64 



NEW YOBK STATE MUSEUM 



Ohio. 



Ohio river, Cinn Beecher. 



Michigan. 



Grand Rapids , State coll. 



Generally distributed , Walker. 



Indiana. 



Marsh. 



Illinois. 



Several localities Hinkley. 



Wisconsin. 



Marsh. 



Iowa. 



Boone ' Beecher. 



Muscatine Walker. 



Kansas. 



Eastern portion Quintard. 



Missouri. 



Marsh. 



Kentucky. 



Marsh. 



Anodonta edentula and Anodonta undulata will, I think, 

 eventually be united as one species. The usual custom has been 

 to call specimens from eastern localities An. undulata, and to call 

 western specimens An. edentula. But several correspondents 

 have given eastern localities for the western species, and western 

 localities for the eastern species, showing that opinions vary as 

 to the validity of the geographical distinction. In making up 

 the lists of localities for these two species I have rejected several 

 localities reported to me outside of the generally accepted limits 

 for the two species respectively. An exception has been male 

 for edentula in the case of the localities reported by Prof. R. Ells- 

 worth Call, who has reported An. edentula as occurring in Otsego 

 county and Mohawk river, just within the boundary between the 

 St. Lawrence and Eastern drainage systems, and for An. undulata 

 in the case of Onondaga lake, reported by Rev. W. M. Beauchamp, 

 a locality just within the boundary of the St. Lawrence drainage 

 system. If the two species are to be considered as the same, 

 the two lists of localities will show the distribution of the united 

 species. 



