4 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 119 



usually slightly different in size and shape; ductus bursae usually 

 with a sclerotization near ostium, absent in E. obscura (Schaus), 

 remainder broad, twisted, and irregularly furrowed; bursa copulatrix 

 membranous, lacking signa, internally uniformly spiculate, the 

 spicules extremely minute except in E. obscura. 



The immature stages and food plants of the species of Eusceptis 

 Hiibner are completely unknown. 



The genus Eusceptis Hiibner belongs to the tribe Acontiini and 

 apparently is most closely related to the genus Acontia Ochsenheuner 

 {=Tarache Hiibner). The two were separated in the "Key to the 

 Genera" (Hampson, 1910, Catalogue of the Lepidoptera Phalaenae 

 in the British Museiun, vol. 10, pp. 7 and 8) by choices "d^" and 

 "e^," the difference being whether the frons possessed a rounded 

 prominence or no prominence. The species of Acontia usually do 

 possess a more bulbous frons than the species of Eusceptis, but it is 

 a very slight difference of degree and scarcely sufficiently distinctive 

 to be considered diagnostic for these genera. In the generic diagnoses 

 in the same work, Hampson (op. cit., pp. 723 and 792), indicates that 

 Acontia (as Tarache) species have a decumbent metathoracic crest 

 which is lacking in Eusceptis (as Eugraphia) species. In some species 

 of Acontia the decumbent crest is no more developed than in the 

 species of Eusceptis. The two genera are very closely related, but 

 may be separated by the nature of the uncus of the male genitalia. 

 In Eusceptis the uncus has a row of basally directed spines along 

 either ventrolateral margin. The uncus is simple in Acontia. 



The species of the genus are essentially found m the neotropics, 

 but some species approach the temperate regions of North and South 

 America. 



Key to Adults of Eusceptis 



(Based on wing maculation) 



1. Hindwing black obscura (p. 6) 



Hindwing mostly white, orange, or yellow 2 



2. Forewing with some yellow or oraiige in the terminal area between vein Mi 



and the tornus 4 



Terminal area of forewing daric 3 



3. Dark marginal band of hindwing of male nearly uniform in width; same band 



of female usually terminating at about Cu2 effusa (p. 7) 



Dark marginal band of hindwing of male tapering toward anal angle, width 

 at Rs + Mi about twice width at CU2; same band of female reaching anal 

 angle atriora (p. 8) 



4. Outer, dark costal mark of forewing about equal in width to median mark . 5 

 Outer, dark costal mark of forewing about twice as wide as median mark . 6 



