1915 ] 



SCAPANUS LATIMA^y^US LATIMANUS. 



65 



region ; rostrum short and relatively heavy ; unicuspid teeth irregular 

 and crowded. 



Color. — Fresh winter pelage: Above, fuscous-black, chsetura drab, 

 or chsetura black; old and faded specimens more brownish, fuscous 

 to mummy brown; beneath, much as above but paler, usually 

 sHghtly more grayish, and frequently stained with brown mid- 

 ventrally. Summer pel-age: Usually paler and shghtly more brown- 

 ish than winter pelage, drab, hair-brown, or chaetura drab, paler 

 beneath. Young: Usually darker and more grayish than adults. 



SlcuU. — Size medium, flat; sublachrymal-maxillary ridge heavy 

 and well defined; rostrum short and broad; unicuspid teeth irregular 

 in size, and crowded; second lower incisor caninehke, larger, and 

 longer than either the first or the third incisor. The skull of S. I. 

 latirmnus is very much smaller than that of S. townsendii, the skulls 

 of large adult males of latimanus being smaller than the skulls of 

 small adult females of townsendii; the rostrum of latimanus is rela- 

 tively shorter and broader than that of townsendii, and the unicuspid 

 teeth are more irregular in size and shape, and more crowded. 

 Compared with S. o. orarius the skull of latiraanus is wider and much 

 heavier, with less rounded and more truncate braincase, much shorter 

 and broader rostrum, much heavier sublachrymal-maxillary ridges, 

 larger teeth, and heavier horizontal rami of mandibles. The skull 

 of typical latimanus is larger than that of any other subspecies of 

 S. latimanus except S. I. alpinus, from which it is indistinguishable. 



Measurements. — ^Adult male from Gilroy, Santa Clara County, 

 Cal.: Total length, 173; tail vertebrae, 35; hind foot, 23. Average of 

 4 young adult males from Santa Cruz, Cal. : 175.8 (173-181); 33.3 

 (32-38) ; 20.8 (20-21). Average of 4 young adult females from Santa 

 Cruz, Cal.: 171.5 (162-185); 32.5 (31-35); 20.8 (20-21). Sl:uU: 

 Adult male from Gilroy, Santa Clara County, Cal. : Greatest length, 

 36.2; palatilar length, 14.4; mastoidal breadth, 17.3; interorbital 

 breadth, 7.8; maxillary tooth row, 11.2; mandibular molar-premolar 

 row, 10.9. Average of 4 skulls of young adult males from Santa 

 Cruz, Cal.: Greatest length, 36.1 (35.7-36.6); palatilar length, 14.2 

 (13.8-14.6); mastoidal breadth, 17 (16.9-17.3) ; interorbital breadth, 

 7.8 (7.5-8); maxillary tooth row, 11 (10.8-11.1); mandibular 

 molar-premolar row, 10.6 (10.5-10.8). Average of 7 skuUs of 

 adult males from Nicasio, Cal.: Greatest length, 37.1 (36.6-37.4); 

 palatilar length, 14.5 (14.3-14.7); mastoidal breadth, 17.3 (17-17.^); 

 interorbital breadth, 7.8 (7.5-7.9); maxillary tooth row, 11.3 

 (11.1-11.6); mandibular molar-premolar row, 11 (10.7-11.4). Aver- 

 age of 4 skuUs of young adult females from Santa Cruz, Cal. : Greatest 

 length, 34.7 (34.4-35); palatilar length, 13.8 (13.4-14.1); mastoidal 

 breadth, 16.8 (16.6-17); interorbital breadth, 7.8 (7.7-8); maxiUary 



