TEN INDIANA CAVES. 171 



moccasin tracks were seen and noted by many of the 

 early explorers, and low stone walls were put around 

 them for protection, but the tracks have since been 

 almost entirely obliterated by persons who, unmindful 

 of the warnings of the guides, stepped over and upon 

 them. 



Crawfish Spring is formed from a small stream 

 which flows through a cleft in the rock, and from it a 

 trickling rill meanders on beneath the edges of the 

 jutting walls to be soon lost to view beneath the roof 

 which a few rods farther on comes down to meet the 

 floor. Above the spring is the passage known as 

 Wabash Avenue, which extends for several hundred 

 yards in a north-westerly direction where it forks into 

 a number of low and muddy branches. 



Within the waters of the rill were several specimens 

 of the blind crawfish and numerous examples of two 

 other smaller crustaceans, already mentioned. About 

 the margins of the spring and stream and on the mud 

 flats lying beyond, were secured a number of the true 

 cave beetles, Anophthalmus tennis Horn. Single speci- 

 mens of this insect had previously 

 A Blind ~ \ 



been taken in several of the caves 



Cave Beetle. 



visited, and in Wyandotte it had been 

 found about the Throne and on top of Monument 

 Mountain. It is found only in remote parts of 

 the caves in which it occurs, and is always crawl- 

 ing rapidly over mud, sand or rocks in damp locali- 

 ties. It is a small, light-brown species, with no ves- 

 tige of eyes, and appears wholly unaffected by the 

 light of a candle when the latter is held within a few 

 inches of it. 



