AGRIADES CORIDON. 69 



colourless or faintly ochreous tint, but, when fullgrown in the first 

 instar, it has a reddish -brown dorsal line, a reddish-brown patch just 

 outside the middle of dorsal ridge (of each segment) extending to the first 

 lenticle, a reddish band through the second lenticle, this one is the darkest, 

 and another round and below the spiracle ; these dark portions, how- 

 ever, extend upwards at the front of each segment, downwards at the 

 posterior margin, especially the first one reaches down behind the first 

 lenticles, and so the pale areas, which are of the original ground 

 colour, are now rather the markings, and show already some indica- 

 tions, of the oblique lines. The dorsal flat is rather broad and smooth, 

 the ridges bounding it rounded, the slopes also are fairly flat, and 

 very nearly three times as wide as the dorsal flat ; the slopes are less 

 steep than in the larva of Polyommatus icarus, consequently the width 

 at the marginal flange is greater in proportion to the width of the 

 dorsal flat than in that species. Second instar : Length 2|mm. In 

 the second instar the hairs, etc., are much more numerous, e.y., on the 

 dorsum there are the seta? of tubercles i and ii, and two in front of i, 

 one below and outside ii, and, in addition, one inside and behind ii 

 that has a curious arrangement; on the 6th abdominal there is a pair 

 (one on each side) of such hairs ; on the 2nd abdominal, that of the 

 right side only ; on the 3rd abdominal that on the left ; whilst on the 

 4th, 5th, and 6th abdominals, there is only one hair, and it is nearly 

 central, so that it is impossible to say to which side it belongs ; apart 

 from the segments in front, one would describe it on these segments as a 

 central azygos hair. As to colouring, there are pale, almost yellow, 

 bands down the dorsal and lateral flanges; between these the reddish- 

 brown is more extensive than at the end of the previous instar; the 

 light (not yellow, but faint ochreous) colour forms round a patch of spicules 

 which extends upwards, this upper portion almost forming a con- 

 tinuous line ; above this is a dark band, and between it and the 

 upper dark band bounding the yellow dorsal line, is a pale portion, 

 hardly a continuous band. The segment is divided into two sub- 

 segments, but only partially by a vertical depression down the "slope." 

 On June 4th, 1906, now half-fed in the second instar, the larva is 3*3mm. 

 long, thick, and about 64mm. wide for the whole length, except the 

 rounded ends. Head black, the markings outlined at end of the first 

 stage, are now plainer ; a pale yellowish band along ridges, lateral 

 ridge faintly paler than ground, above this dark, until a pale line mid- 

 way up slope is reached, then a dark line, then another pale one, and 

 above this a patchy dark line under the flanges. The ground colour is 

 of a pale ochreous, which becomes dark green where the intestinal 



blackish on the dorsal area, but paler on the ventral ; these give the surface an 

 appearance of roughness. Primary tubercles conspicuous, black, and each emit- 

 ting a stout, white, spiculate seta, those on the trapezoidal tubercles being strongly 

 curved, while those on the sides of the body are almost straight. The dorsal area 

 bears a number of large and conspicuous lenticles, the metathoracic and first seven 

 abdominal segments having each one on or near the subdorsal line. A smaller 

 lenticle is also carried by the same segments about midway between the large 

 lenticle and the lateral ridge, but these are not all in the same relative position, 

 that on the metathoracic and 1st, 2nd, 3rd, 4th, 5th, and 7th abdominal segments 

 being situate further back on the segment than the large lenticle, while on 

 segment 6 the small lenticle is just above the spiracle and in the same lateral line, 

 the large lenticle occupying a position near the posterior margin of the segment 

 (A. L. Ray ward). 



