ORNITHol'TERA. 



Genus II. ORNITHOPTERA Boisd. 



Boisd. Faune de FOceanie, t. 4. f. 1. (1832). 



Troides IMm. Verz. bet Schmett. 87. (1816).* 

 Amphrisius Sivainson, Zool. III. 2d ser. t. 98. (1833). 



Head large. 



Eyes large, round. 



Maxillae of moderate length. 



Labial Palpi closely pressed to the forehead, short, obscurely triarticulate, covered with long hairs, 

 the basal and apical joints very small, especially the former, which is barely discernible. 



Antennae very long, gradually clavate ; the club arched, slightly tapering towards the apex. 

 Thorax very stout, the prothorax very distinctly developed. 



Anterior Wings powerful, elongate, triangular ; upper disco-cellular nervule about equal in length to 

 the space between the two discoidal nervules ; third median nervule mostly thrown off exactly 

 opposite the end of the cell ; median and submedian nervure connected by a baseo-median nervule. 



Posterior Wings small in proportion to the anterior, subtriangular ; the costa slightly rounded ; the 

 outer margin rounded, dentate ; precostal nervure two-branched, the inner branch bent down- 

 wards and united to the costal nervure. 



Legs strong, elongate. Anterior Tibia? with a very stout spur. Tarsi with the first joint about 

 equal in length to the rest combined; fourth joint shortest; second, third, and fifth nearly 

 equal. Claws simple, strong. 

 Abdomen elongate, stout, the last segment always furnished in the males with two very large 

 valves. 



Lar va tuberculate ; the tentacula contained in a fixed bifid sheath. 

 Pupa stout, slightly arched, tuberculate ; head bifid. 



The species composing this genus are so closely allied to Papilio, that the propriety of separating them seems almost 

 questionable. In the larva state they differ in having an external forked sheath for the prothoracic tentacula. The 

 perfect insects have the prothorax more developed ; the abdomen larger, longer, and very deeply grooved below ; and the 

 valves of the last segment far larger than in any species of Papilio. 



The Larva?, of which the discovery is due to Dr. Horsfield, resemble those of Thais and of some Papiliones in being 

 tuberculated. The Pupa has the peculiarity of not being surrounded by a transverse band, but sustained by a silken 

 thread on each side, attached to a small lateral tubercle. t 



* Hiibner's name, Troides, cannot be retained. Vide Linne, Phil. Rot. 226. 

 f Boisd. Sp. Gen. i. 173. 



