148 LLOYD'S NATURAL HISTORY. 



succession of broods throughout the year. The pupa is greenish, 

 spotted with black. 



HOWARD'S WHITE BUTTERFLY. PIERIS METRA. 



(Plate LI II. Figs. 2, 3.) 



Pontia metra, Stephens, 111. Brit. Ent. Haust. i. p. 19 (1827). 

 Pieris metra, Westwood, Brit. Butterflies, p. 26, pi. 5, figs. 5, 6 

 (1841). 



This insect is found in April and June, and is considered to 

 be undoubtedly a mere var.'ety of P. rapa, as the pupa does not 

 differ. 



The wings are white or cream-colour, the fore-wings being 

 much pointed at the tip, with the base black, and the tip more 

 or less clouded with dusky. The male has one black spot on 

 the fore-wings above, and the female two ; but these are fre- 

 quently more or less obsolete. The hind-wings are white, with 

 the base black, and a dusky spot towards the end of the costa. 

 On the under side the tip of the fore-wings is yellow ; the base 

 is blackish, and there are two obsolete spots on the disc ; the 

 hind-wings are rather bright yellow, thickly dusted with blackish, 

 and there is a pale orange streak at the base of the costa ; the 

 fringes are white. 



THE GREEN-VEINED WHITE BUTTERFLY. PIERIS NAPI. 



(Plate LI V. Figs, i, 2.) 

 Papilio napi) Linn. Syst. Nat. (ed. x.) i. p. 468, no. 60 (1758) ; 



id. Faun. Suec. p. 271 (1761); Esper, Schmett. i. (i) p. 



57, pi. 3, fig, 3 (1777); Hiibner, Eur. Schmett. i. figs. 



406, 407 (1803?). 

 Pieris napi, Godart, Enc. Meth. ix. p. 161, no. 145 (1819); 



Boisd. Spec. Gen. Lepid. i. p. 518 (1836); Newman, Brit. 



Butterflies, p. 160 (1881) ; Kirby, Eur. Butterflies and 



Moths, p. 7, pi. 4. fig. 5 (1878); Lang, Butterflies Eur. 



p. 3 1 * P 1 - 7, fig. i, pi. 15, fig. 3 (1881); Barrett, Lepid. 



Brit. Isl. i. p. 24, pi. 3 (1892); Buckler, Larvae of Brit. 



