PIEBI]SrjE. 187 



concave near tlie base. Hindwing bi'oadly oval ; exterior margin uneven ; basal 

 area from the subcostal to internal vein veiy hairy ; precostal vein curved ; costal 

 vein arched ; first subcostal emitted at one-half before end of the cell ; discocellulars 

 very long and outwardly oblique, upper slightly concave, radial from their angle ; 

 cell extending to two-thirds length of the wing ; middle median at nearly one-fourth 

 and lower at one-half before end of the cell; submedian vein straight, internal 

 T'ecurved. Body stout ; abdomen compactly scaled above, finely hairy basally, 

 beneath finely hairy from base to claspers; thorax and head hairy; palpi long, 

 very laxly hairy beneath ; legs long ; antennge long, with a gradually thickened 

 club. 



Type.— P. Thestyhs. 



Mimicry. — Mr. A. R. "Wallace writes, " The species of Prioneris, in several cases, 

 seem to mimic those of the genus Tlnjca. The male of P. Thestylis, on the underside 

 most strikingly imitates Thyca Belladonna, while the female resembles it on the 

 upperside as well. P. Sita is a perfect representation of T. Eucharis. The species of 

 Thyca are very abundant and are weak, slow-flying insects, while the species of 

 Prioneris that mimic them are i^are, and the pairs which resemble each other inhabit 

 the same district " {I.e. 383). Mr. L. de Niceville says that the P. Sita of Ceylon 

 " is a splendid mimic in both sexes, of the highly protected Delias Eucharis, but its 

 more rapid and somewhat darting flight makes it easily distinguishable when on the 

 wing" (Journ. As. Soc. Bengal, 1899, 210). 



The species of this genus, according to the examinations made by Mr. J. "Watson 

 (I c. 1867, 259) do not possess androconial scales. 



PRIONERIS THESTYLIS. 



Wef-season form (Plate 538, fig. 1, la, S, lb, c, d, e, ? ; 539, 1, la, 9 ). 

 Pieris Thestylis, Doubleday, Gray's Zool. Misc. p. 76, ^ (1842); id. God. D. Lep. i p. 44, pi. 6, 



fig. 2, cJ (1847). Moore, Catal. Lep. Mus. E. I. Company, i. p. 78 (1857); id. Proc. Zool. Soc. 



Lond. 1865, p. 759. 

 Prioneris Thestylis, Wallace, Trans. Ent. Soc. Lond. 1867, p. 384, J $. Butler, Cistula Entom. i. 



p. 39 (1870) ; id. Proc. Zool. Soc. 1872, p. 27. Staudinger and Shatz, Exot, Sehmett. ii. p. 64, 



pi. 6 (1886). Ehves, Trans. Ent. Soc. Lond. 1888, p. 410, S ? • Swinhoe, id. I.e. 1893, p. 310 



de Niceville, Sikkim Gaz. 1894, p. 166. Kirby, Allen's Nat. Libr. Butt. ii. p. 171 (1896). 



Adamson, List Burm. Butt. p. 41 (1897). Watson, Jouvd. Bombay Nat. Hist. Soc. 1697, p. 669. 



Frubstorfer, Berl. Ent. Zeit. 1899, p. 107. 

 Pieris Seta, Moore, Catal. Lep. Mus. E. I. Company, i. p. 78, ? (1857) ; id. Proc. Zool. Soc. Lond. 



1857, p. 102, pi. 44, fig. 3, ? . Fmhstorfer, I.e. p. 108 (1899). 



Imago. — Male. Upperside greyish-white. Forewing with the median vein and 

 its branches basally black-lined ; the costal border black, the black curving obliquely 

 outward across end of the cell, thence broadly bordering the outer veins to the 



B b 2 



