438 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxv. 



Alabama, and Ashland, Cheatham Count}-, Tennessee, in which the 

 areola is reduced almost to a line in the middle, the metacarapace is 

 longer in proportion to the procarapace, the ting-ers are shorter, the 

 tuberculation of the hand weaker, the epistoma narrower and less 

 strongly truncate. 



Recent additions to the collection of the United States National 

 Museum and the Museum of Comparative Zoology, of material col- 

 lected near Nashville, Tennessee, by Mr. E. B. Williamson and a 

 series of specimens collected by myself at Nickajack Cave show that 

 we are dealing with a distinct geographical race of C latimanus^ the 

 range of which extends over the eastern portion of Tennessee and 

 northern portion of Georgia and Alal)ama. 



It may be described as follows: Similar to C. lafrmcmns, but with 

 the rostrum a little more decurved and perliaps a little broader toward 

 the tip. Sul)orbital angle rounded, l)ranchiostegian spine developed, 

 but very small, lateral spine of carapace usually" represented by a 

 denticle just behind the cervical groove. Areola linear, sometimes 

 almost obliterated, its length equal to the distance from the cervical 

 groove to the base of the rostrum. Epistoma triangular, not trun- 

 cate, sides convex. Hands with one rather strong row of squainose 

 tubercles along the inner margin and just above it another ol)scure 

 row of much weaker tubercles, hand and, especially the lingers, 

 deeply and roughlj- punctate, but not tuberculate, except as just men- 

 tioned. The carpus commonly bears strong median and small proxi- 

 mal internal spines and a rather blunt spine below at the distal border, 

 but both this segment and the meros vary, as they do in the typical 

 forms. 



The specimens from Ashland City, mentioned a])ove, belong to this 

 subspecies, and the others are, in various ways, intermediate l)etween 

 the typical C latiinanus and those just described. 



From a series sent alive to the United States National Museum 

 the following color notes were taken, which are interesting in that 

 they show that the same species may have at least two styles of 

 coloration. The sexes were not distinctively colored and there was 

 some variation in each style. 



In one, the ground color, in fact nearly the entire liody was a clear 

 sage green shading into dirty gi'a}^ brown on the sides and tail tin and 

 into very dark-])rown black on the sides of the head. There were Ji 

 few blackish shadings on the angles and inner surfaces of the meros, 

 carpus, and chelipeds. The margins of the rostrum, postorbital 

 ridges and the tips of all the spines on the chelipeds and the tips of the 

 lingers were ochre yellow. Beneath, the color was of a uniform light 

 gray. 



In the other style of coloration the ground color was a dark brown 

 (near clove brown but not so red), becoming a little lighter on the head 



