PI KRIS] PIERIDAE 353 



1. Hindwiiigs beneath dull greenisli, white-spotted 



1. dajMdice. 

 ,, ,, not spotted . . .2. 



2. Veins of hindwings beneath edged with dark shading 



2. na2n. 

 „ ,, not dark-shaded . . 3. 



3. Apical blotch of forewings reaching middle of termen 



4. hrassicae. 

 ,, „ „ not reaching middle of 



termen . 3. rajme. 



1. P. daplidice, L. 37-48 mm. Forewings creamy-white, 

 towards base black- sprinkled ; a black discal spot, and some- 

 times a subdorsal posterior spot ; an apical black blotch, reach- 

 ing middle of termen, containing a series of four white spots. 

 Hindwings creamy-white, towards base black-sprinkled ; in ^ 

 confluent subterminal and terminal series of blackish spots. 

 Hindwings and apical blotch of forewings beneath pale dull 

 greenish, black-sprinkled, with series of white spots. 



S. England to Worcester and Cambridge, an occasional 

 immigrant only ; Europe, N. and WC. Asia, Japan, N. Africa ; 

 8. Larva bluish-grey, with numerous black spots and dots ; 

 subdorsal and spiracular lines deep yellowish or partly whitish; 

 head yellowish, black-dotted : on Reseda and various Crwci ferae ; 

 6,7. 



2. P. napi, L. 37-48 mm. Forewings creamy-white, towards 

 base irrorated with black ; an apical blackish blotch, sometimes 

 broken into several terminal spots ; a black spot between 3 and 

 4, in $ sometimes absent ; in $ a black subdorsal posterior spot, 

 and dorsal confluent mark. Hindwings creamy-white, base 

 black-sprinkled ; a black costal spot before apex, in $ sometimes 

 absent. Hindwings and apex of forewings beneath pale yellow ; 

 veins edged with a shading of fine black lines, in hindwings 

 more broadly. 



Britain to Ross, Ireland, common ; Europe, N. and WC. 

 Asia, N. America ; 5-8. Larva green, irrorated with black ; 

 spiracular line pale, marked with yellow spots enclosing black 

 spiracles : on Nasturtium, Barharea, Brassica, etc. ; 7, 9, 10. 

 The male can emit a perfume resembling lemon-scented mint. 



3. P. rapae, L. 46-54 mm. Differs from P. napi as follows : 

 forewings with apical blotch entire, not reaching middle of 

 tei-men, wings beneath without black shading along veins, hind- 

 wings beneath finely sprinkled with black. 



Britain to the Shetlands, Ireland, very common ; Europe, 

 2 a 



