214 BRITISH BUTTERFLIES. 



almost too elaborate for easy description. The dorsal plain 

 or groove is dark rich brown, broadened a little on the thorax ; the 

 dorsal flanges are tipped with white, giving the effect of a pale line 

 along i; there is again a pale line along the two little hairs, represent- 

 ing hi, and another along the lateral flange (iv and v); the area 

 between i and iii is pale terra-cotta, with a few darker marblings, the 

 area between iii and v is nearly as dark as the dorsal plain ; there is 

 less dark area below the pale lateral line, only interrupted by a short 

 w 7 hite streak through vi ; this gives the effect of a white line, though, 

 on each segment, it extends to hardly half the width of the segment ; 

 there is also a little pale vertical streak in front of, and above, this 

 longitudinal one. There are also white patches in the areas between 

 tubercles i to iii, and between tubercles iii to v, which look like 

 representatives of oblique stripes ; the hairs stand out colourless, or 

 brilliant and silvery in a good light ; their bases are the same colour 

 as the skin ; though I mention these white spots vaguely, they have their 

 exact and definite position on each segment. The white streak through 

 tubercle iii does not quite turn round the ends on prothorax and terminal 

 segments, but so nearly does so that, on a dorsal view, it appears as a 

 continuous line round the insect. On the abdominal segments, the seta 

 of i has a large, black, thimble-shaped base, with a long, white, spicu- 

 lated hair, curved so as to be directed first rather forward, then upw r ard, 

 then backward, in length about 03mm.;iiis much smaller, at an appreci- 

 able distance outside, and behind, i, with a short hair (less than Olmm.). 

 There is a minute hair at anterior border of segment, just in line with ii, 

 and usually hidden in incision ; below ii are two large lenticles placed 

 diagonally, the first one upper ; below this are tw T o very minute hairs at 

 a level, then the spiracles on a flange, and below this another flange with 

 three hairs on a level, the middle rather the longest, and below T this 

 several hairs above bases of prolegs ; the two little hairs above the 

 spiracle are extremely short, clubbed, and rather directed towards each 

 other, and look very different from the other hairs. On the 2nd, 3rd, 

 and 7th abdominal segments are lenticles, above the prolegs, amongst 

 the lower hairs ; on the 7th abdominal, the highest lenticle takes the 

 place of ii, and on the 8th abdominal it has worked round to the front 

 outer angle of tubercle i (if it is i). The thimble-shaped bases of the 

 hairs are all black, and the three flange-hairs give a row of marginal 

 dots when the larva is seen from above. There is a lenticle in front 

 of, and below, the spiracle on the 1st abdominal segment, and one 

 behind the spiracle on the prothorax; the hairs are all finely spiculated, 

 those of i, O'SOmm.-OSSmm., and even (Mmm. and 0'45mm., long, 

 on front and back segments. The prothoracic plate has a lenticle on 

 the middle of the front margin of each side, a hair within and behind 

 this, and another rather behind centre of each side ; three hairs, in 

 front of plate (on each side), and three on flange below these, and in 

 front of spiracle. The 7th, 8th, 9th, and 10th abdominals have no 

 incisions through the flange; the anal plate is without hairs or lenticles; 

 there are two hairs on the second flange (the flange proper is that carry- 

 ing the three little hairs noted above). The prothoracic plate 

 has, on each side, besides the lenticle and two long hairs, a minute 

 stubby hair at front angle, and the curious filamentous hair at outer 

 angle. In a specially preserved dry specimen, the special filamentous 

 prothoracic plate hair stands up 0.05mm. high, stiff and straight, and 



