PIERIS. 



447 



Genus PIERIS. 



Pieris, Boisduval, Sp. Gen. i. p. 434 (1830); Doubleday, Gen. Diurn. Lcp. i. p. 1,2 

 (1847). 



" Hkad rather small, hairy. 



" Erjes round, moderately prominent. 



" Labial palpi longer than the head ; the first joint generally much longer than the second, 

 both stout, more or less cylindric, especially the first, clothed anteriorly with long hairs ; 

 third joint cylindric, slender, rather pointed, mostly as long as, or longer than, the second, 

 clothed with short appressed scales, and a few hairs in front at the base. 



" Anttnme of moderate length, with a short obconic club, generally compressed. 

 " Thokax moderately stout, clothed with long delicate hairs. 



" Anterior wings more or less triangular, sometimes elongate, slightly falcate, or rounded 

 exterually. Subcostal nervure three-, or four-branched. Upper discoidal nervure united 

 to the subcostal for some distance beyond the cell. Lower discocellular rather long, 

 curved inwards. 



" Posterior wings obovate, sometimes rather elongate, with the base slightly produced anteriorly ; 

 sometimes more rounded. Discoidal nervule becoming a third median nervule. Inner 

 margin forming a very distinct channel for the recei^tion of the abdomen. 



" Legs moderately strong. Claws deeply bifid. Paronychia not quite equal to them in length, 

 broad, subtriangular. Pulvillus as long as the claws, jointed, 



" Abdomen rather slender, not extending to the end of the wings, 



" Laeva subcylindric, with the head small, rounded ; more or less clothed with hair. 



" Pi(2M angular, pointed anteriorly, not arched, sometimes tuberculate ; abdominal segments 

 tapering to a point," {Doubleclag, I. c.) 



Pieris iiapi. (Plate XLIII. figs, l c? , 2 ? .) 



Papilio napi, Linnaeus, Syst. Nat. i. 2, p. 760 (1767). 

 Pieris napi, Lang, Butt. Eur. p. 31, pi. vii. fig. 1 (1884). 



" Expands l-oO to 1*87 in. "Wings white, with the bases dusky. The nervures are distinct and 

 black. The fore wings have the tips, and sometimes tlie ends of the nervures, dusky. Male 

 sometimes with, but often without, a small black spot midway between the centre and the 

 hind margin. Pemale with two black spots, as in P. rapve. Hind wings with a black 

 spot on the costa. The female is usually larger than the male, and is always darker, having 

 blackish scales running along the course of the nervures. Underside : fore wings white, 

 tipped with greenish yellow, with nervures conspicuous, and with two black spots, as in the 

 allied species. Hind wings pale yellow, with dark scales placed thickly along the course of 

 the nervures, giving the appeai'ance of green veins. 



" Larva green, brighter on the sides than on the back; the spiracles are marked with red and 

 yellow. Feeds on various kinds of Cruciferce and liesedacece from June to September. It 

 hibernates as a pupa, which is greyish or greenish yellow, speckled with black." 

 {Lang, I. c.) 



