1915.] 



SCAPANUS LATIMANUS DILATUS. 



78 



Ty^e locality. — ^Fort Klamath, Klamath County, Oregon. 



Type specimen. — No. 186628, U. S. Nat. Mus., Merriam collection; 

 adult, sex unknown, skeleton; collected m 1883 by Charles E. Bendu-e. 



Geographic range. — South-central Oregon and Upper Sonoran aAd * 

 Transition Zones of northeastern Cahfomia and adjacent parts of 

 Nevada. 



General cJiaracters. — Similar to ^S'. Z. latimanus, but much paler and 

 averaging shghtly smaller; skull shorter, higher, and more rotund 

 than in latimanus. 



Color. — Summer pelage: Upperparts mouse gray, hght drab, or 

 drab, in some specimens becoming more brownish on the nose; 

 underparts neutral gray, mouse gray, or smoke gray, sometimes 

 tinged with Hght drab and occasionally stained in midventral line 

 with Dresden brown. 



Slcull. — Smaller than that of S. I. latimanus or S. I. alpinus, rela- 

 tively shorter, higher through the braincase, and relatively wider 

 through the mastoids. About equal in length to the skull of S. I. 

 sericatus, but relatively much wider and higher through the brain- 

 case. 



Measurements. — Two adult males from McCloud, Cal.: Total 

 length, 178, 170; tail- vertebrae, 36, 42; hind foot, 21, 21. SMll: 

 Type (sex unknown): Greatest length, 34.3; palatilar length, 13.6; 

 mastoidal breadth, 16.8; interorbital breadth, 7.8; maxillary tooth 

 row, 10.4;^ mandibular molar premolar row, 10.3. Skulls of two 

 adult males from McCloud, Cal.: Greatest length, 34.7, 35.2; palatilar 

 length, 13.2, 13.7; m astoidal breadth, 17.3, 17.3; interorbital breadth, 

 7.8, 7.9; maxillary tooth row, 9.8, 10.3; mandibular molar premolar 

 row, 9.5, 9.5. 



RemarJcs. — True based his description of this form entirely upon 

 the cranial characters of a specimen with abnormal dentition, there 

 being in the type only three maxillary premolars. Later he placed 

 the name in synon^nny^ under Scapanus calif amicus ( = 8. I. lati- 

 manus). The skuU of the type, however, is relatively shorter and 

 broader than that of typical latimanus. Unfortunately the exact 

 color of the mole found at Fort Klamath, Oreg., is not known, there 

 being no skins available from that locahty; two alcohohcs from the 

 type locahty, however, seem to indicate that the animal is pale, 

 Hke the mole of northeastern Cahfornia; from a geographic view 

 point this is what one would anticipate; specimens from Ashland 

 and Fremont, Oreg., are pale, hke specimens from northeastern 

 California, and those from Ashland have skulls inseparable from 

 the skuU of the type of dilatus. The type of Scapanus truei Mer- 

 riam, which is now placed in synonymy under dilatus, is a rather 



' Upper tooth formula abnormal: i. 3, c. 1, pm. 3, m, 3. 

 2 True, F. W., Proc. U. S. Nat. Mus., vol. 19, p. 52, 189G. 



