Merriant Xw Species of Thomomys. Ill 



sides of mouth dusky; chin white; underparts salmon. Nasals broader 

 posteriorly than in aureus. 



Measurement*, Type specimen ( $ ad.): total length 244; tail vertebrae 

 76; hind foot 31. Average of 2 males from type locality: total length 

 245; tail vertebra 73; hind foot 32. 



Thomomys aureus perpes subsp. nov. 



Type from Lone Pine, Owens V r alley, California. No. liBo.*, $ ad., 

 U. S. National Museum, Biological Survey Collection. December 23, 

 1890. E. W. Nelson. Original No. 145. 



Characters. Size rather small; color buffy yray, in summer becoming 

 more buff y .fulvous. 



Color. Upperparts butty gray, darkest on head and nose, palest and 

 with strongest butt'y suffusion on sides; underparts, feet, and tail buffy 

 whitish. Summer specimens are more buffy fulvous like aureus, 



Cranial characters. Skull similar in general to the smaller specimens 

 of oni'eux, but decidedly shorter and with much smaller bulhe. 



Measurements. Type specimen ( $ ad.): total length 215; tail verte 

 bra 1 05: hind foot 28. Average of 10 adults from type locality: total 

 length 212; tail vertebra 66; hind foot 28.5. 



Thomomys angularis pascalis subsp. nov. 



Type from Fresno, San Joaquin Valley, California. No. ff f|, $ ad., 

 U. S. National Museum, Biological Survey Collection. May 4, 1892. 

 C. P. Streater. Original No. 1634. 



Characters. Similar to angularw but smaller; upperparts less fulvous 

 (more buffy yellowish); underparts very much paler and often marbled 

 irregularly with patches of white; wrists and ankles usually white: 

 ears smaller and dusky; earpatch obsolete or nearly so. Skull smaller 

 and smoother; the temporal ridges not uniting to form a sagittal crest; 

 interorbital constriction less marked; bulhe larger; angle of under jaw 

 smaller. 



Measurements. Type specimen ( $ ad.): total length 230; tail verte 

 brae 80: hind foot 32. Average of 4 males from type locality: total 

 length 212.5; tail vertebras 715; hind foot 30.5. Average of 4 females 

 from type locality: total length 195; tail vertebrae 63; hind foot 28. 



Thomomys fuscus fisheri subsp. nov. 



Type from Beckwith, Sierra Valley, Plumas County, California. No. 

 101,238, $ ad., U. S. National Museum, Biological Survey Collection. 

 August 3, 1900. Walter K. Fisher. Original No. 1547. 



('lmr<ict?rx.- Similar to fuse us but upperparts very much paler; gray 

 ish brown instead of dull fulvous brown. 



Cranial <'liar<ti'l<i'x. -Skull similar to that of fuscus but shorter; xygo- 



