PSEUDOSCADA. 55 
Kcuador in our collection, and found them to agree exactly. We have no other evidence 
of the existence of the insect in Central America. 
PSEUDOSCADA (gen. nov.). 
Lower discocellular of secondaries of male placed at right angles to the third segment 
of the median nervure, slightly curved and atrophied at its upper end, lower radial very 
slender; middle and upper discocellular, upper radial, and subcostal very strong; costal 
nervure atrophied, scarcely perceptible as a spur on the subcostal at about one third of 
its length from the base; ends of upper radial and subcostal free, not uniting as in 
Hymenitis. Three discocellular nervules present in the female; both upper and lower 
radials with separate origin. Tarsus of front leg of female with five joints, a pair of 
spurs on each of the first, second, and third joints. (Type Ithomia pusio, Godm. & 
Salv.). 
Though at first sight very similar in structure to Hymenitis, this genus presents 
so many differences that its separation seems necessary. The atrophy of the costal 
nervure in the secondaries of the male is not found in any other group, so far as we 
know; and the subcostal and upper radial having free ends is another divergence from 
Hymenitis, from which it also differs in the neuration of the secondaries of the female, 
which (in Pseudoscada) has the full complement of nervules. 
1. Pseudoscada utilla. (Jthomia pusio, Tab. V. figg. 18, 14.) 
Ithomia utilla, Hew. Ex. Butt., Ith. t. xvii. f. 101). 
Ithomia pusio, Godm. & Salv. P. Z.S. 1877, p. 612. 
Alis hyalinis, venis nigris divisis et fusco-nigro circumdatis (ad apicem anticarum paulo latiore), macula sub- 
trigona ad cellule finem vittaque obliqua alba ultra eam a costa erga marginem externum extensa: 
subtus ut supra, sed coloribus opacis ferrugineis, anticarum apicibus atomis duabus minutis albis pictis. 
mari similis, sed alarum marginibus paulo latioribus. 
Hab. Nicaracua, Chontales (Belt, Janson?); Costa Rica (Van Patten), Irazu 
(Rogers); Panama, Veraguas (Arcé).—ConomBia!; Ecuapor. 
When describing /thomia pusio*, we compared it with Ithomia andronica, Hew., a 
Species to which, except in its smaller size, it has a strong outward resemblance. A 
further examination of its wing-structure shows that its relationship with I. andronica 
is not really at all near, and that it cannot be separated specifically from I. utilla, Hew., 
under which name we now place the insect. 
A common species in Nicaragua and Costa Rica, P. utilla is absent from the line of the 
Panama railway, but reappears again in South America, being found both in Colombia 
and Ecuador. | 
Our descriptions and figures are taken from Nicaraguan specimens, the types of 
I. pusio. 
