132 PROCEEDINGS OP THE AMERICAN ACADEMY 



ending in a sharp spine. Third maxillipeds hairy within and below. 

 Chelipeds stout; chela large, external margin convex; hand ciliato- 

 punctate above and below (the dots large), swollen above, internal 

 border of moderate length and furnished with two or three rows of 

 depressed ciliate tubercles ; fingers gaping at base, at least in large 

 individuals, costate and punctate-lined, external margin of movable 

 finger with depressed ciliated tubercles irregularly disposed in two 

 rows; tips of fingers incurved, horny. Carpus smooth or faintly tu- 

 berculate above, a large, acute median internal spine, and small proxi- 

 mal and distal internal spines ; beneath, the carpus has a very minute 

 or no median anterior spine, a short and acute external spine. Meros 

 with two superior, obliquely placed ante-apical spines ; of the ordinary 

 biserial inferior spines only the distal one or two of the outer row are 

 developed. Third pair of legs hooked on third segment. Thora- 

 cic sterna hairy. First pair of abdominal appendages very long, 

 reaching the base of the chelipeds when the abdomen is flexed, tuber- 

 culated on internal border at the base, deeply bifid, rami slender, 

 acute, forming an acute angle with the basal part, the outer slightly 

 recurved, the inner shorter, incurved, and a little dilated before the 

 tip ; a projecting angle or shoulder on the anterior border at base 

 of rami. 



Male, form II. Chela smaller, fingers not gaping, hook on third 

 segment of third pair of legs smaller ; first pair of abdominal appen- 

 dages split only half as far down as in the first form, rami much 

 thicker, no projecting angle on the anterior border; these appendages 

 are as long as in the first form, reaching forward to the base of the 

 chelipeds ; they are articulated near the base. 



Female. Chela shorter and wider, external finger bearded within 

 at base ; sternum between fourth pair of legs non-tuberculate, lightly 

 ciliate. Annulus ventralis large, transverse fossa broad and deep, an- 

 terior border bituberculate. 



Measurements of a male, form I. : — Length of body, 73 mm. Length 

 of carapace, 36 mm. From tip of rostrum to cervical groove, 24 mm. 

 From cervical groove to hind border of carapace, 12 mm. Length 

 of rostrum, 11 mm. Breadth of rostrum at base, 4.5 mm. Length 

 of acumen of rostrum, 4 mm. Width of areola, 2.5 mm. Length of 

 abdomen, 37 mm. Length of chela, 34 mm. Breadth of chela, 

 14 mm. Length of movable finger, 22 mm. 



Known localities. Kentucky : Grayson Springs, Grayson Co. ; 

 Green River, near Mammoth Cave ; Cumberland Gap. 



M. C. Z., Cat. No. 3574 (young female), from Knoxville, Tenn., 



