GEOGRAPHICAL DISTRIBUTION. 161 
33. C. cornutus. 
Kentucky : Green River, near Mammoth Cave. 
34. C. hamulatus. 
Tennessee: Nickajack Cave. 
Group IV. 
35, C. medius. 
Missouri: Irondale, Washington Co. 
36, C. immunis. 
New York. 
Indiana: White River; Fall Creek, Indianapolis ; Long Lake, Kendallville. 
Tlinois: Aux Plains; Belleville; Lawn Ridge; Normal; Oquawka. 
Michigan : Detroit River, Detroit. 
Wisconsin: Milwaukee. 
Minnesota: Richfield, Hennepin Co. 
Towa: West Liberty. 
Missouri: St. Louis. 
Kansas: Leavenworth; Ellis. 
Wyoming: near Laramie. 
Alabama: Huntsville. 
Mexico: Orizaba. 
VAR. spinirostris. ; 
Tennessee : Obion Co. 
37. C. Mississippiensis. 
Mississippi: Macon. 
38. C. Palmeri. 
Tennessee : Obion Co. 
39. C. Alabamensis. 
Alabama: Waterloo, Lauderdale Co. 
40. C. compressus. 
Alabama: Lauderdale Co. 
Al. C. lancifer. 
Mississippi: Root Pond. 
42. C. affinis. 
New York: Niagara. 
New Jersey: Schooley’s Mountain and Dover, Morris Co.; Red Bank, Monmouth 
Co.; Trenton, Mercer Co. ; Camden Co. 
Pennsylvania: Brandywine Creek; Schuylkill; Reading; Philadelphia; Bristol ; 
Susquehanna River; Bainbridge; Carlisle. 
Maryland: Cecil Co.; Harford Co.; Havre de Grace; Baltimore Co.; Anne Arun- 
del Co.; Montgomery Co.; Potomac River, Charles Co.; Williamsport, Wash- 
ington Co.; Cumberland, Alleghany Co. 
District of Columbia : Potomac River, Washington. 
Virginia: Potomac River, Gunston, Fairfax Co. 
? Lake Erie. 
? Lake Superior. 
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