HARRIS: CRAYFISHES OF KANSAS. 267 



4. Cambarus diogenes Girard. 



C. diogenes, Girard, '54, with notes on burrowing habits. 



C. obesiis, Hagen, '70, with fig. of male, F. I, abd. app. of male, 

 F. I and II, lamina, epistonia, and "spina externa." 



C. diogenes var. ludoincianus , Faxon, '84. 



C. diogenes, Hay, '96, with sketches of carapace, lamina, annulus 

 ventralis and abd. app. of male, F. I. and II. 



Notes on variation, habits, etc., Faxon, '85. 



Burrows of C. diogenes, Tarr, '84. 



Burrows of C. diogefi^s, Abbott, '84. 



1. Leavenworth, Leavenworth county (coll. Mus. Comp. ZooL), 

 (Faxon, '85 b). 



2. Lawrence, Douglas county (coll. U. of K.), L. A. Adams, 

 coll. 



C. diogenes has been reported from only the two adjoining counties, 

 Douglas and Leavenworth. Probably the reasons for the meager 

 ness of the reports of the occurrence of this species and C. gracilis 

 are the same, both being burrowing species. I am inclined to 

 think, however, that C. diogenes is not abundant in Douglas county. 



Hay, '96 reports this species as laying their eggs from April 18 

 to 30. According to him the early spring when they come forth 

 to breed and lay their eggs is the only time they are a noticeable 

 member of the fresh water fauna. Hay's ol)servations were, of 

 course, made in Indiana but would probably hold good for Kansas 

 as well. ■ 



May 3, 1901, M. W. Blackman and M. Truehart secured a female 

 of C. diogenes. The swimmerets were loaded with eggs in a not 

 very late stage of development. 1 examined the same ditch four 

 days later. There were many burrows in the bank but no adult 

 individuals were taken. This would seem to indicate that the eggs 

 passed through the most of the stages of their development while 

 the animals are in the burrows, as is certainly the case with C. 

 gracilis. The females of C. iniinunis must also pass the winter with 

 their eggs in the burrow, but come out early in the spring to com- 

 plete the process of hatching. C. gracilis probably lays its eggs 

 while in the burrow and when the ponds dry up early in the fall. 

 C. immunis perhaps does also. 



C. diogenes is one of our large species, the specimen from Doug- 

 las county being nearly no mm. in length. 



C. diogenes will probably prove to be one of the widely distributed 

 species. I have material from near Boulder, Colorado, kindly sent 

 me by Professor Ramaley of the University of Colorado. C. dioge- 



