218 BRITISH BUTTERFLIES. 



are long ; the anal claspers have two long and one short, but, in one 

 case, one side is so the other has four medium and two long. The 

 skin-points are very numerous; in profile they are sharp and pointed, in 

 vertical view they have several radiating or zigzag lines. Third instar 

 (newly-moulted March 31st, 1908): Two specimens in this instar (one 

 a little grown) 4'0mm. and 4'5mm. long. [Much the same in general 

 markings as in previous instar, rather darker, perhaps, but, in previous 

 instar, the larva assumes a brighter colour as it grows, and this will 

 doubtless do the same.] The broad dark dorsal band is distinct, the 

 rest of the larva not so dark, and, though the markings seem the 

 same as in last instar, are much less distinct, and the brown slopes 

 have a distinctly olive tone, suggesting, of course, a greenish deeper 

 layer. The form is also the same — broad, flat, with sides parallel from 

 nearly end to end. The " fans " on the 8th abdominal segment were 

 displayed by one specimen several times in walking about, and are very 

 large, and, being pale, very conspicuous; when retracted and quiescent, 

 their position is still very obvious as a rather pale circular spot ; in 

 this instar the hair-bases are conspicuous as (?) white dots. Third 

 instar (nearly full-fed, April 5th, 1908): 6'0mm. long ; nearly same 

 width from end to end, and same height from mesothorax to 6th 

 abdominal segment. The prothorax distinctly at a lower level than 

 the mesothorax, which overhangs it a little, and looking, on side view, 

 very like the 7th- 10th abdominal segments at other end, so that the 

 two ends are very similar ; the central segments have a distinct 

 serrated arrangement seen laterally, the highest point of each segment 

 being at about the junction of the middle and posterior third ; the 

 front portion has, therefore, a less slope ; the slopes are at about 90° 

 or 100° to each other. To the naked eye, the larva is of an incon- 

 spicuous dirty- grey colour, but, under a lens, this effect is seen to be 

 produced by elaborate markings of pleasing and contrasted colours. 

 The broad dorsal band (flat, hardly furrow) is of a rich red-brown, a 

 little widened on the meso- and metathorax, and narrowing a little back- 

 wards to 6th abdominal segment ; it has a fine creamy-white line on 

 each side, in which are black dots of hair-bases (white just after 

 moult). The lateral line is white, but does not show on a dorsal view ; 

 it is conspicuously dotted with dark hair-bases. The slope 

 between these two white lines has six longitudinal lines or 

 bands ; the upper, nearly, but not quite, as wide as the other five 

 together, is a pale olive-green, then a pale brown, an olive -green, a 

 very pale brown, these two very narrow, then an olive-green, then a 

 pale brown ; the latter encroaches on the olive above it, so as nearly 

 to divide it into a series of spots. The prothorax hardly carries 

 these same lines, but is rather dark, with a still darker plate; similarly, 

 the 7th, 8th, 9th and 10th abdominal segments have the lines obscurely 

 continued, chiefly as a dark central band, broadest behind, with white 

 border. One specimen protrudes the fans now and theu. On April 

 8th, the largest of these larvae in the third instar, have now changed 

 the olive-green to a definite apple-green. There is still the dorsal 

 brown band, with its white border and the nearly white lateral line, 

 the space between is green, though the lines between can be made out, 

 especially the brown line, which, as a brownish line, is still plain; its 

 portions on each segment being en echelon, i.e., it is higher at the 

 front than at the back of the segment, as are also the paler and darker 



