A List of the Crustacea of Wisconsin. 181 



trum. The specimen has peculiar hooks on third segment of 

 second pair of thoracic legs. 



C. propinquus (Girard) is also a very abundant species, generally 

 found in company with C. virilis. It is our smallest species.-. Of 

 hundreds in my collection from various parts of the state, the 

 largest measures oaly two and one-fourth inches from tip of telson 

 to tip of rostrum. 



0. plucidus (Hagen) occurs sparingly in Fox river, from which 

 stream I have received a single individual. 



C. rusticus (Girard) has been found in Lake Superior. 



C. wisconsinerds (Bundy). Bui. No. 1, lU. Mus. Nat. Hist., 1876. 

 Bostrum wide at base, much narrower in front, not depressed, 

 slightly concave above and nearly smooth, margins not elevated 

 above eyes, acumen short; cephalothorax oval, punctate above 

 and granulate on sides ; lateral teeth but slightly developed ; 

 areola narrow, wider behind; antennas slender, shorter than body; 

 epistoma variable, wider than long, lateral angles prominent; 

 third maxillipedes bearded within, and below at base only ; car- 

 pus with a group of small sharp teeth on inner margin ; two rows 

 of teeth on lower aspect of brachium ; third segment of third 

 thoracic legs hooked ; first abdominal legs of male long, thick, 

 bifid, nearly straight, reaching when folded under thorax to base 

 of first pair of legs ; external ramus longer, with recurved tip, 

 inner ramus swollen near short, acute, obliquely incurved apex. 



Eacine and Normal, 111. : 



C. dthilis (Bundy). Bulletin No. 1, 111. Mus. Nat. Hist., 1876. 

 This crawfish was found in the Little Baraboo river at Ironton, 

 in j^company with C. p)''^opinquus. A single individual was also 

 found in the Wisconsin river at Sauk City. 



Rostrum wide, quadrangular, slightly concave above, teeth 

 prominent, margins nearly parallel, acumen short and flat; cepha- 

 lothorax slightly depressed, punctate above, granulate on sides; 

 lateral teeth acute ; dorsal area narrow, widest behind ; antennal 

 plates somewhat longer than rostrum ; antennee slender, reaching 

 to base of telson ; epistoma wider than long, truncate ; third max- 

 illipedes baibate on inner and lower sides; bands with two rows 

 of teeth on inner margins ; contiguous margins of fingers tuber- 



