PIERINiE. 7 



Boisd., P. Ahi/ssinica, Lucas, the same of F. Gidica, Godt., and Tera- 

 colus Johina, Butl., the same of T. speciosa (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. 



Po7itia (Fab., 1S07, — part.), Boisd., Sp. Gen. Lep., i. p. 430 (1836). 

 Pontia, Doubl., Gen, Diurii. Lep., i. p. 40 (1847); Trim., Rhop. Afr. 



Aust., i. p. 25 (1862). 

 Nijchitona, J^\xi\., Cist. Ent., i. p. 41 (1870); Moore, Lep. Ceylon, i. p. 117 



(1881). 

 Lepiosia (Hiibn., 1S16,— part), Distant, Rhop. Malay., p. 287 (1882-86). 



Imago. — IFead wide, clothed above and in front with rather rough 

 short hair ; eyes large, smooth ; 2?ft^^^* short, acute, the tij)s far apart, 

 — only terminal joint porrected, the others appressed to the face and 

 clothed inferiorly with long hairs ; antennm 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 ; prothoras 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. Rind-^uings 

 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 



