NO. 1292. CB USTA CEAXS OF XICKAJA CK CA VE—HA Y. 435 



Order MACROURA. 



Family ASTACID.E. 



Genus CAMBARUS. 



CAMBARUS BARTONI CAVATUS, new subspecies. 



7///>d.— U.S.N. M. 25017. Powell K. l\izcwcll, Tennessee. 



Dl.strihutlon. — Eastern and central Tennessee. 



Similar to C. hartoni^ but with ])road, parallel sided, deeply exca- 

 vated rostrum; the appearance of deep excavation being- partial!}- given 

 by the unusually high elevation of the margins of the rostrum. The 

 areola is narrowan- and more thickly punctate than in C Tmrtoni Ixirfoni 

 and the epistoma is triangular. The antennre extend almost to the end 

 of the abdomen and the carapace is more nearly cylindrical. 



While, as in all the other subspecies of C. harUmi, ther(> is quite a 

 little variation noticeable in this form, the characters given a))ovc will 

 ])e found to hold good in the majorit}" of cases. Intermediates with 

 the Kentucky or Virginia forms must of course l)e expected. 



There are in the United States National Museum specimens of this 

 su])species from the following localities in Tennessee: Tennessee River 

 near Knoxville and Chattanooga; Balls Creek near Tazewell; Indian 

 Creek near Cumberland Gap, and Powell River at Tazewell. The 

 latter, w^hich have ])een selected as the types, have the characters of 

 dili'erence most marked. 



I found this crayfish in small numl)ers in the cold water flowing 

 from the John Ross Spring at Rossville, Georgia. One large female 

 carried young. 



CAMBARUS HAMULATUS Packard. 



The crustacean of the greatest interest to me in Nickajack Cave was 

 the l)lind crayfish, Camharus Jiainulatus^ described by Packard.^ The 

 first specimens were observed during my first visit to the cave; a male 

 and a female about 45 mm. in length were found on a mud bank at the 

 edge of the water. No more could l)e collected during the first week, 

 although repeated search was made in all possi])le localities. 



At the time of my second visit to the cave, after the water had fallen 

 and was clear again, a specimen was occasionally observed. But it 

 was not until 1 began to look for them under the rocks in the cave 

 stream that I found how common the}" were. They appeared habitu- 

 ally to live under such, where they had scooped out a cavity in which 

 to lie and from which they seemed seldom to travel. When disturbed, 

 if they sought to escape, it was by crawling away rather than by swim- 

 ming, and they would seldom move more than a few feet. Most often, 

 however, they would lie perfectly still, and after the cloud of nuid 



Orconeclen liamulaius Packard, i\juer. Nat., XV, 1881, p. 880. 



