30 LErlDOPTERA. 



arvensis, Hespcris mntroiialis, Erysimum aUiari'i, Tarritis 

 glahra, and other cruciferous plants, feeding in preference 

 upon the seed pods. June to August. 



Pupa very curious, long and slender and sharply pointed 

 at both ends, but with the tips of the wing-cases and adjacent 

 ventral portion forming an obtuse projecting angle, whicli 

 fits well to the under side of the insertion of a side shoot of 

 the food plant, so that it is hardly distinguishable from a 

 tliickening of the stem. 



Indeed this species exhibits a series of curious adaptations 

 to its surroundings, the larva being so like a seed-vessel as 

 almost to defy detection, the white line down its sides 

 actually simulating the line of light down the side of the 

 glossy seed-vessel, and the butterfly, when in repose, with 

 closed wings, on the tip of a flower spike of Cai-damiiic 

 pratensis — a favourite resort — seems at first sight a mere con- 

 tinuation to the bunch of buds ; while its accurate adaptation 

 to the leaf of one of the smaller UmhcUifcnc,u\)on which also 

 it commonly rests, is notorious. Such accurate mimicry in 

 three stages of the life of the same insect is truly marvellous. 



Generally distributed in England, Wales, and Ireland, and 

 found in Scotland as far north as Moray on the east and the 

 Clyde district on tlie west. 



Genus 1. LEUCOPHASIA. 



Antennre short, slender, with broad clubs. Wings wliite. 

 Fore wings narrow at the base, rounded at the apex. 

 Abdomen long and slender. 



Lakva downy, rather fusiform. 



Pupa elongated, sharply pointed. 



1. L. sinapis, L. — Expanse, H to If inch; weak, 

 slender, wings white, narrow, tipped with blackish, grey 

 beneath. 



