86 BRITISH BUTTERFLIES. 



Tli 3 male is distinguished from the female by having 

 only one round black spot, or sometimes none, on each 

 upper wing, whilst the female is spotted as in the 

 engraving. The under side of the hind wings is dull 

 yellow, lightly powdered with black scales. 



The butterfly is seen during nearly the whole of the 

 summer, and is found almost everywhere. 



THE GREEN- VEINED WHITE BUTTERFLY. 

 (Pieris Napi.) (Plate IV. fig. 4.) 



Is so called from the greenish tint that often borders 

 the veins or nervures on the under side of the hind 

 wing ; but the name is not always an appropriate one, 

 for a large proportion of the specimens met with have 

 the veinings grey, and not at all green ; but the fact is, 

 that the ground colour varies greatly, from creamy 

 white to full buff, or bright clear yellow ; in the latter 

 case it is, that the minute black scales which border the 

 course of the nervures, covering over the yellow, pro- 

 duce a grey-green effect on the eye. 



The size also is very variable. I have a specimen 

 ihat expands two inches and two lines across, from tip 

 fco tip, and have seen another not larger than a small 

 butterfly little more than one inch from tip 



