446 BRITISH BUTTERFLIES. 



larva. No lenticles clearly made out. Sanre larva (September 11th, 

 1906) : Since August 15th, the larva has been moving occasionally, but 

 never eating ; it has got very much darker, quite red-brown, but with an 

 underlying green discoverable ; length 4 , 5mm. ; one sees no white points 

 (trumpet-hairs), but the larva was not killed and mounted ; it has spun a 

 pad of silk, to which it returns after wandering for a day or two, at least, 

 it has twice done so, and is on the pad now. This is, no doubt, the most 

 suitable place for hybernating. within its reach, but does not please 

 it ; it is on the lid of a tin box (Chapman). Final (? Fourth) instar 

 (June 9th, 1906) : The smallest larva in this instar is ll*5mm. long, 

 3 # 4mm. wide at 1st abdominal, and nearly 3mm., high, of which 1mm. is 

 below the lateral flange. The head is green, faintly tinted with ochreous; 

 eye-spots very black, and jaw and margin of labruin brown; the colour 

 of the body is a fresh bright green, modified by the transparency of the 

 tissues, and the surface-covering of white points and ochreous (hardly 

 brownish) hairs. The white points are about 30, and the hairs about 50, 

 to a square millimetre of surface on the dorsum ; the hairs are tinted 

 brownish-ochreous, darker at their extremities, and rough rather than 

 spiculated, about 0-3mm. on the lateral flange where they are long, 

 on the dorsum, not half that length. The white points are approximately 

 globes, attached to the skin by a small portion of their surface (no 

 pedicel), and with a roughened (hardly spiculated) surface — or perhaps 

 an extremely minute spiculation. They remind one a good deal of 

 the ova of Micropteryx. The skin-surface is closely set with very 

 minute raised (uncoloured) points. The dorsal ridges are represented 

 by a few longer hairs on the posterior margins of the segments. The 

 prothorax carries a plate, which is very long from back to front, and 

 extremely narrow, widest in middle, going to a point at front and rear ; 

 it is about 1mm. long, 0'6mm. wide, faintly ochreous, with a median 

 green suture; the posterior branches carry several lenticles. Lenticles 

 also occur elsewhere, but very sparsely, except on the dorsum of each 

 segment, in the neighbourhood of a depression that is mediodorsal, 

 and part of a subsegmental incision dividing the segments into a rather 

 smaller front and large back subsegment. The lenticles become more 

 numerous posteriorly, and the 9th and 10th abdominal segments (anal 

 plate?) are well supplied with them. The prolegs have the usual central 

 white extensile pad and two hcok-bearing pads ; each of these carries 13 

 to 20 hooks, in two rows, so far irregularly placed that even a third or 

 fourth row might be imagined; there are also 14 or 15 small hooks on 

 outside margin. The anal claspers have the same structure, with 35 hooks 

 on forward outer pad, 20 to 25 on posterior inner. The teeth of the jaws 

 are very long and sharp. The true legs are green, except last joint which is 

 tinted, and claw dark. The undersurf ace is pale (white or colourless) , except 

 that the deeper-lying green shines through, and plicated, and covered with 

 white points and hairs as freely as the uppersurface. This larva carries its 

 width from mesothorax, with very little narrowing, to the 7th abdominal 

 segment, and in so far is less slug-like than the nicely tapering full- 

 grown larva. The prothorax has the plate in a pit, which, owing to its 

 diamond-shape, gives a deep longitudinal sulcus, and, from the outer 

 angles, a sulcus, reaching outward and backward to above the spiracle, 

 marks out a swollen lappet on each side of the plate ; a less marked 

 sulcus reaches forward from the spiracle ; this one is continuous with 

 the upper sulcus, marking oft' the lateral flange from the " slope," and 



