LEIOOAMPA DICT2EOIDES. 161 



June 29th, Mr. 0. Gr. Barrett sent me eggs ; the 

 larvae hatched July 4th, moulted July 20th, but died 

 soon after. On September 10th Mr. W. H. B. 

 Fletcher sent me some larvae, mostly full-fed, but I 

 could not persuade them to become pupa3. September 

 18th Mr. F. N. Pierce, of Liverpool, sent me some 

 larvae. The food is birch, though I noticed one larva 

 which came to me feeding on sycamore ; the egg is of 

 a flat button shape, about 1*2 mm. wide and 05 mm. 

 high, the upper surface most minutely granulated, 

 with a small smooth spot on the top, in colour dead 

 greenish-white ; the flat under surface smooth, shining, 

 in colour full green. The newly hatched larva is just 

 2*5 mm. long, with a large jet-black head, a narrow jet- 

 black collar on 2, a slight dorsal hump on 12, colour 

 translucent white, with an internal blue-green tinge in 

 front, and a patch of yellow-green on 11 and 12, usual 

 dots small and black, each with a short black hair. In four 

 or five days time the head has become shining brown, the 

 back and belly pale purple, the sides pale yellow, the 

 tip of the hump on 12 black. At first the larva eats the 

 under surface of a birch leaf, but before the first moult 

 eats holes through its substance. When 20 mm. long 

 the larva is reddish- claret on the back, with a dull olive 

 tint on the middle of each segment, the hump on 12 

 deep purple, the spiracular stripe pale yellow ; on seg- 

 ments 2 and 3 the warts enlarged transversely, so as 

 to give the effect of a fold ; on 12 a large fleshy tail-like 

 hump pointing backwards. The full-grown larva is 35 

 mm. in length, with the figure slender, the shining head 

 larger than 2, flat in front, but with rounded sides, the 

 skin very glossy and leathery looking, very smooth on 

 the back, wrinkled at the sides ; on 2 and 3 a sort of 

 dorsal fold, on 12 a dumpy transverse hump with a 

 round central prominence, the anal flap roughly sha- 

 greened ; in colour the back is lilac varied with dull 

 olive, a red tinge on the sides, the fold on 3 deep 

 purple, the hump on 12 black with a black streak on 

 each side running down to the spiracular line ; the 



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