STRYMON PRUN1. 207 



(over l'Omm.). The slopes rather flat. The prothorax much over- 

 hung by mesothorax, which is very prominent in the dorsal ridge lines. 

 The ridges themselves, however, in this and the two following segments 

 (metathorax and 1st abdominal), are flat and rounded, and the outline 

 of the segments, seen laterally, is gently waved. The 2nd, 3rd, 4th, 

 and less so the 5th and 6th, abdominals, on the other hand (seen 

 laterally), stand up as angular humps. The oblique lines are well- 

 developed, they begin with the white line on outer side of the dorsal 

 ridge. The posterior portion, owing to the angular prominences 

 of this ridge, runs downwards and backwards, continues through the 

 oblique line proper of the following segment, and then, passing to the 

 next one, goes on as the second oblique line above the spiracle. 

 The " slope " is hardly cushioned at all, but, in a specimen with some 

 feeding still to do, the lateral flange stands out as a round rib, and the 

 prominences below are marked and rounded. The fine hairs are black ; 

 they are very short over the dorsal flange, as elsewhere, those of the 

 lateral flange, and especially those below, are longer and pale. 

 Another example (mounted), examined for structural detail, has: Head 

 pale castaneous, transparent, dark round the five ocelli, that lie in a 

 curve round the larger central one (in pale area) ; two longish hairs 

 towards front of clypeus and near antennas, and a good many very 

 small ones, scattered, but obviously symmetrical at fixed positions; 

 otherwise, the head is smooth and polished. The transparent labrum 

 shows, on each side, three curious marks or processes, looking just like 

 the catches to hold a ratchet-wheel, the jaws with four large teeth, two 

 others, small, one at each end, a further small one halfway down 

 posterior margin, and four or five minute ones on a ridge running in 

 from posterior end ; no doubt, when correctly viewed, this ridge forms 

 a continuous curved line with the four large teeth. The prothoracic 

 plate is ill-defined, chiefly by a line in front of it without hairs ; it is 

 wide across (1mm.), and very narrow (02mm.), from back to front; it 

 is of the same tint as the skin generally (extremely pale castaneous in 

 mounted specimen) ; each side has about seventy hairs and five or six 

 lenticles ; the hairs are about Olmm. long ; the portion of segment in 

 front has several times as many, and longer, hairs, with no distinct 

 demarcation between dorsal, lateral, and marginal. The mesothorax 

 has a (subsegmental?) line marking off, dorsally, a front portion (over- 

 hanging prothorax) and a posterior one ; the front is rather the wider, 

 and has more, and longer, hairs ; the hairs are, perhaps, 200 or 300 

 on each side ; they are dark chitinous on, and above, lateral flange, 

 longer, but colourless, below. On the metathorax and 1st abdominal 

 segment, the hairs are longer, darker, and more numerous on the 

 dorsal flanges, the segments being here wider, and admitting of 

 these being humps ; on all these segments, lenticles are numerous, 

 but scattered, and seem very few in comparison with the abundant 

 hairs. On the three following segments the humps are more 

 distinct, with a mediodorsal area free from hairs, but containing 

 six to ten lenticles. This area is in front of the humps and is inter- 

 segmental ; it is less free from hairs in other specimens, but equally 

 abounds in lenticles and the skin network to some degree radiates 

 on it from a central point. On the 5th abdominal the two humps 

 are not distinguishable, but conjoin in the middle line, but with the 

 full width of two humps. The width diminishes on the following 



