148 



Cincinnati Society of Natural History. 



Fig 1. Approximate area in North America over which Missus leucopterus occurs in 

 greatest abundance. 



As illustrating this habit in Ohio, I may state that in 1894, I 

 found it quite abundant in Champaign, Logan and Hardin counties, 

 with its greatest abundance in the latter and Wyandot county, to the 

 northeast, the two latter being of a more level topography than the 

 two former. In 1895, tne area °f greatest abundance included only 

 Wyandot and a portion in Hardin counties, Champaign suffering but 

 little, while to the south of Green and Clarke counties, where, in 1894, 

 I had found it sparingly, it did not occur in abundance at all, thus 

 showing that it had drifted to the lower and natter lands to the east, 

 except in Wyandot and a portion of Hardin, where these conditions 

 already obtained, and overrun a wide range of practically flat country 

 having a clay soil. A portion of the state lying to the west and north- 

 west of Lake Erie, being the ancient bed of the preglacial lake, and 

 the soil sandy instead of clayey, was little if at all infested, whereas, 

 the flat, clay lands, to the south and west were in some localities liter- 

 ally overrun with these insects. Now while the species appears to 

 inhabit low, flat lands, by preference, there is one phenomenon that 

 is seldom mentioned by those writing or speaking of its habits, and 



