28 A REVISION OF THE ASTACID.E. 



Both Girard and Gibbes (Proc. Amer. Assoc. Adv. Sci., 3d Meeting) 

 appear to have confounded this species with C. Blauditigii Harlan. A female 

 G. troglodgtes in the Museum of Comparative Zoology, from South Carolina, 

 is labelled "Astacus Blandingi Harl." by Professor Gibbes. The localities for 

 C. Blandingii (Summerville, S. C, and low country of South Carolina) given 

 by these authors undoubtedly appertain to C troglodytes. 



Slight differences between specimens from Georgia and Charleston, S. C, 

 are pointed out by Hagen (pp. 42, 43). In one of the Georgia specimens the 

 telson is quadrispinose. In specimens from near Columbia, S. C, the basal 

 segment of the telson is bispinose on each side. 



The rostrum is sometimes slightly carinated near the tip. 



I doubt the accuracy of the locality label of the specimen of this species 

 in the Museum of Comparative Zoology numbered 197. It was taken from 

 a jar containing C. Diogenes from Lawn Ridge, 111. No other specimens have 

 been reported from the West. 



The specimen in the Museum of Comparative Zoology (No. 3337) labelled 

 Rocky River, Olmsted, Ohio, determined as C. troglodytes by Hagen (p. 43 ), 

 seems to be C. Clarldl (see p. 27). 



According to colored drawings of this species made from living specimens 

 by J. Burkhardt at Charleston, in 1853, the body is brownish red, the tuber- 

 cles on the cheke bright red, legs red below. 



Dr. Le Conte states that in Lower Georgia this species is found in the rice- 

 fields, where it makes holes four inches deep, and in ditches (A.fossaruut). 



Specimens from Richmond Co., neighborhood of Augusta, Ga., received 

 recently from Col. Charles C. Jones, Jr. (Cat. No. 3550), are noteworthy in 

 that the male appendages, especially of the second form, approach closely 

 in their form those of C. Clarkii. In the shape of the rostrum and other 

 respects these specimens agree with C. troglodytes. The telson is trispinose 

 on each side. In the light of these specimens, I am inclined to suspect 

 that further explorations will break down the specific distinctions between 

 C. troglodytes and 0. Clarkii But my material does not represent a wide 

 enough geographical range to warrant a definite opinion. 



