CAMBABU8. I I'.t 



inner shorter, incurved, mid :i little diluted before (In- tip ; a projecting angle 

 or shoulder on the anterior bonier at base of rami. 



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

 of third pair of legs smaller; lirst pair of abdominal appendages 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 lirsl lorrn, 

 re, idling forward to the base of the chehpeds; they are arlicnla.led near 

 the base. 



Female. Chela shorter and wider, external linger bearded within at 

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

 Annulus ventralis large, transverse fossa, broad and deep, anterior border 

 bituberculate. 



Measurements of a male, form I. Length of body, 7-'> mm. Length of 

 carapace, :!i; mm. From lip of rostrum to cervical groove, "1 1 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 mrn. Length of 

 chela, 34 mm. Breadth of chela, 14 mrn. Length of movable finger, 22 mm. 



Known Local'ilics. Kentucky: Grayson Springs, Grayson Co.; Green 

 River, near Mammoth Cave ; Cumberland Gap. 



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

 Faxon, and No. 3575 (male, form II.), from Bradford, Ind., A. S. Packard, 

 Jr., probably belong to this species, but the specimens are too young to 

 determine with confidence. 



This species resembles C. spinosus, from which it is easily distinguished 

 by the length of the posterior section of the carapace, and by the length of 

 the male appendages. From C. affmh it may be separated by the different 

 form of the male appendages and female annul us ventralis, and by the single 

 lateral spine of the carapace. I have seen males of the first form only 

 34 mm. in length. 



50. Cambarus forceps. 



Plate V. IB. . riaic- i\. lit"*. r>, r,', fia, Sat. 

 Camtanu forcep PAXOH, Proc. Amer. Ac : nd Sci., XX L33 



Male, form I. Rostrum narrow, excavated, faintly carinated in the mid- 

 dle; margins divergent at the base, thickened, dotted-lined ; acumen long 



