EDWARDSIA W- ALBUM. 165 



point stretching out in front, it has a whitLli (almost silvery) aspect, 

 and looks as if it were a thin scale of something that could be easily 

 picked off. There are two longitudinal black lines on the posterior 

 projection, and, in the centre of each lateral wing, there is a small black 

 circle, which is, no doubt, a lenticle ; nothing else in the way of 

 lenticles or of primary tubercles is to be detected. About one-fourth 

 from the posterior margin of the 7th abdominal segment is, dorsally, a 

 transverse line of full width of dorsal level ; this has the appearance of 

 being a gland. Head : When feeding, this appears to be black, owing 

 to lower margin of clypeus and eye-region being of that colour ; the 

 jaws are dark brown; the labrum and first antennal joint nearly white, 

 the rest of head, when exserted, is pale ochreous, the upper part of clypeus 

 nearly white, but when fully stretched forth the back part is seen to be 

 dully green. True legs : Terminal joint slightly ochreous, the claw 

 darker, the rest green . Prolegs : These possess a large inner pad, divided 

 into anterior and posterior portions, each of which projects, with 

 a rounded margin, but which are just continuous and not two 

 separate things. Round the inner margin of these, forming two 

 semicircles in certain positions, there run what appear to be three 

 rows of hooks, or crochets, the first, or inner row, all but obsolete, 

 so that one at first does not realise that they are actually the inner 

 ends or bases of the crochets of next row ; the next two rows appear to be 

 parallel and well-developed, and consist of thirteen or fourteen crochets 

 in each portion. Really, these are all in one row, but of two different 

 lengths, with considerable regularity in the alternation of the hooks of 

 different sizes, and numbering some 26 or 28 hooks to each pad. In 

 the angle between the two portions of the pad, and just outside, is a pale 

 white extensile element, without any crochets of any sort. Towards the 

 posterior edge of the dorsum of the 8th abdominal segment, and on the 

 edge of the continued ridge, are two tiny depressed points, almost of the 

 ground colour, hence most difficult to see. These seem to mark the seat 

 of the eversible glands, but whether obsolete or functional I am quite 

 unable to say, as they are never seen to be in action (Tutt, June 10th, 

 1905). Fullc/rown in final instar: (1) In many respects, like the larva 

 of Strymon pruni, especially in the sharpness of each segmental element 

 of the dorsal ridge, in the pronounced oblique lines, and in general 

 form and outline. With a length of 15mm. it is 5mm. wide and 

 4mm. deep. The mesothorax overhangs the prothorax. The 1st, 2nd, 

 3rd, 4th, and 5th abdominal segments have the acuminate points of 

 dorsal ridge ; the metathorax and 6th abdominal are lower and rounder, 

 but still belong to this series. The width between the flanges is about 

 lmm., and the slope is 3mm. The slope is quite flat in a plump larva, 

 still feeding, but nearly finished ; in one larva, having finished feeding 

 and searching for a place for pupation, it is actually concave. As to 

 colour, one specimen was almost entirely green, but now it is looking 

 out for pupation the green has become a dingy grey-olive, and the 

 other colours and markings stand out strongly, though previously 

 hardly visible. The ridges are hardly marked on mesothorax, but 

 thence to the 7th abdominal are equidistant and parallel (not wide in 

 front like betulae). Between them, in this specimen, is dark olive- 

 brown, the actual ridge yellow (converging at front of each segment) ; 

 the oblique lines (faded yellow) proceed as in pruni, viz., posterior 

 portion of dorsal ridge, the lower side of triangle on segment behind, 



