166 THE ENTOMOLOGIST. 



Dorsal view : The head is obtuse, from the base to raiddle of 

 wing the outhne is straight, then swelling to second and third 

 abdominal segments ; abdomen attenuated to the rounded anal 

 segment. Side view : The head rounded, with slight swellings 

 at base of antennae ; thorax convex ; division between first and 

 second segments forming an obtuse angle ; abdomen slightly 

 swollen and curving to rounded anal segment ; ventral surface 

 forms almost a straight line, in which respect it mainly differs 

 from L. arion pupa. The cremastral hooks number in all twenty- 

 four, and are placed in two distinct patches of twelve each. 



The entire surface (like arion) is covered with very fine 

 brown reticulations, and, excepting the wing, is sprinkled also 

 with minute circular discs; these are especially numerous on the 

 head and prothorax ; also sprinkled over the surface are finely 

 serrated whitish bristles. On each side of the prothorax is a 

 small patch of bristles with their ends finely ciliated. The 

 dorsal gland of the larva is modified into a slight suture, marked 

 in the centre by a brown spot. 



When first pupated it is a clear transparent green, showing 

 the nervures of both the primaries and secondaries and the 

 general internal structure ; it gradually assumes an ochreous 

 tinge at both ends, and the darker dorsal line (dorsal vessel) can 

 be seen pulsating as in the larva. 



When four days old it is mostly of a dull ochreous green ; 

 thorax whitish green ; head and anal segment pale pinkish buff; 

 neuration of both wings still showing. 



When nine days old and normal the colour is a pale ochreous 

 green ; wings palest, inclining to whitish ; head, prothorax, and 

 anal extremity tinged with rust-red, caused by the density of the 

 reticulations and discs ; spiracles whitish ; nervures still showing 

 under the thin pupal skin. 



On the twelfth day the maturing of the imago commences by 

 the eyes becoming a pale reddish drab and the wings opaque 

 cream-colour; the eyes daily deepen, and wings become paler 

 and more opaque. On the fifteenth day the eyes are dark 

 brown ; wings, thorax, and head light tawny buff ; abdomen 

 greenish ochreous. On the following day the whole colouring is 

 quickly transformed into black, blue, and grey. In the males 

 the wings are then rich deep metallic-blue at the base, blending 

 into light greenish blue, forming the median area ; the rest of 

 the wing black, and black nervures crossing the blue ; outer 

 border creamy white ; the eyes, thorax, and dorsal half of 

 abdomen steel-black ; ventral surface olive. A few hours before 

 emerging the blue of the wings assume a silvery grey, and all 

 the hair-scales of the body show clearly through the thin delicate 

 texture of the pupal skin, giving the whole a silvery-grey 

 appearance. 



The pupa is attached to the food-plant by the cremastral 



