(24) 



1. The crust covering cephalo-thora^ oi^ back and sides. 2. Under surface 

 of head betwee.i the lower antennae. 3. Furnished with nippers. 4. Projec- 

 tion from front of head, between antennae. 5. In the male crawfish the first ab- 

 dominal legs are stifl" and unlike theothers; in the female similar to the others, 

 but rudimentary. 6. Space on back of thorax between the two longitudinal 

 curved lines. 7. Ridged longitudinally. 8. The many-jointed terminal 

 part of antennae. 9 Front pair of jaws. 10. Jointed feelers. 11. Joint 

 preceding hand. 12. Hind pairs of jaws. 13. The thick, longer-jointed 

 basal part of antennae. 14. A very short flagellum attached beside the 

 principal one. 15. Side-plates concealing attachment of legs. 16. Last 

 joint claw-like, shutting against the enlarged preceding joint like the blade 

 of a pocket-knife against its handle. 17. Rudimentary last segment of the 

 body. 18. Under surface of the body between bases of the thoracic legs. 

 19. Undivided basal joint of leg. 20. Pair of appendages at tip of ab- 

 domen. 21. The strong, jaw-like organs in front of head . 22. The forked 

 tip of the abdomen. 



APPENDIX. 



Descriptions of the following extra-limital species are added for the 

 purpose of calling the attention of collectors to them, as it is very likely 

 that they will be found in the state. The descriptions of crawfishes are fur- 

 nished by Mr. Bundy, who has made a careful study of the species of 

 Cambarus found in this and adjoining states. 



C. sloanv, Bundy. Rostrum quadrangular, subdeflexed, slightly concave, 

 toothed in front, acumen long, acute, straight, cephalo-thorax, finely punctate 

 above, granulate on sides, front margin angulated, lateral tooth long, acute ; 

 epistoma wider than long, narrower in front, concave below, apex emargi- 

 nate ; third maxillipedes smooth below, haii'y within, hands short, thick, 

 wide, smooth, fingers short, straight, not gaping at base, generally tipped 

 with black, arm and wrist nearly smooth, at most with a few blunt teeth ; 

 third legs with third joints hooked : firsf abdominal legs short, bifid, outer 

 part slightly longer, flattened, bent outward at apex, slightly recurved, 

 acute, tubercles at inner base small, inter-pedal space once and one-half 

 longer than wide. The female has ventral ring rhomboid, posterior angle 

 swollen, irregularly tuberculate, fissure transverse, anterior angle depressed. 

 Habitat : Southern Indiana, Kentucky {Dr. Sloan). 



C. dchilis, Bwuly. Rostrum wide, quadrangular, subdepressed, concave 

 above, foveola at base, margins nearly parallel, anterior teeth prominent, 

 acumen acute, flat, smooth, cephalo-thorax subdepressed, punctate above, 

 granulate on sides, Uxteral tooth acute, dorsal area narrow, wider behind. 



