PROCEEDINGS OF THE NATIONAL MUSEUM. 623 



Cambarus longulus Gir. 



Cambarus longulus Girard, Proc. Acad. Nat. Sci. Phila., vi, 1852, p. 90. 

 Cambarus bartonii (part.) ? Hagen, Mon. N. A. Astacidae, pp. 78, 79, 1870. Faxon, 



Proc. Amer. Acad. Arts and Sci., xx, 1884, p. 143. Id., Rev. Astacidte, pt. i, 



p. 66, 1885. 



Waynesborough, Virginia ; Lick Ran, James Kiver, Virginia; North 

 River, Lexington, Virginia; Wytheville, Virginia; South Fork of Hol- 

 ston River, near Marion, Virginia; Spring Creek, Hot Springs, North 

 Carolina; Watauga River, Elizabethton, Tennessee. Col. M. McDon- 

 ald and Prof. D. S. Jordan (U. S. F. 0.). Specimens in the Museum 

 of Comparative Zoology from Bath County, Virginia, from near White 

 Sulphur Springs, West Virginia, and from Knoxville, Tennessee, prob- 

 ably belong to this species, but they are too young to determine with 

 certainty. 



It is only after examining the large number of specimens (over one 

 hundred, including females and both forms of the male), collected by 

 Colonel McDonald and Professor Jordan, that I am prepared to restore 

 this form to the full rank of a species. When the Monograph of the 

 North American Astacidre was written, Dr. Hagen had seen but one 

 specimen (Girard's type), and he inclined to regard it as a deformed 

 individual of C. bartonii. His description of the type specimen shows 

 that it is the same as the form now under consideration. Compared 

 with the typical G. bartonii from eastern Pennsylvania, the rostrum of 

 G. longulus is much longer and narrower, deeply excavated above, the 

 sides thickened, somewhat concave and convergent, with longer acu- 

 men; the antennse scale is produced into a longer spine; the carapace 

 is more finely punctated, the hepatic and branchial areas smoother, 

 the suborbital angle commonly but little or not at all developed ; the 

 chelse are smoother and broader; the fingers more cylindrical, without 

 the longitudinal rid ge along the upper face of the outer finger, "widely 

 separated at the base, the outer one bearded within at the base and 

 along the margin ; the basal spine of the inner margin of the carpus is 

 absent. The beard on the hand is densest in small specimens, being 

 more or less removed by attrition in old individuals. In specimens 

 from Marion, Virginia, Spring Creek, North Carolina, and Elizabethton, 

 Tennessee, the suborbital angle is prominent, as in C. bartonii. In G. 

 bartonii longirostris Fax. (Rev. Astacida?, p. 64), the rostrum is not so 

 much contracted, its margins not so much thickened as in G. longulus, 

 iu fact the rostrum of spinirostris has about the same shape as that of 

 G. bartonii robustus; the sides of the antennal scale are straight and 

 nearly parallel to one another; the fingers are not separated more than 

 in the typical G. bartonii and not so densely bearded as in C. longulus. 

 It connects with the typical bartonii through robustus. But I have 

 hardly enough material before me to give spinirostris a firm place as a 

 subspecies. 



