CRAYFISHES. 383 
to cervical groove, 22mm.; length of chela, 35 mm.; breadth of chela, 15 mm.; 
length of dactylus, 21.5 mm. 
Huntsville, Madison Co., Alabama. One male, form I. M.C. Z., No. 301. 
This specimen was considered to be C. immunis by Hagen, is mentioned 
by him on page 72 of his Monograph, and its chela is probably the one figured 
by him on Pl. VIII, fig. b. Compare my ‘‘ Revision of the Astacidae,’’ p. 100. 
Six specimens in the U. 8. National Museum, three of which are males of the 
second form, and three females (No. 23,092) collected by Mr. J. E. Benedict at 
Nashville, Tennessee, in May, 1897, without much doubt are conspecific with 
the type specimen of C. validus. As they are younger than the type specimen, 
and as the first form of the male is not represented among them, the peculiarities 
of the species are not so well pronounced. The chelae are proportionally smaller 
and the curve of the immobile finger is less. This finger, as in the type specimen 
and in C. immunis, is heavily bearded within at the base. The gonopods of the 
males are similar to those of second-form males of C. immunis, but less strongly 
curved; indeed the curve of the stem of the organ is no greater than it is in C. 
virilis, but the blunt recurved tips are subequal as in C. immunis; in other words 
the shape of the second form male organ is the same as in C. alabamensis. The 
annulus ventralis of the female is virtually the same as in C. immunis. 
CAMBARUS MISSISSIPPIENSIS Faxon. 
New locality:— Agricultural College, Oktibbeha Co., Mississippi (U. S. 
N. M.). 
CAMBARUS LANCIFER Hagen. 
A female specimen, collected by Robert Kennicott at Cairo, IIL, is in the 
U.S. National Museum. The few specimens heretofore known have come from 
Root Pond, Miss., Vicksburg, Miss., and the St. Francis River at Greenway and 
Big Bay, Clay Co., Ark. 
CAMBARUS BARTONII (Fabricius). 
New localities:— Matne: Little Madawoska River, a tributary of Aroostook 
River at New Sweden, Aroostook Co. (M. C. Z.); brook tributary to 
Aroostook River at Caribou, Aroostook Co. (Coll. W. P. Hay). New York: 
Schoharie Creek, Catskill Mts., Green Co. alt. 2,000 ft. (U.S. N. M.); Little 
