204 BRITISH BUTTERFLIES. 



the prothorax ; the central wart is largest ; on the anal segment is an 

 elongated oval black mark, narrowed in the centre. On July 24th, 

 being 30 days old, and still in this instar, it was 12-5mm. long, 

 2-5mm. in diameter, and perfectly cylindrical throughout. Third 

 moult, on July 30tb. Fourth instar (August 6th) : 17'5mm. long ; 

 the body of the same shape as in previous stage; colour, pale whitish - 

 green ; a longitudinal mediodorsal line, rather dark green, bordered on 

 each side by an almost white, very fine, line, followed by alternate 

 darker and lighter lines, the lightest being extremely fine ; then a 

 subdorsal darker green line, bordered laterally by a conspicuous 

 whitish line, which is again bordered below by a paler and indistinct 

 green line, and a very faint spiracular whitish stripe, on which the 

 spiracles are placed; they are white, outlined by a dark, but indistinct, 

 ring ; the undersurface is whitish-green ; the head is about the same 

 width as the body, rather depressed, and of a pale greenish-grey colour, 

 with black markings, one central between the lobes, and one down the 

 middle of each lobe, the central one bifurcating and uniting the others 

 in front ; the eyespots are black ; both head and body are clothed with 

 very short stiff hairs ; the anal segment is elongated, porrected and 

 flattened, overlapping the hind claspers; the central black marking, 

 previously mentioned, is, in this stage, very conspicuous ; the legs 

 are dark grey, with whitish extremities ; the claspers of the same 

 colour as the undersurface ; the segments are transversely wrinkled. 

 The fourth and last moult took place on August 17th. Fifth instar 

 (August 18th) : Colour of a clear, pale whitish-green ; at each 

 segmental division the skin is loosely wrinkled, each fold or wrinkle 

 being pale yellowish-white, especially noticeable between the first 

 six or seven segments; the remainder are fairly uniform in colour; 

 each segment is delicately wrinkled transversely, in addition to the 

 divisional folds mentioned. With this moult, a great and important 

 change takes place, i.e., in the colouring of the head, and the disappear- 

 ance of the oval black blotch on the anal segment (so conspicuous in 

 the former stage), the black warts, and the prothoracic collar. The 

 head is now entirely of a pale whitish-green, with a faint bluish tinge, 

 excepting an extremely fine central black line, separating the lobes of 

 the crown, and there are six tiny black ocelli; five in the form of a 

 crescent, and the two lowest are the most conspicuous and bead-like. 

 On each segment are a few exceedingly small black specks, only just 

 visible by the aid of a strong lens ; the most distinct are those forming 

 a double longitudinal dorsal series, two in the middle of each segment ; 

 these appear concave, and very metallic, reflecting a high light ; the 

 markings appear precisely similar to those in the previous stage. The 

 legs, claspers and undersurface are uniformly pale green in colour ; 

 below the spiracles, the body is dilated, making the undersurface flat 

 and rather concave. The head is large, fully 2mm. in length, and 

 broad in proportion ; it is porrected, and slightly compressed on 

 the crown ; the body is about the same width as the head, and of 

 equal thickness throughout ; the anal flap is of the same form as 

 before moulting; both the head and body are clothed with short fine 

 hair; the surface of the head finely granulated. Later (September 

 12th) : Considerably increased in length, 23 -5mm. ; the colour 

 changed to a clear yellowish -green, but still pale ; in other respects 

 it is the same as described. Later (October 3rd) : Now 101 



