14 THE ENTOMOLOGIST'S RECORD. 



the posterior margin to a spot midway between the thoracic plate and 

 the head. The lowest group starts immediately below the spiracle, 

 and consists of seven large and several small tubercles. Another group 

 of six very small tubercles is parallel to the anterior margin of the 

 thoracic plate, and between these two groups we find the third group 

 consisting of about six larger tubercles. Each of these groups is 

 thus arranged, fairly regularly, in the form of an arc. The spiracle is 

 large and rather flat compared with those of the abdominal segments. 

 The thoracic plate is small, and contains eight tubercles, situated 

 around the margin, and two lenticles towards the centre. The rear 

 abdominal segments are considerably modified. On the 7th and 8th, 

 the spiracles are more dorsal than on the preceding segments, and 

 slightly larger. Dorsally, the 7th abdominal contains only two 

 tubercles, situated on a slight elevation arising out of a depression; the 

 whole is bordered by a circle of small tubercles, together with several 

 lenticles, giving an impression very similar to that produced by an 

 anal plate. On the 8th abdominal but one pair of dorsal tubercles is 

 represented, and the dorsal area of the 9th is occupied by two tubercles 

 placed one behind the other. The lateral areas of all these segments 

 contain several tubercles and lenticles irregularly placed. On the 8th 

 abdominal, posterior and ventral to the spiracle, is a slightly raised, 

 round, whitish patch, presumably the commencement of a gland. The 

 prolegs appear to bear two anterior and two posterior booklets, separated 

 into two groups by a pad. Duration of instar = thirteen days. 



Third instar. — Length, when fairly advanced in this stage 5mm., 

 increasing later to 7mm. Shape, Lycamid. The ground colour is 

 light olive-green, with reddish-brown dorsal stripe and subspiracular 

 flange, the outer margin of which is an almost pure white. The lateral 

 area is occupied by three stripes of a slightly lighter colour than the 

 dorsal stripe. Stripes 1 and 2 are practically similar to those of 

 the previous instar, stripe 1 being parallel to the dorsal line, and 

 stripe 2 inclining somewhat from front to rear. Stripe 3 is parallel 

 to the second stripe, the angle being such that it seems to be the 

 continuation of stripe 2 of the previous segment. The colour of the 

 lateral flange extends upwards to meet this last stripe at both margins of 

 the segment, leaving only a white patch around the spiracle free. On 

 the 7th abdominal segment, the dorsal stripe is widened out to a 

 diamond- shaped patch, reproduced in miniature on the remaining 

 posterior segments. On these rear segments the lateral stripes are not 

 so well marked, tending to suftuse. The prothorax shows traces of 

 lateral markings, but, in general, displays more ground colour than any 

 of the other segments. The subspiracular flange does not appear quite 

 so prominent at this stage, owing to the filling out of the lateral 

 portions. Viewed from the side, the marginal flange is now distinctly 

 visible, presenting a series of well-rounded curves. The prothorax is 

 broad, rounded, and overhanging, sloping upwards from front to 

 rear, from which latter margin the mesothorax rises almost 

 perpendicularly to the dorsal plane. The rear segments are very flat 

 and sloping, showing no traces of dorsal ridges, and terminating in the 

 continuation of the spiracular flange, which forms a species of rim 

 around the hinder margin of the 9th abdominal segment. The spiracles 

 are much larger and well distinguishable from any lenticles, being 

 situated on a slightly raised white patch. The general surface of the 



