ITHOMIA. 123 



Posterior Wings elongate ; the anterior nearly thrice the length of the inner margin. Cell 

 extending beyond the middle of the wing. Costal and subcostal nervures closely approximating 

 to one another and to the anterior margin. Lower disco-cellular nervule always making nearly 

 a right angle with the third median nervule. 



Anterior Legs in the male very short ; the tibia and tarsus only represented by a simple ovate 

 knob, not showing any signs of articulation. Anterior Legs of the female rather long ; the tibia 

 not quite so long as the femur, both slender. Tarsi with the basal joint long; the second, third, 

 and fourth generally transverse, mostly all armed with a spine at the apex ; fifth joint, when 

 present, small, pointed. 



Middle and Posterior Legs mostly rather slender ; the tibiae equal in length to the femora, spiny ; 

 the spines short and not very numerous, the spurs small. Tarsi longer than the tibiae, spiny ; 

 the spines at the sides longer and more regularly placed than those of either the upper or under 

 surface. First joint longer than the rest combined ; second nearly cylindric, equal to the third 

 and fourth combined, these two and the fifth rather broader and slightly depressed ; the fourth 

 much the shortest, rather broader at the apex than at the base ; fifth elongate, oval. Claws 

 rather short, curved, grooved below. Paronychia with the outer lacinia slender, lanceolate, 

 almost linear, not quite so long as the claws ; the inner lacinia very short, rounded. Pulvillus 

 jointed, nearly as long as the claws. 

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



Larva and Pupa unknown. 



The genus Ithomia, as here defined, contains insects of very different external appearance, and I have on that account 

 felt much hesitation in uniting them together. It is only after long and repeated examinations of both sexes of a 

 majority of the species known to me, that I have resolved to include them under one generic group, subdividing them 

 into sections or subgenera, and giving names to these, as in some previous genera. 



The principal reason which has induced me to follow this course is the fact that the most important differences 

 of structure, except in two species, are confined to one sex, the fore feet of the females being the parts that offer the 

 chief variations in structure. 



Whilst the anterior tibia? and tarsi of the males are represented only by a simple more or less ovate knob, possibly 

 answering to the tibia only, the females have them much developed. In general, the tarsus, taken as a whole, is 

 slightly clavate ; the first joint much longer than the rest combined ; the three following transverse, much broader 

 than the first ; the fifth if present, very minute. The apex of the first, second, and third joints is generally furnished 

 with a pair of stout spines, each pair covered more or less by a tuft of hair at the base of the following joint. 

 Sometimes, I believe, the spines are wanting on the basal joint. In Ithomia Iphianassa the tibia is very slender, 

 slightly thickened at the apex ; the tarsus has the first joint extremely long, cylindrical ; the second and third very 

 short, twice as broad as the first, furnished at the apex with long spines ; the fourth very short, nearly as broad, not 

 spinigerous ; the fifth much smaller, but very distinct, obovate, slightly emarginatc below. Ithomia Cccno, which, like 

 Ith. Melphis, is distinguished from the rest of the genus by having the second subcostal nervule thrown off exactly at 

 the end of the cell, differs materially in the structure of these tarsi from the other species of the genus which I have 

 examined, and in this respect comes near to Dircenna. They are four-jointed : the first joint is cylindric, rather 

 smaller than the slightly clavate apex of the tibia, it has no apical spines but several slender short ones scattered 

 along it, its length is not quite one half more than that of the rest combined ; the second, third, and fourth, likewise, 

 are nearly cylindric, none of them transverse ; the third more than two thirds, the fourth more than half, the length 

 of the second, the former is obliquely truncate, the latter rounded at the apex ; the second and third have a pair of 

 moderately long spines at the apex. Ithomia Melphis, also, has the tarsi, as a whole, cylindrical, but five-jointed ; 



November, 1 84-7- L L 



