226 



PIERIDJE. 



apical third of 7, vein 10 from apex of cell, vein 11 free, from base 

 of apical third of subcostal. Hind wing : very broad, veins well 

 apart ; costa arched ; termen angulated and shortly tailed at 

 apex of vein 4, sloped obliquely outwards to that vein, thence 

 obliquely inwards to tornus and again at an angle to the middle 

 of the dorsal margin ; cell very short and broad ; upper disco- 

 cellular very short, middle slightly longer, lower very much longer, 

 concave and sloped outwards 'to lower apex of cell ; precostal spur 

 curved inwards. Antennae very short, less than one-third length 

 of costa of fore wing ; club elongate, very gradual, roundly truncate 

 at apex ; palpi short, third joint remarkably so ; eyes large and 

 prominent. 



Key to the forms of Dercas. 



a. Termen of hind wing angulated and with a well- 



marked conspicuous tooth or short tail at apex 



of vein 4 .............................. & verhuelli, p. 226. 



b. Termeu of hind wing slightly angulated at 



apex of Tein 4, but never produced into a 

 tooth or short tail. 

 a'. A conspicuous dark sienna-brown spot in 



interspace 3 of fore wing ................ D. lycorias, p. 227. 



b'. No sienna-brown spct in interspace 3 of ( D i ycoria ^^^ 

 fore g ............................ 1 decipiens, p. 228. 



626. Dercas verhuelli, Van der Hoeven (Colias), Tijdsch. voor Nat. 

 Ges. v, 1839, p. 341, pi. 8, figs. 3, 4,$ ; Doubleday (Gonepteryx), 

 Gen. Di. Lap. i, 1847, p. 71, pi. 8, tig. 3 <$ ; Moore, P. Z. S. 

 1865, p. 760 ; Elwes, Trans. Ent. Soc. 1888, p. 414. 

 Rhodocera lycorias, Doubleday in Gray's Zool. Misc. 1842, p. 77, 

 2 (nee <?). 



d 1 . Upperside : rich gamboge-yellow. 

 Fore wing : discocellulars bordered on 

 each side broadly with orange : apex 

 with a square patch of dark sienria- 

 brown which is narrowed posteriorly 

 and continued to apex of vein 1 ; the 

 inner margin of this sienna-brown 

 area angulated in interspace 5, and 

 narrowly edged along its whole length 

 with orange ; a narrow band of orange 

 that starts from the angle in inter- 

 space 5 and is inclined slightly inwards, 

 crosses the disc of the wing to vein 1. 

 Hind wing : uniform, only slightly paler 

 along the costal and dorsal marg'ins ; u 

 minute sienna-brown dot at the apices 

 of all the veins and indications of an 

 orange band in continuation of the one 

 on the fore wing crosses the disc, this 

 is very faint and is merely seen by transparency from the 



Fig. 57. Dercas verhuelli. 



