GEOGRAPHICAL DISTRIBUTION. 161 



33. C. cornutus. 



Keutucky : 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. 

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

 Michigan : Detroit River, Detroit. 

 Wisconsin : iVIilwaukee. 

 Minnesota : Richfield, Hennepin Co. 

 Iowa : West Liberty. 

 Missouri : St. Louis. 

 Kansas : Leavenworth ; Ellis. 

 Wyoming : near Laramie. 

 Alabama : Huntsville. 

 Mexico : Orizaba. 

 VaE. spinirostris. 



Tennessee : Obion Co. 



37. C. Mississippiensis. 



ISIississippi : Macon. 



38. C. Palmeri. 



Tennessee : Obion Co. 



39. C. Alabamensis. 



Alaliiuna :, Waterloo, Lauderdale Co. 



40. C. compressus. 



Alabama : Lauderdale Co. 



41. C. laaoifer. 



Mississijjpi : Root POud. 



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: Brandy wine Creek ; Scliuylkill ; 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. 

 — ?-take Erie.- 



? Lake Superior. 



21 



