72 
Everywhere in the Ohio valley this species seems to be quite rare and 
exceedingly irregular in its occurrence. Mr. E. W . Nelson and Mr. Otto 
Poling note it as much less common in Illinois than formerly. With 
the exception of the winter of 1868-9 and the succeeding summer I do not 
know of its having appeared in any considerable numbers in any of the 
tier of states just north of the Ohio river. 
