PODOPTHALMATA— ASTACIDJE. 73 



Packard (1888, 40) from Nickajack Cave, Tennessee, has the same 

 general characters as the other cave species mentioned, though this one 

 is less slender in body than C. pelliicidus. 



Camharus acherontis Lonnberg (Faxon, 1898, 645) is a subterranean 

 species found in caves and underground streams in Florida. 



Cambarus bartonl (Fabriclus). 



(?) Aafacns bartonii, Fabricius, Suppl. Entom. Systemat., 1798, 404. 



Cambarus bartoni, Hagen, 111. Cat. Mus. Comp. Zool., Ill, 1870, 75 (Mammoth Cave). 

 Putnam, Proc. Bost. Soc. Nat. Hist., xvil, 1874, 222 (Mammoth Cave). Smith, 

 Am. Journ. Sci. and Arts, ix, 1875, 497 (Mammoth Cave). Hubbard, Amer. 

 Ent., Ill, 1880, 38 (Mammoth Cave). Faxon, Mem. Mus. Comp. Zool., x. No. 4, 

 1885, 41, 59 (Mammoth Cave). Packard, Pop. Sci. Mon., xxxvi, 1890, 393 (Mam- 

 moth Cave). Hay, Rep. Ind. Geol. Survey, xx, 1895, 487 (May's [?] Cave, 

 Down's Cave, Connelley's Cave, a cave near Paoli, and other localities) ; the same, 

 XXI, 1896, 210 (Strong's, Clifty, Donnehue's, and Spring caves). Faxon, Proc. 

 U. S. Nat. Mus., XX, 1898 (caves in Lawrence and Orange Counties). Harris, 

 Kan. Univ. Sci. Bull., ii. No. 3, 1903, 72 (cave localities as above). 



This species is common throughout the central and eastern United 

 States and is one of the most common of crayfishes in this part of Indiana. 

 It is most abundant in running water, especially in the smaller streams, 

 in the neighborhood of springs, and about shallow, rocky pools. It finds 

 its way to the very headwaters of the smallest streams, where it is 

 found in short burrows under rocks or under the bank. 



Its distribution in caves seems to be quite general. I have found it 

 common in the Twin and Donaldson's Spring caves at Mitchell, Indiana, 

 where it is most abundant in twilight near the entrances, although 

 often found well within the caves. It is extremely abundant between 

 the Twin Caves, where a stream comes out of one cave, flows as an open 

 stream for about 50 yards, and then becomes a subterranean stream 

 within the other cave. The stream is fairly swift and cold, and its bed 

 is strewn with pieces of limestone, so that the locality is quite favorable 

 for this species. On several occasions as many as 200 large individuals 

 were collected at this place for class use at Indiana University. These 

 included the largest and finest individuals of C. bartoni I have ever 

 seen, some of them measuring over 100 mm. in length. C bartoni 

 tenebrosus Hay (1902a, 232) from Mammoth Cave becomes larger. I 

 have a specimen of it 138 mm, long. This variety is also found in Horse 

 Cave and a cave near Glasgow, Kentucky. C. bartoni is reported from 

 a vast majority of the Indiana and Kentucky caves, where C. pellucidus 

 occurs, and is reported from Virginia and West Virginia caves, where 

 C. pellucidus is not found. 



