442 BEITISH BUTTEEFLIES. 



larva grows) ; they are again longer down the dorsal crests and lateral 

 flanges ; the longest about 03mm. Dorsally the incisions seem deeply 

 cut, but the dense coat of hairs certainly increases this appearance. The 

 prothoracic plate (pi. xxv., fig. 1) is whitish, clothed with hairs as the rest 

 of the surface, except that it has, on a dark base, an ordinary (i.e., usual 

 in structure, really extraordinary, see details below) hair at each 

 outer angle ; this hair is not spiculated ; the width of the plate is 

 06mm. The dark hair-base forms a conspicuous black spot. Some of 

 the hairs, at front and back, are about 04mm. long. There is no 

 trace of a gland behind the 8th spiracle, but, on the 7th abdominal 

 segment, is a transverse dorsal slit that opens and shuts occasionally, 

 and has, at each end, some fine stellate spicules (hairs ?), different 

 from anything elsewhere. The spiracles are pale with shining white 

 margins. On June 14th, the larva is still in its 4th (last) instar ; 

 13mm. -14mm. long; head black, smooth ; the dorsal plain red-brown, 

 broadest in front ; the dorsal ridges being round, not ridges, except 

 theoretically ; seen laterally they are flat at top, but the incisions are 

 deep with rounded margins. The mesothorax rises high above the pro- 

 thorax, but not so much as, say, in larva? of Cdllophrys rubi or Thestor 

 ballns. The 7th and following abdominal segments are without 

 dorsal ridges, and slope backwards. The lateral line pink (a flesh- 

 colour), toning into olive up to spiracles (light ochreous), the shade 

 under the ridges and oblique lines yellow, but so overlaid with green 

 as to obscure them ; a subsegmental (?) double depression on slope. 

 Under a lens, the spiracles are silvery and stems of hairs golden, on 

 green ground ; no gland is found in the 8th abdominal segment. 

 In this last instar, the hairs are no longer than in the previous one, 

 a few on the dorsal and lateral flanges, and again in the region of 

 vi, reaching 03mm. ; a few at the posterior margin 0"4mm. 3 then 

 others very much smaller ; the mass about O05mm. long. The rays of 

 the stellate hair-bases are now conical and pointed, and relatively rather 

 shorter than in the previous instar. A large majority of the hairs are 

 nearly straight, and, though some are somewhat curved and somewhat 

 clubbed, none approach the scimitar-form so common in the penultimate 

 stage. They are pointed and boldly spiculate (dentate or serrate ?) 

 (pi. xxv., fig. 2 and pi. xxvi., fig. 2). The skin is again very similar to 

 that of stage 1 — a fine reticulation of delicate lines, almost entirely 

 in triangles, and with an appearance, at the decussations, as of a 

 knob or elevation. These are, however, without any definite struc- 

 ture, and suggest that they are optical effects of a little different 

 density of the cuticle at the angles. In my prepared skins the sites of 

 the glands on the 7th and 8th abdominal segments are very evident, 

 but no structural details are preserved; on the 8th abdominal, 

 portions of skin without hairs or reticulations are seen at the site 

 of the glands, and, on the 7th abdominal, the much larger area 

 has many rather small len tides crowded along its posterior margin 

 and round the ends. The spiracles present the same structure as 

 before, viz., an outer and inner tube held apart by radial pillars 

 (or plates ?), of which ten or twelve may be counted in the upper layer; 

 there is no trace of irregularity in the margin, which is smoothly 

 curved (no lenticles attached as in those of some Theclid larvae) ; 

 they project less proportionately than in the previous skin. The hairs 

 are everywhere abundant, but one can still distinguish the regions 



