250 Canadian Record of Science, 



Evening Grosbeaks in unusual numbers in this migration 

 of 1890, though they probably came from the North 

 rather than the West. Flocks of both birds were seen in 

 many places feeding together on the berries of the same 

 mountain ash tree, and all of them were remarkably tame 

 and unsuspicious. 



Notes on Recent Canadian Unionid^e. 



By J. F. Whiteaves. 1 



The present paper is intended as a contribution to 

 our knowledge of the geographical distribution of the 

 Unionidre in North America. It consists of a list of all 

 the species from Canadian localities that are now repre- 

 sented in the museum of the Geological Survey at Ottawa, 

 and is based almost exclusively upon specimens that were 

 either collected by members of the Survey staff' or pre- 

 sented by friends interested in its museum. So far as 

 the writer is aware, however, the Unio tcnnissimus of Lea, 

 which was collected by Dr. G. M. Dawson in 1873, in the 

 Souris Eiver, Manitoba, is the only species of Unionidse 

 known to occur in Canada that is not represented in the 

 Survey museum. Specimens of most of the nominal species 

 of Anodonta and of a few of the more difficult species of 

 Unio enumerated in this list have been kindly compared 

 by Mr. Charles T. Simpson, of the United States National 

 Museum, with Dr. Lea's types of North American Union- 

 idse now preserved in that institution, and identified as 

 correctly as the small number of shells sent from each 

 locality and the incompleteness of his studies of the family 

 would permit. The nomenclature employed throughout 

 this list is that which is now in general use among 

 students of this group in North America, as it is still 

 quite uncertain which of the earlier names of Kafinesque, 



1 Communicated by permission of the Director of the Geological Survey Depart- 

 ment. 



