CRAYFISHES. 387 



were pointed out in my Revision, p. 64. It may be well in our present more 

 advanced knowledge of the C. bartonii group to recognize C. montanus as a 

 geographical race or subspecies of C. bartonii. 



In the collection of the Academy of Natural Sciences of Philadelphia there 

 is a young male, labelled "James River, Va., C. montanus?" which is very prob- 

 ably a cotype or paratype of Girard's Cambarus montanus. With regard to this 

 and other quasi types of Girard's species in the Philadelphia Academy, the reader 

 is referred to Hagen's Monograph, p. 7, and my Revision, p. 11. 



I have examined specimens of C. bartonii montanus, nearly or quite typical, 

 from the following locaUties: — Virginia: Wytheville, Wythe Co. (U. S. N. M., No. 

 13,966, M. C. Z., No. 3,838); Rocky Gap, Bland Co. (U. S. N. M., No. 28,568.) 

 West Virginia: Horsepen Creek, [Mingo Co.?] (U. S. N. M. No. 28,555) ; Madam 

 Creek, tributary of New River, opposite Hinton, Summers Co. (U. S.- N. M., 

 No. 28,556, M. C. Z., No. 7,398) ; Bergen's Springs, 12 miles above Hinton (U. S. 

 N. M., No. 28,566); Delashmeet Creek, Kegley, Mercer Co. (U. S. N. M., No. 

 28,610); Bluestone River, just above its mouth, Mercer Co. (U. S. N. M., No. 

 28,570); mouth of Delashmeet Creek, Bluestone River, Mercer Co. (U. S. N. M., 

 No. 28,565) ; Bluestone River, Abb's Valley (U. S. N. M., No. 28,569) ; East 

 River, Mercer Co. (U. S. N. M.); Rich Creek, Spanishburg, Mercer Co. (U. S. 

 N. M.); Barrenche Creek, Perrysville, McDowell Co. (U. S. N. M., No. 28,573); 

 War Creek, McDowell Co. (U. S. N. M., Nos. 28,564, 28,580); Guyandotte 

 River, Baileysville, Wyoming Co. (U. S. N. M., Nos. 28,562, 28,578, 28 rf"). 



Isolated localities from which I have seen specimens of C. bartonii very 

 closely resembling the form montanus in the breadth and punctation of the areola 

 are: Alum Creek, FrankUn Co., Ohio, R. C. Osburn and E. B. Williamson (U. S. 

 N. M., No. 22,351), Cincinnati, Ohio (M. C. Z., No. 288), creek at Knox\'ille, 

 Tenn., Walter Faxon (M. C. Z., No. 3,477). From Cogar's Mill, Elk River, 

 Kanawha Co., W. Va., I have seen an interesting lot of specimens that combine 

 the characters of C. b. montanus and C. b. longulus, the rostrum and chela of 

 montanus going with the reduced sub-orbital angle of longulus. These specimens 

 are in the.U. S. National Museum, No. 23,990, and in the Museum of Compara- 

 tive Zoology, No. 7,401. 



Cambarus bartonii robustus (Girard). 

 Plate 3. 



From Cambarus bartonii montanus the passage is easy to C. b. robustus, in 

 which form the rostrum is longer and more tapering, the areola rather longer 

 and narrower and the outer margin of the hand more costate, an emphatic de- 



V 



