148 



Indiana Academy to this interesting and much neglected part of our fauna 

 that this paper is written. 



Camharuii argillicola Faxon. Very common in central Indiana. It is 

 very similar, both in appearance and habits, to its near relative, C. diogencs. 

 Like this latter species, C argillicola burrows and raises mud chimneys at the 

 mouth of its hole. It is apparently of smaller size than C. diogenex, the largest 

 specimen measuring barely 2^ inches from the rostral spine to the end of the 

 tail. The bearded hand spoken of by Dr. Faxon in his monograph is 

 hardly a constant feature. Indeed, of all the specimens which have come 

 under my notice at least half, without distinction as regards sex, were with- 

 out the beard. The eggs are laid in the early spring, often, it seems, before 

 the females retire to their burrows. A small female bearing eggs was taken 

 from a pond April 2, and a female with young was dug from a burrow 

 April 20. The burrows were excavated in the tough clay, near a pond, to 

 a depth of about 2^ feet. 



Cambarus bartonii Fabricius. This species will probably be found to 

 occur throughout the state. It is much more common, however, in rocky 

 localities than elsewhere. It is a cave-loving species, occurring in nearly 

 every one of the caverns of southern Indiana. I have often observed 

 both it and C. pelluddus in the same cave. 



Cambarus hlandhigii Hagen. A number of specimens from English Lake 

 seem to be this species, though they may be the following, which is re- 

 ported by Dr. Faxon. 



Cambarus Uandingii var. acuta Faxon. This species is reported from 

 Wheatland, Knox county. 



Cambarus diogenes Girard. In early spring this is the most conspicuous 

 crayfish, both by its abundance, large size, and fine coloraticm. The females 

 far surpass any other species in the different colors, which are beautifully 

 blended. As they are strictly a burrowing species, they are to be found only 

 during the breeding season, which begins about the first of April. At this 

 time they are very common, even in the daytime. At night they are abund- 

 ant. Thirty-five large specimens were collected in one evening, April 2, 1892. 

 Of this number twenty-nine were males and six females. A number of fe- 

 males found in copulation were separated from the rest to observe the time 

 elapsing before the eggs were laid. The first eggs were laid April 18, while 

 another specimen of the same lot, with well developed but unlaid eggs, 

 was killed and dissected April 20. 



After the breeding season they retire to their burrows, and for the rest of 



