394 Annals of the Carnegie Museum. 



lei," as Faxon states. The lateral corners of the margins, where they 

 pass into the short, triangular acumen, are generally quite sharp. 



The type-locality of this species is Tiger Hall Farm, Greenville, 

 Green county, South Carolina (C caroUmis Er., see Faxon, 1885, 

 pp. 9 and 56). The type of Faxon's C. ditbius is from Cranberry 

 Summit (called now Terra Alta), Preston county. West Virginia, on 

 the divide between the upper Youghiogheny and Cheat Rivers. Ad- 

 ditional localities, recorded previously, are : Pennington Gap, Lee 

 county, Virginia ; Cumberland Gap, Claiborne county, Tennessee 

 (Faxon, 1885); "among the Cherokees, " Indian Territory (Faxon, 

 Proc. U. S. Mus., 12, 1890, p. 624), and Hay says that it is found in 

 southwestern West Virginia. I have collected this species, outside of 

 the state of Pennsylvania, at Selbysport, Garrett county, Maryland 

 (Youghiogheny valley). In Pennsylvania, it has never been found 

 before, but is quite abundant in the mountain region between Chest- 

 nut Ridge and the main chain of the Allegheny Mountains, in Somerset, 

 Fayette, and the southern extremity of Westmoreland county. Special 

 localities are the following : Somerset county : Rockwood, at about 

 1,900 feet elevation ; Meyersdale, about 2,000 feet ; Listie, 1,900— 

 2,000 feet ; Fayette county : Dunbar, abundant on Chestnut Ridge 

 at 1,260 feet elevation; stragglers associated with C. diogenes at 

 1,070 feet elevation ; Indian Creek, 1,900 feet ; Ohiopyle, in Rainier 

 Park, 1,250 feet. In Westmoreland county, I found this species 

 only in the southern extremity, in the region of the headwaters of 

 Indian Creek at Jones Mills, about 2,000 feet elevation. 



Thus it appears that this is a true mountain species, being found 

 generally at an altitude from 1,200 to 2,000 feet above sea level (in 

 Pennsylvania). The Chestnut Ridge forms its boundary toward the 

 northwest, the Allegheny Mountains toward the southeast. It belongs 

 chiefly to the drainage of the upper Youghiogheny and Casselman 

 Rivers, but at Listie, Somerset county, it has crossed the transversal 

 divide in the longitudinal valley between the Laurel Hill and Allegheny 

 Mountains, and is found in the headwater region of Stony Creek that 

 runs to the Conemaugh. How far it extends north here is unknown, 

 but it is surely not present in the neighborhood of Cresson, Cambria 

 county. 



The new locality at Selbysport, Maryland, connects the Pennsyl- 

 vania range with the type-locality of C. dubhts in Preston county. 

 West Virginia. 



