246 BRITISH BUTTERFLIES. 



and 3rd thoracic segments these are all represented by one short hair 

 (0'08mm.) On the 1st abdominal is the spiracle; close above and in 

 front of it is a large lenticle, and halfway between ii and the spiracle 

 another long lenticle ; the two large lenticles are the feature of the 

 "slope"; between them are two short hairs (O08mm.), nearly level, the 

 front one higher and a little longer. The hairs and upper lenticle continue 

 to the 6th abdominal segment, the lower only on the 1st and 2nd abdo- 

 minals, wanting on the 3rd and following abdominal segments. On the 

 7th abdominal segment the spiracle is larger, higher up, and the space 

 available smaller ; what appears to be the upper lenticle is close to 

 the posterior margin of segment, very large, larger than spiracle, 

 and with room for the posterior hair between it and the spiracle ; 

 the anterior hair is just above spiracle; in front of this hair is 

 another very large lenticle (not quite so large as the other) and not in 

 line with, but perhaps the same as, the second lenticle of abdominal 

 segments 1 and 2. On the 8th abdominal segment the spiracle is 

 very large and high up ; it has a small lenticle in front of it ; this is 

 probably in series with the smaller lenticle of previous segment ; there 

 is no other hair or lenticle between ii and the spiracle. The marginal* 

 (subspiracular) flange-hairs are four, three on a level, the first short, 

 the second long (0'2mm.-0-25mm.), and a lower one, between the first 

 and second, usually long (025mm.-03mm.). They have this dis- 

 tribution on the lst-8th abdominal segments, but, on the thorax, the}' 

 are all on different levels, the 1st, 2nd, and 3rd in an oblique line from 

 before backwards and above downwards, the 4th lower than and 

 below the second, or between the 1st and 2nd. On the 9th 

 abdominal segment are two hairs, probably of this series, and 

 six long hairs on the 10th abdominal, below the anal plate. The 

 anal plate appears to be without hairs (unless one or other of 

 these six long hairs belong to it and is not so recognised owing to 

 optical difficulties). The tw T o lower short hairs (true marginal ?) are 

 present on all three thoracic segments, and are represented on the abdo- 

 minal segments by a single hair. On the prothorax they have a small 

 lenticle behind them ; on the 2nd-6th, and on the 9th, abdominal seg- 

 ments, there is a fairly large lenticle above the single hairs. On the 1st, 

 2nd, 7th, and 8th abdominal segments is a minute hair(0-05min.)at the 

 site of prolegs (on abdominal segments 3-6). The prolegs have the usual 

 double pad, each with two large hooks, and the central retractile 

 transparent process ; above these pads, outside, is a short row of four 

 or five very small hooks, and above these two short hairs (armature of 

 prolegs and not marginal). The general surface is covered with 

 abundant black skin-points; they look angular when looked at vertically. 

 but, in profile, are rounded, the hard black chitinous points seeming to 

 be covered with a layer of transparent cuticle. As definite microscopic 

 hairs, of a scale comparable with skin-points rather than with hairs, 

 are certain points at definite situations, not always easy to see 

 and determine, and always (?) at margins of segments (? representing 

 primary hairs of an area, now absorbed in the Intersegmental niein- 



* I fear I use the word " marginal " ambiguously, it comes easy to apply it, 

 as here, to the lateral ilange, which is so distinct a " margin " in Kuralid larvre, 

 but I believe usage more properly applies it to the two small hairs (vii) at the 

 base of legs. 



