292 BRITISH BUTTERFLIES. 



back (dorsal flanges), and down each margin (lateral flanges), with a 

 lower set down the middle of the slope ; the eversible organs of the 

 8th abdominal segment appear as small white circles. By April 27th, 

 1908, it is of an uniform green colour, hardly interfered with by the 

 subdorsal lines, the oblique stripes of a faintly lighter tone, and the 

 black points of hair-bases ; it is very flat, and perhaps looks flatter 

 than it is ; it has a marginal flange, and convex upper and under 

 surfaces ; its width is 2mm., which it carries nearly from end to end ; 

 its greatest height is 2mm., but this falls away very much on the 7 th- 

 10th abdominal segments. In the fourth (penultimate) instar, the 

 hairs are relatively smaller, rather than larger, still many are 0'5mm. 

 to 0-6mm. long, somewhat curved, thick ; the spicules numerous, and 

 regularly distributed. The coronal spicules on the bases are decided 

 and acute, but so small that the half dozen or so round a base are well 

 separated from each other. On the pro thoracic plate are ten to 

 fourteen hairs and lenticles, irregularl}- placed ; each is surrounded by 

 a row of beads, which are apparently skin-points, so to speak appro- 

 priated by the hair or lenticle, so that they look part of the base in 

 some cases, almost separate skin-points in others ; they, and the 

 hair-bases and lenticles, are very dark ; the plate which was hitherto 

 dark is nearly colourless, except near the centre posteriorly, so that 

 the little beaded circles stand out conspicuously. Except on the prothor- 

 acic plate, the skin-points are very transparent, and apparently of soft 

 consistence. The honey-gland has a flight of lenticles, and also some 

 short, thick, clubbed, and finely and closely spiculated, hairs, not seen 

 in previous skins. The fans (collapsed of course) are very distinct. The 

 pads of prolegs carry five or six hooks, of which two are long, the 

 others variously shorter. One larva has both pads of one clasper 

 with five hooks, the other has six on both. Final instar: 10mm. 

 long, height 2-2mm., width 3'6mm. ; of a pale green colour, with 

 lighter lines along the dorsal flange, three lateral oblique lines, the 

 lowest through spiracles faint, and a rather more evident lateral flange- 

 line. On lateral view the segments are a little rounded, but less than 

 in many larvae, and with no approach to a humped or serrated outline. 

 Seen on end there is a dorsal plain, and slopes nearly flat ; the dorsal 

 plain, about 0'8mm. broad, would hardly be noticed on end view but 

 for the flange-hairs that mark it out. The hair- bases are smaller, and 

 not so black as in previous skin, and so are less conspicuous ; head 

 black. Six days later, in somewhat sulky condition, 10mm. long, 

 4mm. wide, and 4mm. high, at 1st abdominal segment, sloping 

 gradually backwards ; it has a definite yellow, lateral line, and a dark 

 dorsal line, which is, in fact, the dorsal vessel seen through very 

 transparent tissues ; the larva has generally a very transparent glassy 

 look ; it is of a vivid dark green, with a general effect of being a pale 

 yellowish-green, owing to pale markings that have the appearance of 

 being yellow lines of tissues some way beneath the surface. There are 

 dorsal flange-lines and two oblique lines at equal spaces below this, 

 leaving rather wider space below. Each segment has a depression 

 below the dorsal line, and another in the spiracular region ; these 

 cause rounded surfaces that reflect light so as to much confuse 

 attempts to make out either markings or contour; the hairs are 

 inconspicuous, as already described. When nearly done feeding the 

 larva acquires a yellower tinge for pupation. Head black, true legs 



