Mr. E. Doubleday on some Lepidoptera. 173 



Calcutta, and the species was said not to be rare in that quarter. 

 The natives knew it by the name of Bi^ri hangs. 



99. Anas coromandeliana, Gm., Lath. 106. Alae nigricantes re- 

 migibus omnibus apice albis, subtus alba. PoUex tenuis. ,^ superne 

 viridis nitens ; $ superne fusco-cinerea. Minor quam crecca. 



This pretty little Duck is easily recognised even during flight, 

 by a white margin to the wings, formed by the tips of all the 

 quills. The male is of a fine grass-green above. It is common 

 on the river, but I only procured a pair, which shared the same 

 fate as the Lark, no. 28, above-mentioned ; — they were destroyed 

 by ants during the night. They had only fed on vegetables. 

 [To be continued.] 



XXII. — Descriptions of neiv or imperfectly described Lepido- 

 pterous Insects. By Edward Doubleday, Esq., F.L.S., Assist- 

 ant in the Zoological Department of the British Museum, &c. 



[Continued from vol. xviii. p. 376.] 



Genus Ornithoptera. 



Orn. Poseidon. Alis supra holosericeo-viridibus, limbo nigro, anticis 

 fascia longitudinali latissima nigra, nervulis viridibus divisa ; pos- 

 ticis subtus aureo-viridibus, angulo ani aureo. Exp. alar. 6J unc. 

 vel 168 mill. 



Hab. Darnley Island. 



Above, anterior wings with the entire limb deep velvety black, 

 the disc occupied by a broad fascia of the same colour united to 

 the black margin below the apex, divided by the median nervure 

 and nervules, which are golden-green, its inner side more fuscous 

 and opake. The space between this and the limb is occupied by 

 two vittse of a bright golden or satiny green, shading to bright 

 coppery. The upper of these is narrow at the base and becoming 

 gradually wider until near the apex of the wing, when it sud- 

 denly narrows. The lower follows a direction parallel to the 

 inner margin until near the anal angle^ gradually widening to 

 this point, when it is bent abruptly upwards ; and becoming some- 

 what macular, terminates near the second discoidal nervule. Pos- 

 terior wings small, triangular, the anterior and outer margins 

 rounded ; satiny green with coppery reflections, the limb nar- 

 rowly black, the outer angle with one or more round black dots, 

 and generally near the outer margin is a series of round orange 

 spots between the nervules. 



Below, the anterior wings have the limb black, broadest on 

 the costa, with a slender green vitta below the third and also the 

 fourth subcostal nervule, all the interstices below the fifth sub- 



