108 



and P'ourth lakes, Lake Co.; Pekin Lake, Tazewell Co. : Ha- 

 vana, Mason Co. ; Fulton Co. ; McHenry ( 'o. ; Lake Michigan, 

 Cook Co. ; Northern Illinois; Camp Point, Adams Co. (State 

 Laboratory ) . 



Subgenus Hiiipeutis Agassiz. 

 Section Menelnn H. & A. Adams. 

 I'lanorbis e.raenoiiK Say ( = exncutus of authors). 



Joliet, Will Co., Desplaines River (Ferriss) ; Winnebago Co. 

 (Hinkley) ; Mercer Co. (Marsh) ; Chicago, Cook Co.; Algonquin, 

 McHenry Co.; Illinois River (Nason); Fulton Co. (Wolf); 

 Quiver Lake and Havana, Mason Co.; Pistakee, Fourth, Fox, 

 Sand, Long, Cedar, and Slough lakes, and l)etween Cedar and 

 Loon lakes. Lake Co. ; Urbana, Champaign Co. ; Flag Lake, 

 Fulton Co. (State Laboratory). 



Subgenus Gip'aulus Agassiz. 

 Planoi'his alius Miiller (= hirxuhts Gould). 



Rockford, Winnebago Co.; Du Bois, Washington Co. (Hink- 

 ley); Algonquin, McHenry Co. ( Nason ); Pistakee and Cedar 

 lakes. Lake Co.; Northern Illinois (State Laboratory). 



Plaiun'Jils detlectits Say. 



Cook Co. (Baker, Nason) ; Northern Illinois (Calkins); La 

 Salle Co. (Calkins, Huett) ; Desplaines River (Ferriss); Win- 

 nebago Co. (Hinkley) ; Will Co. (Marsh) ; Silver Lake and Al- 

 gonquin, McHenrj' Co. (Nason) ; Fulton Co. (Wolf) ; Cedar, Fox, 

 and Pistakee lakes. Lake Co.; <^>uiver (Jreek and Quiver and 

 Dogfish lakes. Mason (Jo.; McHenry Co. (State Tjaboratory ). 

 Section Ti<riiiih Ball. 



Plnnorhis pitnuis Say. 



Cook Co. (Baker, Calkins, Lyon, Nason); Northern Illinois 

 (Calkins); La Salle Co. (Calkins, Huett ): Desplaines River 

 (Ferriss); .loliet. Will Co. (Ferriss, Handwerk) ; Romeo, Will 

 Co. (Handwerk): Rockford, Winnebago Co. (Hinkley); Mercer 

 Co. (Marsh ); Algonquin, McHenry Co.; Quincy, Adams Co.; 

 Athens, Menard Co.; Elgin, Kane Co. (Nason); Fulton Co. 

 (Wolf) ; 'riionqjson's Lake, Fulton C'o. ; ()uiver. Dogfish, and 

 Matanzas lakes and Slough, Havana, Mason C'o. ; Cedar, Pis- 

 takee, Sand, Fox, Fourtli, and Slough lakes. Lake Co.; Urbana, 

 Champaign Co. (State Laboratory). 



