PAPERS ON ZOOLOGY OF MICHIGAN. 



Distribution hy families. — Continued. 



Family. Number of Habitat. 



species. 



10 Northeast shore. 



25 Southwest shore. 



2 Northeast and southwest shores. 



5 Northeast shore. 



5 Southwest shore 



4 Northeast and southwest shores. 



34 Northeast shore. 



6 Southwest shore. 



3 Northeast and southwest shores. 



Calandridae 15 Northeast shore. 



Chrvsomehdae . 



Tenebrionidae 



Curcuhonidae . 



This is not a complete hst of all the families found. A few of those 

 represented by a small number of species are omitted. 



Fauna of the Beaches. The writer believes that the greater part of 

 the beetles seen on the northeast shore l^elonged to the island, that is 

 bred there, and that the beetles undoubtedly washed up on this shore 

 were either blown off the island or when flying off the shore dropped in 

 the water when tired out and were washed ashore. As will be seen 

 from the following data the wind was northeast twelve days out of the 

 fourteen and the waves came from the direction of open water in Lake 

 Huron: Jun^ 18-21 northeast, fair; June 22 southwest, fair; June 23- 

 25 northeast, fair; June 26 southwest, cloudy; July 12-13 northeast; 

 July 14 southwest, fair; July 15 northeast, variable, rain; July 16-17 

 northeast, blowing hard. Consequently the beetles would be in the 

 water many days if they came from the mainland, and in order to strike 

 the mile length of northeast shore on Charity Island, increditable 

 numbers must have been scattered over the twenty mile width of Sagi- 

 naw Bay. Also the low sandy shore on the mainland at Caseville ought 

 to have received a large number if they came from the northeast, but 

 the writer found none to speak of there. 



The ability of our beetles to live in the water varies from two hours 

 to seventy-two hours, if we except a few species of Curculionidae. By 

 making a series of experiments the writer found the period of life in 

 still water to be about as follows: Cicindela four hours. Twenty 

 species of Carabidae four to twenty hours. In about twenty hours 

 they became water-logged, most of them sinking to the bottom. Har- 

 palus caliginosus lived forty-eight hours but was dead and water soaked 

 in seventy-two hours. Elateridae, a number of species, did not live 

 three hours. Buprestidae, some species did not live ten hours, most of 

 them sinking to the bottom, but Acemaeodera pulchella was aUve and 



