NISONIADES TAGES. 277 



narrower than the 5th, the 7th narrower than the 6th, the 8th much 

 narrower than the 7th, the 9th and 10th about the same width but 

 narrower than the 8th. The 10th segment is bluntly rounded. When 

 viewed in profile the dorsal outline of the larva is highest on the 4th 

 abdominal segment, whence it slopes quickly, but evenly, down to the 

 10th abdominal segment on one side, and to the head on the other, 

 but it drops suddenly at the prothorax, as if this segment had slipped 

 down out of place. The prothorax appears to consist of four sub- 

 segments, the 1st and 4th being very small. The meso- and 

 metathorax have each five subsegments, the 2nd and 3rd of which 

 are larger than the other three. The 1st to 6th abdominal segments 

 have each five subsegments, the 1st being very large, while the 2nd is 

 only a little larger than the three following. The 7th abdominal has 

 but four subsegments, a large, a moderate, and two small ones. The 

 8th has three, a large first, smaller second, and smallest third ; while 

 the 9th has two small subsegments. The 10th consists of the long 

 and much wrinkled anal flap. The head is covered with deep pits, of 

 very irregular size and shape, surrounded by highly raised borders. 

 In the pits are small black warts, each with a single soft pointed seta, 

 plain on one side and slightly serrated on the other. There may be 

 one such seta or four, or even more in the same pit. There are also 

 several longer and stouter hairs, which rise from larger tubercles. On 

 the clypeus near its apex is a pair of small lenticles, similar to those 

 on the body of the larva, and another pair lower down and wider 

 apart. Most of the dorsal area of the prothorax is occupied by the 

 thoracic shield. This is divided by a mediodorsal line and, also 

 transversely, by a deep crease, which, however, terminates before 

 reaching the lateral borders of the shield. On the shield are numerous 

 dark warts, each with a short, stiff, sharply pointed seta. On each 

 side of the mediodorsal line, and not far from it, the shield bears a 

 rather oval lenticle, and there is another near the lateral termination 

 of the shield, and a third below on the edge of the shield. Below this 

 latter is a small wart bearing a very long hair (seta) (0"5mm.). Below 

 the shield lies the very large ochreous spiracle with a lighter ochreous 

 margin. Between the spiracle and the leg is a fourth lenticle. The 

 lenticles of this instar resemble those of the fourth instar, being 

 fairly circular, ochreous, with a broad, shining, black, raised border. 

 Beneath, just in front of the legs, the large chin-gland is situated, and 

 appears as an oval swelling with a deep transverse depression in the 

 centre. The dorsal lenticles on the mesothorax are absent, but there 

 is a subdorsal lenticle. Behind this is a wart which carries a very 

 long hair, similar to that mentioned as occurring on the prothorax. 

 Perhaps this is the primary tubercle hi. Another lenticle is situated 

 above the legs. The metathorax has a pair of dorsal lenticles on the 

 3rd subsegment, one on either side of the mediodorsal line. Below 

 these is a pair of lenticles side by side. It looks as though the 

 posterior of these two represents the wart with the long hair of the 

 mesothorax, for that wart is not present on the metathorax. There is 

 a lenticle above the leg. The 1st abdominal has the pair of dorsal 

 lenticles on the 1st subsegment, while the lenticle above the spiracle 

 is on the 2nd subsegment, the spiracle itself lying between these two 

 subsegments. Below the spiracle, on the flange, are two lenticles, one 

 behind the other. Beneath the larva are four lenticles arranged in 



