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 lyswnnia. Cfyncecia dirce. Catagramma marchdlii. 
Theda. 
Helicopis cupido. Paptlio thoas. 
Mesosemia misipsa. Epicalia anseea. PapUio protesildus. 
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 antennae, those of the Butter- 
