188 PAPERS BY DR. B. CLEMENS. 



a streak of the same hue along the inner margin, with its 

 hinder end turned up obliquely towards the costa. Hind- 

 wings dark brownish. 



Taken on wing 18th of July. 



The venation of Eudarcia, Tenaga and Hybroma is much 

 alike, particularly that of the hind-wings ; the species in- 

 cluded in them are congeneric, and to the group thus formed, 

 that of Diachorisia may be likewise added. If we disregard 

 the significance of venation, the number of genera can be 

 reduced. But nature does not make variations of structure 

 without attaching to the change some difference of habit, some 

 distinction in the biography of the individual. I have no 

 doubt of the naturalness of the genera, and they are probabl y 

 peculiar to our own country. 



[Here follows a description of a TORTRIX, Dysodia 

 margaritana. H, T. S.] 



