62 ON THE ORNITHOPTERA CASSANDRA, 



A slib-quadrate patch of dull ochraceous colour, is 

 placed over the anal angle ; and two other spots of 

 brightish yellow are situated between the first and 

 second sub-costal nervules, near to the anterior angle. 

 Under surface similar to the upper, but the white is 

 purer, and a bright yellow replaces the ochraceous 

 tint. The margins of the wedge-shaped patches are 

 also entire. 



Head and thorax dark black-brown, the latter bearing 

 ahove a central longitudinal band of satiny green, 

 and heloiv crimson spots on each side. The abdomen 

 dark black-brown, grayish towards the tip, and 

 broadly barred underneath with yellow bands. 

 Habitat : Port Denison and Rockingham Bay, Northern 

 Australia. 



In estimating the distinctive characters, I shall limit my 

 comparisons to those species only, which are comprised within 

 Doubleday and Westwood's 1st group of the genus Ornithoptera, 

 and which exhibit the peculiar type of colouring, and occupy the 

 same geographical range of the present insect : purposely 

 excluding the 2nd group, represented by the Amphrisius, 

 Amphimedon, Darsiiis, Pompeius, and others, from their marked 

 dissimilarity. 



The Ornithoptera Cassandra differs ; from the O. Priamus by 

 being smaller ; by the males possessing on the under wings 

 small golden specks over the outer margin, instead of two large 

 ones, and by the absence of one, between the costal nervure and 

 sub-costal nervule ; by having on the underneath surface of the 

 upper wings, a distinct double row of gilded- green spots ; by 

 the females bearing a green stripe on the thorax ; by the various 

 white patches on the anterior wing being smaller and less 

 numerous ; and by the much larger spots of fuscous-brown 

 which occupy the central portions of the tear, or, wedge-shaped 

 markings on the posterior wing. 



Prom the O. Pronomus, it differs by not exhibiting in the males, 

 the central veins of metallic green, additional to the two curved 

 bands on the anterior wing ; by having four or five black spots, 

 instead of three, on the posterior wing : on the vmderneath of 



