71 



MESOGEN^. 



Genus Oyprogenia Agassiz. 

 Ci/prof/enia 'irrorata Lea (=stegaria Say). 



Mt. Carmel, WaliashC'O. (Calkins): Wabash River (Hinkley, 

 Marsh); Southern Illinois (Ultt'ers). 



Genus Gbliquaria (Rafinesque) Simpson. 



Obliqiiaria ret^exa Rafinesque (=<'oi'niita Barnes). 



Savanna, Carroll Co. (Baker); Cook Co. (Baker, Calkins); 

 Northern Illinois; Mt. Carmel, Wabasli Co. (Calkins); Kanka- 

 kee River (Ferriss, Handwerk) ; Shawneetown, Gallatin Co. 

 (Fischer); Meredosia, Morgan Co. (Gault); Illinois River 

 (Handwerk, Kelly, Ferriss, Strode) ; Mississippi River, Quincy, 

 Adams Co. (Hart); Little Wahash, Big Muddy, and Ohio riv- 

 ers (Hinkley) ; La Salle Co. (Huett) ; Mercer Co., Mississippi 

 River (Marsh) ; Athens, Menard Co; Mississippi River, Quincy, 

 Adams Co. (Nason); Spoon River (Strode); Southern Illinois 

 (Ultt'ers); Fulton Co. (Wolf); Havana, Mason Co. (State Lab- 

 oratory). 



PTYCHOGENiE. 

 Genus Ptychobranchus Simpson. 

 Ptychohraneliiis pluiseolus Hildreth. 



Wabash River (Hinkley, Marsh) ; Southerti Illinois (Ulffers). 



ESCHATIGEN.ffi. 



Genus Dromus Simpson. 



Droinus dromus Lea. 



Ohio River (Marsh). 



DIAGENiE. 



Genus Strophitus Rafinesque. 



Strophittis edentuhis Say (=shaffefiana Lea, irardiana Lea). 



Oregon, Ogle Co. : Savanna, Carroll Co. (Baker); Cook Co. 

 (Baker, Higley, Jensen, Lyon); Northern Illinois (Calkins) ; 

 Peoria, Peoria Co. (Chamberlain); Hickory Creek. Will Co. 

 (Ferriss, Handwerk) ; Du Page River (Gault) ; Desplaines Riv- 

 er (Handwerk); Rockford, Winnebago Co.; Kaskaskia and 

 Wabash rivers (Hinkley); La Salle Co. (Huett); Illinois Riv- 

 er (Kelly, Nason); Mercer Co.; Mississippi and Wabash riv- 

 ers (Marsh) ; Fox River, Dundee, Kane Co., and Algonquin, 



