BUTTERFLIES AND MOTHS. 



405 



two wings of each, side practically become one member, in a manner similar to the formation 

 of many hymenopterous insects. Those species which take any nourishment subsist entirely 

 upon liquid food, which is drawn into the system by suction, and not by means of a brush, as 



Mechanitis lysimnla. 



Thecla. 

 Helicopis aqndo. 

 Mesosemia mk-ipsa. 



Gyntzcia dirce. 



Papilio thoas. 

 Epicalia ariscea. 



Calagramma marchalii. 



PapUio prolesilcius. 



is the case with the liquid-feeding- beetles and bees. The wings are strengthened by nervures, 

 which are of great use in determining the position of the insects. 



In the system which is adopted in this work, the Lepidoptera are divided into two sec- 

 tions—the Butterflies and Moths, technically called Rhopalocera and Heterocera— which may 

 generally be distinguished from each other by the form of the antenna, those of the Butter- 



