GEO ME TRID^—PSE L'J)0 TERPNA. 279 



extremely faint transverse grey-green line, and beyond it an 

 obscurely white transverse stripe ; cilia pale green, tipped 

 with white. Female decidedly stouter, but with hardly a 

 trace of the dorsal tufts on the abdomen ; antennas simple; 

 the transverse lines of the fore and hind wings usually more 

 distinct ; otherwise similar. 



Undersides of all the wings dull pale bluish-green, shaded 

 to beyond the middle with a faint tinge of brown, rather 

 more so along the costa of the fore wings ; discal spot and 

 second line of these wings and the central line of the hind 

 just visible. Body and legs dull pale green. 



Rather variable in the depth of colour, more so in the dis- 

 tinctness of markings, in some female specimens even the 

 white subterminal line becoming conspicuous ; but the fugitive 

 nature of the colour in this species renders it difficult to dis- 

 tinguish between variation and fading. Freshly emerged 

 specimens are sometimes of a very bright, in other instances 

 of a curiously &/?ic- green. Fading seems to be caused very 

 rapidly, during life, by exposure either to damp or sunshine, 

 and captured specimens are rarely well coloured except when 

 fresh from the pupa. When preserved it must be kept 

 extremely dry. but in spite of all precautions the green 

 colour usually begins soon to fade out in the base of the 

 wings, and the discoloration soon spreads to the thorax, 

 more slowly to the remainder of the wings, which gradually 

 become yellowish-white or even very pale buff. The series 

 in a collection therefore requires renewal, if possible, every 

 few years. 



On the wing in June and July, but in rare instances single 

 individuals of a second generation may be found at the end 

 of August or beginning of September. 



Larva stout ; attenuated in front ; anal segment prolonged 

 into two shore points ; head squared, deeply bifid, dark green ; 

 second segment also divided, having four vertical dark green 

 raised points ; general colour dark green ; dorsal line incon- 



