24 PA1TLI0NID/E. 



Genus V. EURYCUS Boiid. 



Boisd. Sp. Gen. i. 391. (1836). 



Oressida Swainson, Zool. III. 2d ser. t. 94. (1832). 



Hi: ad large. 



Eyes oval, prominent. 



Maxilla' of moderate length. 



Labial Palpi very short, triarticulate ; basal joints very short ; second elongate, curved, tapering 

 towards the apex ; third joint very short, oval. 



Antenna gradually clavate, not arched. 

 Thorax not remarkably stout. 



Anterior Wings diaphanous, with opaque markings in the males, elongate, triangular, rounded at 

 the apex ; third subcostal nervule thrown off at the end of the cell ; upper disco-cellular nervule 

 about equal to the space between the two discoidal nervules ; median and submedian nervures 

 connected by a baseo-median nervule. 



Posterior Wings ovate, dentate, inner margin in the males much excised ; the precostal nervurc 

 branched, its inner nervule directed towards the base, the outer anastomosing with the costal 

 nervure, which is combined at its origin with the subcostal, then directed anteriorly, until it 

 meets the precostal nervule, thus forming a basal areola of considerable size, afterwards it is bent 

 at a right angle, and assumes the appearance of a continuation of the precostal. Cell elongate. 



Legs elongate, especially the first and second pairs. Anterior Tibia 1 long, with a very distinct 

 curved spur before the middle. Tarsi, especially the anterior and middle, longer than the tibiae, 

 spiny; basal joints in all longest; second, third, and fourth j>rogressively shorter ; fifth joint longer 

 than the third : anterior and middle tarsi of the males rather enlarged, fringed on each side 

 with stout spines. Claws long, simple. 

 Abdomen rather clavate in the male, the last segment with two corneous valves below, and a curved 

 triangular process above; in the female with a corneous pouchdike appendage. 



Larva and Pupa unknown. 



As yet only one species of this curious genus is known. It appears to be confined to Australia, being most plentiful 

 in the warmer parts of that continent. Of its habits we know nothing, except that its flight is not strong. From 

 Papilio it is at once distinguished by its antenna 1 , which only differ from those of Parnassius in being more elongate ; 

 by the greater size of the basal areola of the posterior wings; the form of the tarsi, which strikingly remind us of those 

 of the Neuropterous genus Bittacus; and by the abdominal pouch of the female. This last character, its diaphanous 

 anterior wings with black spots in the cell in the males, and its straight antenna', show its close affinity to Parnassius: 



