DEECAS. 445 
Genus DERCAS. 
Dercas, Boisduval, in Doublcday, Geu. Diiirii. Lcp. p. 70 (1817) ; Distant, Eliop. 
Malay, p. 308 (1885). 
" Anterior wings subtriangular, the costal margin convex, the apex more or less dentate, the outer 
margin oblique, the inner margia concavely sinuate. Costal nervure terminating on costa a 
little beyond end of cell ; first subcostal nervule emitted at less than one third before end of 
cell, second near end of cell, third and fourth subcostal nervulcs bifurcating nearer end of 
cell than apex of wing, fifth emitted at about two thirds the distance between end of cell and 
bifurcation of third and fourth ; upper discocellular nervule concave and a little less than 
one half the length of lower, which is directed outwardly towards its base ; upper median 
nervule convexly rounded at base and emitted from end of cell ; second from a little before 
end of cell, lower at about one third before end of cell ; cell short and broad ; submedian 
nervure somewhat bent inwardly near base, and then outwardly along its apical half. 
Posterior wings elongately and irregularly subovate ; costal margin obliquely convex, outer 
margin prominently and angularly produced at upper median nervule, from whence to anal 
angle the margin is more or less concavely sinuate. Costal nervure short, extending to about 
half the length of costal margin ; first subcostal nervule emitted at about one fourth before 
end of cell, second from end of cell ; upper median nervule short and oblique, lower more 
than twice the length of upper and bent inwardly ; upper median nervule from end of cell, 
second emitted at about half the distance from first as from third ; submedian nervure 
.moderately bent outwardly; internal nervure bent inwardly. Body moderately robust, pro- 
notum pilose; antennae short, with a gradually formed but distinct apical club ; palpi short, 
compressed, broad, and clothed with long adpressed hairs, apical joint minute. 
" This genus is of small extent, and may be taken as an Eastern representative of the genus 
Gonejilerijx. Dercas is found in Continental India, the Indo-Malayan region, and in China. 
One species inhabits the Malay Peninsula." (^Distant, I. c.) 
Dercas wallichii. (Plate XXXV. fig. 3, d .) 
Gonepteryx wallichii, Doubleday, Proc. Ent. Soc. Lond. v. p. xlvii. (1848). 
Gonepteryx urania, Butler, Proc. Zool. Soc. Lond. 1865, p. 458, pi. xxvi. fig. 5 ? . 
"Alls omnibus laete flavis, anticis apic* acuminate nigro, macula pone medium rotundata nigra ; 
posticis rotundatis. 
" Exp. alar. 2^ unc, vel 62 millim. Habitat, India sept. 
" Head black. Antenna; reddish. Thorax black, clothed thinly with yellow hairs. Anterior 
ivinys acuminate, falcate, the outer margin slightly sinuate below the apex, above pale bright 
yellow, the apex marked with a black patch trisinuate internally, the middle sinus deep, the 
others much slighter ; the termination of the costal nervure, and also of the first and second 
subcostal nervules, marked with a small black dot; two small black dots on the outer margin, 
and a large rounded spot, bordered below with ferruginous, between the first and second 
median nervules, not far from their origin. Posterior wings rounded, pale, bright yellow, 
the terminations of the nervules marked with a small black dot. Below all the wings paler 
than above, sprinkled with small ferruginous atoms, the discocellular nervule of both wings 
marked with a geminate ferruginous spot, bipupilled with silver; the anterior wings marked 
