LEIOCAMPA DIOMA. 159 



Mr. H. Doubleday gave it as his experience that not 

 one species could be properly called double-brooded, the 

 appearance of a few examples of a second flight being 

 accidental ; however, Boisduval says distinctly that 

 dictcea and dictceoides are double-brooded on the Con- 

 tinent, and Mr. Harwood, who has had great experience 

 in larva-rearing, prefers to call both these species 

 double-brooded in this country. I have never taken 

 dictcea myself, but in June, 1860, I had two batches of 

 eggs given me, the larvas from which hatched June 27th 

 and July 19th, and I bred the moths June 13th to 

 July 1st, 1861. In 1866 I bred a moth March 22nd, 

 but have not recorded any special circumstances that 

 might have caused this early emergence. In 1886 

 Mr. Gr. T. Porritt sent me some larvse September 16th 

 and 24th, all in their last skin and nearly full-fed, and 

 by the end of the month they had spun up. 



The full-grown larva is fully 40 mm. in length, and 

 has an elongated appearance ; the head is notched on 

 the crown, and is rather deeper than segment 2, with 

 rounded outline and very glossy ; the skin is like 

 shining leather ; on 3 a sort of fold, swollen laterally, 

 on 4 a smaller lateral swelling; on the back of each 

 segment 5 — 10 what may be called an attempt at a 

 transverse hump, those on 5 and 6 being smaller than 

 the rest ; on 12 a pyramidal hump extended laterally; 

 the anal flap looks granulated, the ventral prolegs 

 strong, the anal prolegs small ; in colour I had two 

 varieties ; one whose general tint was drab, with a 

 transverse' patch of warm brown on each segment 5 — 

 12, 13 altogether brown, on 3, and again on 6 — 10 a 

 purplish streak edging the hinder part of the brown 

 patch on either side, spiracles conspicuous, being 

 black with small white centres and with strong white 

 rings, the centre of the belly pale yellow, the head 

 delicately reticulated with a pattern of lilac, buff and 

 brown, the thoracic legs red, the ventral prolegs 

 brown with a purple stripe down them (before the 

 larva became full-fed the brown colouring had a red 



