PRIONERIS. 171 



about two inches across the wings. The fore-wings are black- 

 ish, with some sub-apical white spots, most distinctly seen be- 

 neath, where they are tinged with yellow, and the hind-wings 

 are white above, with a black border, and yellow below, with a 

 narrow and incomplete black border, spotted with yellow. 



GENUS PRIONERIS. 



Prionerls^ Wallace, Trans. Ent. Soc. Lond. (3) iv. p. 383 (1867); 

 Butler, Cist. Ent. i. pp. 33, 39 (1870); Schatz, Exot. 

 Schmett. ii. p. 64 (1886). 



The Butterflies of this genus resemble Delias^ but the sub- 

 costal nervure is four-branched, with the two first nervules 

 emitted before the end of the cell. The wings are generally 

 more pointed than in Delias^ and the costa is strongly serrated 

 in the males. Apart from other differences, Frio?ieris may be 

 distinguished from Appias by the absence of an anal tuft. 



The species are large and conspicuous, though not numerous, 

 and are confined to India and the Indo-Malayan Islands. The 

 type is, 



PRIONERIS THESTYLIS. 



Pieris thestylis^ Doubleday, in Gray, Zool. Misc. p. 76 (1842); 



id. Gen. Diurn. Lepid. pi. 6, fig. 2 (1847). 

 Prioneris thestylis^ Wallace, Trans. Ent. Soc. Lond. (3) iv. p. 



194, no. I (1867); Staudinger, Exot. Schmett. i. p. 35, 



pi. 20 (1884). 



Female. 



Pieris sefa^ Moore, Cat. Lepid. Ins. Mus. E. I. Co. i. p. 78 

 (1857); id. Proc. Zool. Soc. Lond. 1857, p. 102, pi. 44, 

 fig- 3- 

 A large and handsome Butterfly, with rather pointed wings, 



expanding from three to four inches ; it inhabits North India. 



