GEOGRAPHICAL DISTRIBUTION. 161 



33. C. cornutus. 



Kentucky : Green Eiver, 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 Eiver ; Fall Creek, Indianapolis ; Long Lake, Kendallville. 

 Illinois : Aux Plains ; Belleville ; Lawn Eidge ; Normal ; Oquawka. 

 Michigan : Detroit River, Detroit. 

 Wisconsin : Milwaukee. 

 Minnesota : Eichfield, Heunepin Co. 

 Iowa : West Liberty. 

 Missouri : St. Louis. 

 Kansas : Leaven worth ; 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. 



41. C. lancifer. 



Mississippi : Eoot Pond. 



42. C. affinis. 



New York : Niagara. 



New Jersey : Schooley's Mountain and Dover, Morris Co. ; Eed Bank, Monmouth 

 Co. ; Trenton, Mercer Co. ; Camdeu Co. 



Pennsylvania : Brandywine Creek ; Schuylkill ; Eeading ; Philadelphia ; Bristol ; 

 Susquehanua Eiver ; Bainbvidge ; Carlisle. 



Maryland : Cecil Co. ; Harford Co. ; Havre de Grace ; Baltimore Co. ; Anne Arun- 

 del Co. ; Montgomery Co. ; Potomac Eiver, Charles Co. ; Williamsport, Wash- 

 ington Co. ; Cumberland, Alleghany Co. 



District of Columbia : Potomac Eiver, Washington. 



Virginia : Potomac Eiver, Gunston, Fairfax Co. 



? Lake Erie. 



? Lake Superior. 



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