214 Merriam — Descriptions of Eigld New Pocket Gophers. 



Thomomys augularis 8)1. nov. 



Tijpe from Los Banos, Merced Co., California. No. 58123, r^ ad. TJ. S. 

 Nat. Wus., Biologioal Survey Coll. Collected Jan. 1, 18!)4, by J. E. Mc- 

 J.ellan. Ori<^iiial No. 418. 



General characters. — Size medium ; color grizzled fnlvou^, varying in in- 

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

 and differing in several characters ; upper incisors moderately produced. 



Color. — Upper j^arts 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 huffy ochraceous ; fore and 

 hind feet and tail whitish. 



Cranial characters. — .Skull large and massive ; braiucase 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 witli that of T. fulvm, is heavier, with 

 larger and more squarely spreading zygomata, more rounded interorbital 

 part of frontal s ; approximating temporal ridges ; larger ptei-ygoids, much 

 larger angular proce.sses of under jaw, and more prominent incisors. 



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

 hind foot, 32. 



Th3inomys mazima sp. nov. 



Type from Crater Lake, Mt. Mazama, Oregon. Exact locality, head of 

 Anna Creek; altitude, 6000 feet. No. 80502, J^ 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. monticolns Allen, but somewhat darker and diff"ering materially in 

 cranial characters. 



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

 vous l)rown ; under parts strongly washed with fulvous ; nose, end of 

 muzzle all round; small circle round eye; ear and i»ost-auricular spot 

 dusky ; fore and hind feet and tail whitish. 



Cranial characters. — Skull rather long and slender; similar to that of 7'. 

 monticolns Allen, but audital bullpe decidedly larger ; zygomata somewhat 

 more si)reading, and sulcus on inner side of upper incisor less marked. 



Meannrcineiiis. — Type specimen: total length, 214; tail vertebrae, 71 ; 

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

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



Thomomys quadratus sp. nov. 



T;/pe from The Dalles, Oregou. No. 57134, ^ 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. vm~ama and T. naxirns^ but 

 with a totally different skull. 



