130 



NORTH AMERICAN FAUNA. 



[NO. 39. 



present little brown form. There were no notes to indicate whether 

 the two species occupy the same or separate areas. 



In the type specimen the upper molars are abnormally close to- 

 gether at the anterior base, but this is probably not characteristic of 

 the species. Unfortunately there are no skulls for the Moose Moun- 

 tain specimens, but the skins match the type in color. They are 

 both breeding females collected July 2 by W. Spreadborough and are 

 particularly interesting in showing fully developed sets of 12 mammae 

 each; inguinal 2-2, abdominal 2-2, pectoral 2-2. This is the formula 

 for the talpoides and not for the fuscus group. The status of the form 

 is at present very uncertain and will be until more collecting is done 

 in the type region. 



Specimens examined. — Total number, 3, as follows: . 

 Alberta: South Edmonton, 1; Moose Mountain, 2 (skins only). 



THOMOMYS FUSCUS MYOPS Merriam 

 Little-Headed Pocket Gopher. 



(PL Vm, fig. 15.) 



Thomomys myops Merriam, Proc. Biol. Soc. Washington, XIV, 112, July 19, 1901. 



Type. — Collected at Conconully, Okanogan County, Washington, by 

 J. Alden Loring, September 11, 1897. Type specimen in U. S. Nat. 

 Mus., Biological Survey collection. 



Distribution. — Known only from type locality (fig. 5) . 



Characters. — Size smaller than fuscus but with very similar colora- 

 tion and the same minute ears; skull small; tips of premaxillas even 

 with posterior tips of nasals. 



Color. — September pelage: Upperparts light brownish or dull walnut- 

 brown; ear patch blackish; nose plumbeous; underparts and base of 

 tail, buff y; feet and tip of tail whitish; chin usually white. Young, 

 paler, more grayish. 



Slcull. — Small, but of about the form and proportions of that of 

 fuscus; nasals and premaxillse terminating posteriorly on an approxi- 

 mately even line; interparietal transversely elongated; bullae small; 

 anterior shaft of basioccipital relatively wide; pterygoids wide apart, 

 with edges flattened at base. 



Measurements. — ^Average of 2 topotypes ( c? ad.) : Total length, 

 182; tail vertebrae, 57; hind foot, 25. Average of 5 females: 186, 59, 

 24.4. STcull (of type, 9 ad.): Basal length, 31.8; nasals, 12.5; zygo- 

 matic breadth, 20; mastoid breadth, 17.5; alveolar length of upper 

 molar series, 7.5. 



Eemar'ks. — Specimens from the type locality, Conconully, on Con- 

 conully Creek, a western afiluent of the Okanogan River, are very uni- 

 form in characters and so peculiar that they were originally described 

 with full specific rank. They evidently belong to Wiq fuscus group. 



