07 
Genus ORNITHOPTERA. 
The present generic group was first separated from 
Papilio by Dr. Boisduval. None of its characters, 
taken singly, are very strongly marked, but their 
aggregate importance is sufficiently considerable to 
authorise its adoption. As in Papilio the antennre 
form an elongate club, having the extremity slightly 
curved upwards, the palpi are longer than in the 
genus just named, but they never rise above the, 
forehead. The protliorax is much developed an- 
teriorly, and forms a pretty distinct neck. The 
abdomen is long and robust, that of the male deeply- 
grooved on the under side, and provided at the anal 
extremity with tyvo large rounded valves. The 
wings are large, of a strong texture, and furnished 
yvith salient nervures ; the anterior pair elongate ; 
the posterior with wide shallow indentations, and 
never prolonged into a tail. 
We are very imperfectly acquainted with the 
natural history of the insects of this group in their 
early stages. Their remote localities, and the rarity 
of most of the species, have, for the most part, 
prevented them from falling under the notice of 
competent observers. The caterpillar and meta- 
morphoses of one of them (0. Heliacon ), however, 
have been described by Dr. Horsfield. Like the 
