184 THE ENTOMOLOGIST. 



LIFE -HISTORY OF C0LIA8 ED USA. 

 By F. W. Frohawk, F.E.S. 

 (Concluded from Entom. xxv. p. 202.) 



Having previously published the descriptions of the eg^ and 

 young larva immediately after emergence from the ovum, I will 

 now proceed to describe C. edusa through all the remaining 

 stages. 



When eight days old, June 19th, 1892, the larva measured ^ of 

 an inch in length and was of a very pale creamy yellow-green colour. 

 On that day it crawled to another leaflet of clover and spun a little 

 layer of silk on the under surface and thereto fixed itself for 

 moulting for the first time, which took place on the 21st. 



The colour after first moult is of a dull smoky or grey- 

 green, the head dusky brown, both head and body being clothed 

 with very short fine hair or pubescence, only visible by the aid of 

 a lens, which also brings into view indications of a lateral 

 whitish stripe and a smoky leaden hue prevailing over the under 

 surface. Its first meal after moulting consists of the cast skin. 

 In feeding on the leaves it now perforates them, whereas, previous 

 to moulting, it fed only on the cuticle, leaving the internal fibres. 



On June 29th several larvse were in their second stage, 

 having only moulted once, but the majority were in the third 

 stage and were almost ready for the third moult. 



Before second moult the larva measures i of an inch ; colour 

 pale yellowish grey-green ; bead and body minutely sprinkled 

 with black dots, each emitting a tiny white hair ; the segmental 

 divisions are clearly discernible, and each segment is wrinkled 

 transversely; the ground colour of the head is brown; the anal 

 segment is slightly darker than the rest of the body. It rests in 

 a perfectly straight position along the midrib of the leaflet with 

 the head towards the base. After second moult and shortly 

 before the third it is f of an inch long ; the body is nearly cylin- 

 dical ; the colour is of a dull green approaching a smoky or grey- 

 green, produced by the numerous black warts and whitish hairs, 

 which also gives the surface a velvety texture, increased in 

 roughness by the deep transverse wrinkles ; a whitish lateral line 

 runs the entire length of the body ; the head is pale ochreous- 

 green, sprinkled with black warts and white hairs similar to the 

 body ; the under surface is dull green. Just before moulting the 

 colouring becomes paler and assumes a light bluish-green tint. 



One larva which hatched on 11th June, moulted the third 

 time on the morning of July 1st, and its fourth moult occurred 

 on the 4th of that month, feeding for only two days, as it fixed 

 for the fourth moult on the morning of the 3rd and changed its 

 skin the following day. 



After third moult, when twenty days old, it measures I of an 

 inch in length while resting; the colour is now light green 



