CYANIRIS SEMIARGUS. 291 



the lateral line is pale greenish-yellow, the hair-bases are still black, 

 but very inconspicuous compared with what they were in previous instar. 

 The dorsal ridges are faintly marked in end view, and, on lateral view, 

 each segment is raised and rounded, but flat compared with many 

 Lycaenid larvae ; two little white spots mark the eversible caruncles of 

 the 8th abdominal segment. The slopes are upholstered remarkably, 

 especially by an upper deep depression and a lower smaller one. The 

 prothoracic plate is distinct, but not of a different colour ; true legs 

 dark, but not black. In the third (hybernating) instar there is a 

 strength and consistence of hairs and hair-bases much beyond that of 

 the two previous instars. There is some considerable variation in 

 individuals, in the number and disposition of the hairs, as, for instance, 

 on the 1st abdominal segment, across dorsum from spiracle to spiracle, 

 there are 26 hairs and lenticles in one specimen and 29 in another. 

 Again, in the second instar (on one specimen mounted) the posterior 

 pair of large hairs only persisted, the others (anterior) being repre- 

 sented by lenticles. In this instar the opposite sides of the plate often 

 differ, in one specimen the front (original) lenticle is absent on one 

 side, but there is a short hair a little further back. In another there 

 are the two front lenticles, behind these a pair of small hairs, and then 

 a pair of large lenticles ; from their position these rather represent 

 the anterior pair of long hairs, the posterior being quite obsolete, 

 and the two small hairs being a new appearance ; there is also a 

 short hair close to the special hair on one side, nothing on the other 

 to correspond. In another, one front lenticle is wanting, then there is 

 a pair of short hairs with a lenticle between them, and a second 

 further back (taking these to be a pair, they are quite twisted out of 

 correspondence), then a pair of large lenticles. The honey-gland is 

 marked, and has marginal lenticles and short hairs, but of no special 

 structure. The position of the caruncles (fans) of the 8th abdominal 

 segment is obvious, but their structure not ascertained ; these 

 fans are so delicate that no specimen, preserved without refer- 

 ence to them, shows much, and even when an attempt is made to 

 demonstrate them, it is usually very unsuccessful, obvious as they are 

 when the living larva displays them. In another specimen, more 

 nearly normal, are the two front lenticles (not quite symmetrical), two 

 short hairs, and two large lenticles, and a short hair close to the special 

 hair on one side only. In this specimen the honey-gland is marked 

 by a special pair of lenticles and several others, the usual allowance 

 for an abdominal segment being four or five near the spiracle, and 

 only one pair near the dorsum. The hair-bases have decided coronal 

 spines, and the hairs have very few, but fairly large, spicules. Many 

 of the smaller hairs are scimitar-shaped, with spicules on the convex 

 side and towards the apex. The coronal spines are less marked in the 

 lenticles. One or two fine hairs at the bases of the prolegs have very 

 fine and very numerous spicules, giving a different character to them. 

 The spiracles are raised, pork-pie shaped, and are of very elaborate 

 structure, including apparently rings of minute raised dots on the outer 

 surface. The pads of the prolegs possess each one large and two small 

 hooks. Fourth (penultimate) instar (April 20th, 1908) : Still faintly 

 greenish-white, skin with black skin -points ; no markings ; 6mm. 

 long, l-2mm. high, l-5mm. wide; the prothorax looks dark from black 

 head buried in its interior ; a good crest of hairs down each side of 



