^[(■rrbiiii — -Xcii' SjircifK of 'rii(UiK>lin/s. 11.") 



Color. — Fpperparts (including- tail) briiiht ochraceous, varjing from 

 butfy fulvous 1o brii;'li1 oran.ue fulvous: dark nose patch usually reach- 

 ing up to be! wecii oyps and often to between ears: underparts \ arying' 

 from buffy to salmon fulvous: cliin usually dusky: feet whitish: ear- 

 patch dark. 



Cranial characters. — Skull very small, much smaller than fulru.'^; zyp-o- 

 mata stronj^ly bowed outward the anterior anuie marked: interparietal 

 subcjuadrate, broader than lonu: nasals nolchnd at hinder end, not 

 reachint;- near ends of pr<Mnaxill;e: bulhe lari^c and swollen. 



Thomomys pygmgeus s\). nov. 



Ti/pe fromilontpelier Creek, hlalio (alt. (ilOO ft.). No. .")."). 271. $ ad.. 

 U. S. National Museum, Biolo<jical Survey Collection. July 29, 189:5. 

 Vernon IJailcy. Oriyinal No. 11-")!). 



Chnraderx. — Size smallest of the known s])('cies: feet vei'v small: color 

 dark: skull sub-cylindrical. 



Color. — Upperparls dark rnfus brown: undcrjiarts buffy fulvous, the 

 dark underfur showiiiu- ihrouiih: nose dusky: feet whitish. 



Cninial character.^. — Skull similar in neiiei'al to thai of idolioensis but 

 much smaller: braincase moi'e cylindrical: interparietal larger and 

 Iransversidy o\al: nasals short, rather broad and emar.i^inate at posterior 

 end: Inilhr strikingly smaller: teeth lar.ije — relatively larger than in 

 idahocns'is. 



Mrtixiirriiii'ids.' Ty\n' specimen {$ ad.): total len.i:1 h Ki: tail Ncrle- 

 brfe 4(): hind fool 2'i. Another male from type locality: total Icn.iilh 

 1(5.>: tail \(M-Ielir;e K); hind foot ^H. 



Thomomys douglasi oregonus subsp. no\ . 



Type from Oregon City. AVillamettc \'alley, Orci^on. No. .")(),9:!9. $ 

 ad., V. S. National Museum, l>iolo<iical Survey Collection. October 24. 

 1893. C. P. Sireator. Original No. :j:54(). 



Characters. — Externally like dovglasi, but usually lackiiii;- the while 

 spot on breast. 



Cranial characters. — Compared with doaglasi the zygomata are largei' 

 and much more broadly bowed outirard and rounded, the outer sides parallel 

 instead of diverging anteriorly: nasals narrower posteriorly but sides 

 straight as in doaglasi; interparietal decidedly larger and longer antero- 

 posteriorly. subtriangular instead of transversely oval, with posterior 

 margin straight and not encroaching on supraoccipital: bulhe more 

 swollen: pterygoid notch V-shaped instead of I'-shaped. 



Measurements. — Type specimen ( <? ad.): total length 2"2(»: tail vertebne 

 70: hind foot 30. iVverage of 10 adults from type locality: total length 

 213; tail vertebne G().o; hind foot 29. 



