296 BRITISH BUTTERFLIES. 



spiculated hairs. Then there are longer hairs (0*3mm.) with the 

 basal halves smooth, the further half with long spicules, longer than 

 the thickness of the hair. Beside, but outside, the plate, are ordinary 

 long hairs (0*7mm.) with very short spicules, mere points, but with 

 long recurrent ridges. Similar hairs to all these occur on other 

 segments ; on the dorsum of the mesothorax are several short ones, 

 0*05 mm., with short, smooth, thin shaft, and globular spiculated head. 

 The hairs on the slopes are more numerous than in- last skin, they are 

 much like the fir-cone hairs of prothorax, except that they have sharp 

 points and are curved, the spiculse larger, and the recurrent lines not 

 so marked. The spiracles are most elaborate and beautiful, defying 

 any useful description; they have four or five lenticles in their margins, 

 and lenticles are also plentiful about them, chiefly above, and at once 

 distinct from hair-bases that have lost hairs by the finely dotted area 

 of the lumen. The prolegs have about eleven hooks (0 - 5mm. long) in 

 the upper outer row ; the two sets (or two pads) of the foot proper 

 are fused together, but distinguishable ; each has about nine or ten 

 long hooks (0-14mm.) and ten or twelve shorter ones (O08mm.), these 

 alternate with each other, there being an extra short one or two at 

 each end and at the middle. On the last segment is a small (0-5mm. 

 across) smooth area, with only four or five hairs and a lenticle or two, 

 that is probably the anal plate. The longest hairs are round the 

 posterior margin, where several are l-3mm. long (Chapman). Final 

 instar (not quite full-grown, June 29th, 1885) : Length about 14mm., 

 greatest width 4-5mm. at the 1st abdominal, where it also measured 

 4mm. in depth from the dorsal ridge to the venter ; at that segment 

 a transverse section would be triangular ; the belly flat ; through 

 the 2nd to 10th abdominal segments the sides slope from the 

 dorsal ridge down to the subspiracular ridge like the roof of a house ; 

 from the metathorax forwards the back widens out, the segments 

 deeply cut, the head dark, small, and quite retractile under the 

 prothorax ; the skin generally dull, but shining along the middle of 

 the back, thickly covered with very short pubescence ; along the 

 dorsal ridge a double row of longer, stiffer bristles, and a single row 

 of them along the subspiracular ridge ; the colour generally of a 

 bright light green ; two lines of pale yellow, being in fact two rows 

 of short streaks, commence on the prothorax, where they are widest 

 apart, drawing nearer through meso- and metathorax, and from 

 thence running parallel along the back ; the subspiracular ridge has 

 a yellow line edging it, which goes all round the anal flap, but on the 

 prothorax stops where it meets the dorsal yellow lines ; on each 

 segment from 1st abdominal backwards are two rows of small yellow 

 streaks slanting downwards and backwards ; on the metathorax there 

 is only the upper streak, none on pro- and mesothorax ; about the 

 middle of the streak in the lower row comes the oval spiracle outlined 

 with brown on a raised round whitish spot ; belly and legs more 

 whitish-green ; the hinder pairs of trapezoidal dots (tubercles ii) can 

 be detected, but not easily, being paler than the ground colour ; the 

 coloration gives the effect of a double dorsal ridge, but this is not so 

 really (Hellins). The head is almost globular, but slightly produced 

 towards the mouth; it is scarcely half so wide as the prothorax; 

 indeed, the head maybe said to be retractile within that segment; 

 the body is shaped somewhat like a little boat turned keel upwards ; 

 the sides are dilated all round, even including the prothorax, the 



