THYRIDIA. 117 



Genus IX THYRIDIA. 



Thyridia, Oleria, Hubn. 

 Heliconia Latr., God'., cj'c. 

 Mechanitis Fab. 



Head rather small, about half the width of the thorax. 



Eyes round, nearly semiglobular. 



Maxillae moderately long, rather slender. 



Labial Palpi projecting considerably beyond the forehead. First joint short, subcylindric, 

 curved, clothed, as is also the second, with scales, and in front with a few shortish hairs ; 

 second joint more than twice the length of the first, subcylindric, curved slightly, tapering 

 towards the apex, which is obliquely truncate ; third joint not so long as the first, slender, 

 fusiform, scaly. 



Antenna rather more than half the length of the body, slender for about two thirds of their 

 length, with the joints elongate, then gradually thickening into an elongate club, the joints 

 of which are shorter, and mostly slightly grooved below, the apical one being pointed. 

 Thorax moderately stout. 



Anterior Wings very elongate ; the outer margin one half the length of the anterior, rounded, not 

 emarginate near the anal angle ; the posterior margin about two thirds the length of the 

 anterior, slightly sinuate, emarginate, especially in the males ; apex of the wing much rounded. 

 Costal nervure extending two thirds the length of the wing. Subcostal nervure emitting its 

 first nervule at a short distance from the end of the cell ; its second at, or a little beyond, it ; its 

 third at about an equal distance from the second, and from the fourth, which is thrown off about 

 midway between the third and the apex. Cell two thirds the length of the wing. Upper 

 disco-cellular nervule very short, or altogether wanting. Middle disco-cellular directed 

 obliquely inwards, longer than the lower, which is directed obliquely outwards. Discoidal 

 nervule extending considerably into the cell. Third submedian nervule bent at a considerable 

 angle, where it is joined by the lower disco- cellular. Internal nervure running into the 

 submedian, which is curved near its origin. 



Posterior Wings subovate, the anterior about double the length of the inner margin. Precostal 

 nervure simple. Costal united to the subcostal nervure, nearly to the point where the 

 precostal is thrown off, extending a little beyond the middle of the wing. Upper disco-cellular 

 nervule connected with the second median nervule immediately beyond its origin, directed 



