larger pterygoids, much 

 larger angular processes of under iaw, and more prominent incisors. 



Measurements. Type specimen : total length, 257 ; tail vertebrae, 75 ; 

 hind foot, 32. 



Thomomys mazama sp. nov. 



Ti/pe from Crater Lake, Mt. Mazama, Oregon. Exact locality, head of 

 Anna Creek; altitude, 6000 feet. No. 80502, tf ad. U. S. Nat. Mus., 

 Biological Survey Coll. Collected Sept. 3, 1896, by E. A. Preble. Orig 

 inal No. 1485. 



General characters. Size rather small; color dull fulvous; similar to 

 T. monticolus Allen, but somewhat darker and differing materially in 

 cranial characters. 



Color. Upper parts from just in front of eyes to base of tail dull ful 

 vous brown ; under parts strongly washed with fulvous ; nose, end of 

 muzzle all round ; small circle round eye ; ear and post-auricular spot 

 dusky ; fore and hind feet and tail whitish. 



Cranial characters. Skull rather long and slender; similar to that of T. 

 monticolus Allen, but audital bullse decidedly larger ; zygomata somewhat 

 more spreading, and sulcus on inner side of upper incisor less marked. 



Measurements. Type specimen: total length, 214; tail vertebra, 71 ; 

 hind foot, 27.5. Average of 3 specimens from Crater Lake: total length, 

 214 ; tail vertebrae, 71 ; hind foot, 28. 



Thomomys quadratus sp. nov. 



Type from The Dalles, Oregon. No. 57134, tf ad. U. S. Nat. Mus., 

 Biological Survey Coll. Collected Nov. 2, 1893, by C. P. Streator. Orig 

 inal No. 3359. 



General characters. Externally similar to T. mazama and T. naxicu*, but 

 with a totally different skull. 



