HYDRELIA UNO ANA. 97 



The egg is soft-looking, rather irregularly shaped, 

 but still of the usual echinus-like outline, with nearly 

 forty very shallow and irregular ribs, connected by 

 irregular transverse reticulations, and in colour a full 

 yellow ; in fact, it looks like a little speck of butter. 



On June 29th the eggs became dark grey, and on 

 the 30th the larvse came forth ; by the 17th of July 

 they were about a third of an inch in length, by the 

 28th they were three-quarters of an inch, and by the 

 third week of August full-grown. 



They fed well on Gar ex sylvatica ; when at rest, 

 stretched out flat along the blades of their food ; 

 looping in walking, and jumping about angrily when 

 touched. 



The newly-hatched larva is a little greenish looper, 

 with the usual dots showing brown, and emitting 

 bristles. As it grows it becomes more and more of a 

 full green after every moult. When it is full-grown 

 the length is quite an inch, the figure slender, cylin- 

 drical, uniform throughout in bulk, save that the third 

 segment seems a trifle swollen, and the last three 

 segments taper slightly to the anal flap, which is 

 bluntly rounded off, or almost squared off; the head 

 is hard and globular, about as wide as the second 

 segment ; there are two pairs of ventral legs fully 

 developed and usable, and the rudiments of another 

 pair, useless. 



The colour is a full velvety-green, with a pulsating 

 dorsal vessel of a darker tint ; there is a fine whitish- 

 green subdorsal line, and a rather broader spiracular 

 line of very pale yellow ; the spiracles are indistinctly 

 brownish, and the hinder segments paler than the rest 

 of the back ; the belly is also paler, but still of a soft 

 rich green ; the head somewhat yellowish-green. 



The larvae retired under ground for pupation. 

 (John Hellins, December 14th, 1869; E.M.M., March, 

 1870, VI, 232.) 



VOL. VI. 



