NOTES ON LEPIDOPTERA FROM THE PYRENEES. 155 



series of hooks which appear to be attached to an antero-posterior very- 

 narrow strip of chitin, which extends beyond them posteriorly ; the 

 hooks are an anterior and posterior pair with four or five points 

 between them, the posterior of which, though small, is almost a hook. 

 The posterior prolegs (claspers) have four hooks as an outer or anterior 

 set, and three as an inner, with about seven abortive points between. 

 The 7th abdominal segment has no prolegs, but the hairs are disposed 

 as on the 6th. On the 8th abdominal i and ii are comparatively 

 crowded together, nearly into a square ; iv and v are again both below 

 the large spiracle, vi is at posterior border of segment, and vii (?) is 

 below. On the 9th, i is larger, ii wanting, iii well up and forwards ; 

 there are three hairs below spiracular level. The 10th abdominal has 

 a large anal plate with four hairs along its posterior border, one on 

 each side, halfway up, and one below this, in from the border, quite on 

 tlie disc, a total of eight hairs. The claspers have a large plate with 

 seven hairs and a narrow plate with two. The hairs are for the most 

 part very small, with dark round hemispherical bases, transparent, 

 somewhat clubbed, with some spiculation or division as for a 

 glandular opening at the apex, the longer hairs are simple, about 

 0-02mm.-0-03mm. long., but larger and stronger as we approach 

 the end segment ; on the 6th abdominal the longest are perhaps 

 005mm., and on the 9th and 10th about 009mm. The skin- 

 surface has a network outHned in fine dots giving polygonal spaces 

 of very varying form, and often being as if the division between 

 several were missing. The hair-bases have processes that radiate into 

 these lines, as if they were starting-points for them, although the skin 

 looks nearly structureless in the line of i and ii, and again of iii, and 

 is well marked out in the intervals [Octobfr Qtli, 1907). Second ivstar 

 (from living larva) : Is a straight cylindrical larva that keeps itself 

 straight under all circumstances when at rest ; towards next moult 

 7"0m[m. long, O-Hmm. wide, head rather narrower, and flaps of claspers 

 making a little lateral projection. The colour is ochreous-brown, with 

 longitudinal lighter and darker lines ; between a double pale dorsal 

 line IS a darker shade, intensified into a short, nearly black, streak in 

 the middle of each segment ; there is, subdorsally, another fine pale 

 line, and the space between this and the dorsal line presents also a dark 

 mark at the front margin of the segment, then follows a darker space, 

 a pale almost yellow line, then a ground colour space, then a pale 

 yellowish flange line, rather wider than the pale lines above. In the 

 fullfed larva there is no flange projection, but the yellow line (sub- 

 spiracular) makes the larva, from some points of view, look as if there 

 were one , below the yellow line is a darker band, ventrally again is paler, 

 with two yellow lines. The head, legs, etc., are self-coloured, and no 

 hairs or tubercles are seen with a hand lens. In the second instar, 

 from a mounted skin, the larva is very like the first, but larger. The 

 hairs and tubercles seem to be precisely the same, but with certain 

 additions. The prothoracic plate is now long and square, with four 

 hairs along the front and four across the middle. The hairs are, for 

 the most part, but little larger than in first instar, but the long hairs 

 of the anal plate are about O'lmm. to 0-12mm. The spiracles have a 

 broader border and smaller opening, and the crenate rim is less evident. 

 The prolegs of the 6th abdominal have three hooks at either end and 

 seven intermediate nodules. The claspers have four hooks at each end, 



