292 BRITISH BUTTERFLIES. 



behind, one a little higher in front, and a lower one a little behind 

 the middle one ; two fine hairs above the legs and an indication of a 

 hair a little above and in front of these, or of a hair and minute 

 lenticle. There is also a minute hair at the front margin of the 

 segment just outside i, and on the 1st, 2nd, 7th and 8th abdominal 

 segments a conspicuous lenticle at the front of the segment below the 

 spiracle. On the prothorax is a plate, with a trace of median suture 

 and four hairs and a lenticle on each side. The plate narrows to each 

 side, but the ends are truncate, not pointed. There are three hairs in 

 a row along the front outer margin of the plate, two more in front of 

 the spiracle, a small lenticle and hair below, and marginal hairs on the 

 leg. The mesothorax and metathorax are nearly like the abdominal 

 segments. The mesothorax has a small lenticle in front of tubercle i 

 + ii ; the front hair of the four flange hairs is well above the others, 

 so that the lateral flange hairs are only three ; the marginal hairs at 

 the base of the legs are two. Of surface sculpturing there appears 

 to be a darkish hollow below and behind i -f ii. The 7th, 

 8th, 9th, and 10th abdominal segments have a continuous lateral 

 flange, with no incisions, or at any rate difficult to determine, carrying 

 on each side ten hairs in an upper row, and five smaller ones in a 

 lower. The anal plate has four blackish marks but no hairs or 

 lenticles. The prolegs have the usual two pads each, with two 

 hooklets, and the central transparent projection with broad, truncate, 

 end. Second instar (April 6th): 3'5mm. long. Head black, shining, 

 half as wide as prothorax. Light green, with whitish-, or yellowish- 

 green dorsal lines and stripes. The dorsal stripes border the dorsal 

 level, which is very narrow on the 1st to 7th abdominal segments : 

 behind this the dorsal level flattens out into the posterior slopes of the 

 7th to 10th abdominal segments, which do not distinguish between 

 the dorsal level and slopes, but are one curved surface. Forwards, the 

 two yellow lines diverge on the thoracic segments, and pass on either side 

 of the prothoracic plate, and become lost before reaching the margin of 

 the segment. On the 1st to 6th abdominal segments the dorsal line runs 

 down the posterior border of the segments (i.e., the colour does), as well 

 as starting obliquely at the front of the segments, and running down- 

 wards and backwards, the two lines meeting at the posterior border of 

 segment, and ending in a darker area. Below, the oblique line is 

 continued on the following segment by a finer line, or as a rounded 

 patch. The lateral flange is pale. The prothoracic plate is green 

 (colour of rest of larva), but in some lights is polished and shining; 

 it seems to be without hairs. This is, however, hardly probable. 

 The hairs of the dorsum and flange are much more numerous, 

 those of the flange in a bright light making quite a haze round 

 the larva. April 10th : The larva much grown, nearly 6mm. 

 long, and colours much more distinct]y differentiated. On the 2nd, 

 3rd, 4th, 5th, and 6th abdominal segments, the dorsal level is 

 very narrow, and the two yellow lines bounding it are very close 

 together, i and ii are rather close together, and close to those of 

 opposite sides ; they are of a pale brownish; i about 0-7mm. long. On 

 the 7th to 10th abdominals the dorsal level rounds into slopes and the 

 yellow lines diverge a little, apparently failing on the 10th, where a 

 bright line, a little less dorsal, appears to be the same as the upper 

 oblique line of slope. On the 1st abdominal segment the two lines 



