75 



(Marsh); Fox River, Algonquin, McHenryCo; Alliens, Menard 

 Co. (Nasou); Southern Illinois (Ulllers); Fulton (Jo. (Wolf); 

 Havana, Mason Co. (State Laboratory). 



Subgenus Pterosygna Rafinesque. 

 Symphynota complanaUi Barnes. 



Savanna, Carroll Co. (Baker); Cook (Jo. ( Baker, Calkins, Jen- 

 sen); Northern Illinois (Calkins); Peoria, Peoria Co. (Cham- 

 berlain); Mazon Creek, Grundy Co. (Dilg) ; Hickory Creek, 

 Will Co. (Ferriss, Handwerk) ; Starved Rock, La Salle Co. 

 Illinois River (Handwerk); Kappa, Woodford Co. (Hart) ; Mis- 

 sissippi River, (^uincy, Adams (Jo. (Hart, Nason); Winnebago 

 Qo. ; Kaskaskia, Big Muddy, and LittleWabash rivers (Hinkley ) ; 

 Spoon River; Illinois River (Kelly, Strode) ; Mercer Co., Missis- 

 sippi River (Marsh); Athens, Menard Co. (Nason); Southern 

 Illinois (Ulff'ers); Fulton Co. (Wolf); Havana, Mason (Jo. 

 (State Laboratory). 



Genus Alasmidonta Say. 

 Subgenus Pressodonta Simpson.* 

 Alas7)i!donta calceola hea, {~ deltoidea Lea). 



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

 Hickory (^'reek, Joliet, Will Co. (Ferriss, Handwerk); Mack- 

 inaw River, Kappa, Woodford (Jo. (Hart); Kishwaukee River 

 and Kent's Creek (Hinkley) ; La Salle Co. (Huett) ; Mercer Co., 

 Edwards (Jreek, Wabash River (Marsh); Algonquin, McHenry 

 Co; Athens, Menard ('o. (Nason); Spoon River (Strode); Ful- 

 ton Co. (Wolf). 



Subgenus Iiugifcra Simpson. 



Alasmidonta marginata Say. 



Cook Co. (Baker, Higley); Northern Illinois; Fox River 

 (Calkins); Hickory Creek, Will Co. ( Ferriss, Handwerk) ; Illi- 

 nois River (Handwerk); Mackinaw River, Kappa, Woodford 

 Co. (Hart); Winnebago Co. (Hinkley) ; Mercer Co., Mississippi 

 River (Marsh) ; Athens, Menard Co. (Nason) ; Fox River, Dun- 

 dee, Kane Co. (Nason, Swick) ; Spoon River (Strode); Ful- 

 ton Co. (Wolf) ; Havana, Mason Co. (State Laboratory). 



*Al(ixiiii(l<iiita hi'lij-iKliiii Lea is reported from Soutlierii Illinois l)y Ulffers. As this 

 species is confined to the Atlantic states from Maine to Virginia, tliis reference 

 must rest upon a misidentilication. 



