120 HELICONIlhE. 



the second nervule terminating at, or a little before, the outer angle. Upper disco-cellular nervule 

 in the males much curved, arising from the point where the subcostal nervure divides, directed 

 inwards, and then curved downwards to meet the discoidal nervure, which makes an angle at the 

 point of junction, and, extending into the cell, is again bent where it is joined by the straight 

 lower disco-cellular, which runs directly downwards to the third median nervule. This last is 

 bent at an obtuse angle at the point of union. Upper disco-cellular nervule in the females 

 straight, directed downwards and slightly inwards. 

 Anterior Legs of the male very small. Tibia and tarsus represented by an obovate knob, showing 

 indications of being two-jointed. Anterior Legs of the female with the tibia not quite so long 

 as the femur, nearly cylindric, slightly thickest at the extremities. Tarsus about five eighths the 

 length of the tibia, nearly cylindric ; the first joint one half longer than the rest combined, 

 cylindric ; second equal in length to the remainder, cylindric, rather broadest at the apex ; third 

 and fourth about of equal length, the former obliquely truncate, the latter rounded at the apex; 

 fifth minute, scarcely one fiftieth of the whole length of the tarsus ; second and third joints with 

 a pair of small spines at the apex, each covered by a tuft of hairs at the base of the following 

 joint. 

 Middle and Posterior Legs rather robust. Tibia? rather longer than the femora, very spiny ; the 

 spurs not very much longer than the other spines. Tarsi longer than the tibiae; all the joints 

 of equal thickness, and nearly cylindrical, very spiny ; the spines long and stout, placed in rather 

 regular series below, the lateral ones not much longer than the others ; first joint nearly one 

 half longer than the rest combined ; second joint about two sevenths the length of the first ; 

 third and fifth each two thirds the length of second ; fourth joint about two thirds the length of 

 the third. Claws strong, curved, grooved below. Paronychia with the exterior lacinia longer 

 than the claw, strap-shaped, very slender ; inner lacinia much shorter, broad, subtriangular. 

 Pulvillus jointed, broad, about equal to the claws. 

 Abdomen elongate, clavate, extending considerably beyond the posterior wings. 



Larva and Pupa unknown. 



The species on which this genus may be considered to be founded, namely Dircenna Iambe and Dir. Klugii, are 

 easily known from Ithomia by their more triangular wings, the anterior margin of which is much longer in proportion 

 to the others than in that genus. They differ too in their larger and more hairy palpi, the joints of which have not 

 the same relative length as in Ithomia. In the anterior feet of the male we find the knob representing the tibia; and 

 tarsi showing faint indications of a division into two parts, and in those of the female a structure differing very much 

 from that of any Ithomia except Ith. Melphis and Ith. Cceno. 



Were we able to limit the genus to these two species it would be easily defined, but many species exist, though few 

 are described, which partake more or less of the characters of the next genus, especially in the form of the wings. 



I had hoped to have been able to subject all or most of these species to a rigorous examination, which might have 

 led to some modifications of the, generic character ; but I have not been able to obtain enough specimens of both sexes 

 for dissection, and consequently this portion of my labours is less perfect than I could have wished. I can only hope, 

 before the close of this work, to have the power to supply its present deficiencies. 



This genus presents a sexual variation in the neuration of the posterior wings, a circumstance never, I believe, 



