PIERINiE. 
7 
BoiscL, P. Ahjssinica, Lucas, the same of P. Gidica, Godt., and Tera- 
colus JoUna, Butl., the same of T. spcciosa (Wallengr.), as, in each 
case, the smaller form appears only in the dry season and the larger 
one only in the wet season. These latter cases can only be proved by 
careful breeding from the eggs of one or both forms ; at present, we 
have only the recorded dates of capture (and far too few of them) to 
go upon. When really systematic and extensive rearing of successive 
generations from the ova shall have been fully carried out and recorded 
by competent lepidopterists, it cannot be doubted that a great and 
most instructive rectification of our so-called " species " will ensue, 
not only in this Sub-Family, but throughout the Order. 
Genus PONTIA. 
Pontia (Fab., 1807, — part.), Boisd., Sp. Gen. Lep., i. p. 430 (1836). 
Pontia, Doiibl, Gen. Diurn. Lep., i. p. 40 (1847); Trim., Ehop. Afr. 
Aust., i. p. 25 (1862). 
Nychitona, Butl., Cist. Ent., i. p. 41 (1870); Moore, Lep. Ceylon, i. p. 117 
(1881). 
Leptosia (Hiibn., 1816, — part), Distant, Rhop. Malay., p. 287 (1882-86). 
Imago. — Head wide, clothed above and in front with rather rough 
short hair ; eyes large, smooth ; fcdpi short, acute, the tips far apart, 
— only terminal joint porrected, the others appressed to the face and 
clothed inferiorly with long hairs ; antennae of moderate length, rather 
thick, with a gradually-formed but well-marked fusiform club. 
Thorax very small and short, narrower than head, clothed with 
scales and short hairs ; prothorax forming a marked neck. Fore- 
wings elongate, with costa much arched, apex very rounded, and hind- 
margin convex ; costal nervure terminating at about two-thirds length 
of wing ; subcostal nervure three-branched, the first nervule emitted 
far (about one-third), the second a little before extremity of discoidal 
cell ; upper radial united to third subcostal nervule at some distance 
beyond, lower radial at extremity of cell ; lower disco-cellular nervule 
long, strongly curved inwardly, joining third median nervule at a pro- 
nounced angle ; discoidal cell rather broad, and three-fifths the length 
of wing ; submedian nervure curved downward near base. Hind-wings 
rather bluntly obovate ; costa very slightly curved beyond basal lobe ; 
apex somewhat pronounced ; hind-margin very convex ; anal angle 
rounded ; inner margin convex at base only, so that no channel or 
groove is formed beneath abdomen ; costal nervure ending on costa not 
far beyond middle ; subcostal nervules much curved, especially upper 
one, which is emitted a full third before extremity of discoidal cell ; 
upper disco-cellular extremely short (so that radial nervule appears 
almost to spring from second subcostal), lower one long, angulated, 
oblique ; discoidal cell about half length of wing ; internal nervure 
strongly bent downward, terminating at a little beyond middle. Legs 
