SATURNIA PAVONIA. 323 



strongly developed on the posterior border of segments, usually to the ex- 

 tent of a broad continuous band round segment, that on the anterior border 

 is usually reduced to two large spots in front of i and iii respectively. 

 The tubercles themselves are usually pink, but may be green or may 

 be black with a green or pink point. The whole of i may be black, 

 or only those on front segments. The head may be entirely green 

 except a black line round the clypeus, or it may be black with the 

 centre of clypeus, a line on each side and a patch at hind 

 margin green. The black persists in centre of face beside 

 clypeus. It is obvious to conclude that, at this stage, the larva 

 might be entirely black above lateral line, or entirely green with 

 green or pink tubercles, were sufficient specimens at command. 

 Of those in my possession the greenest has pink tubercles, all surrounded 

 by very narrow black lines, a black triangle at anterior margin of each 

 segment dorsally, and also above iii, a black dot mediodorsally on 3rd 

 thoracic and 6th abdominal segments and a black bar across the 

 dorsum between tubercles i on the intermediate segments, 3 or 

 4 black spots above v, one being the spiracle, a slender vertical line 

 behind iii and a black dot behind that, and another above iii. When 

 the larva is extended, the black triangles at anterior border of segments 

 are seen to be connected by a black line round posterior margin of 

 preceding segment. The head has a black line round clypeus — 

 secondary hairs white, arising from minute black dots. The darkest 

 specimen has black tubercles, i and iii only with coloured centres, tuber- 

 cles v (subspiracular) have black circles, and there is a suspicion of 

 orange tinting on the green of lateral line and beneath iii. The 

 green patches of i are square, and right away in front of tubercle 

 iii are irregular lunules below and in front of them. There is a 

 large green patch on posterior border of segments, on either side, 

 narrow below and wide where it reaches forwards, nearly to line 

 of tubercles and just between them. The green invasion is a little 

 stronger on the meso- and metathorax and on the 7th, 8th, and 9th ab- 

 dominals, in that the posterior patch meets the patch before i between 

 the tubercles i and iii. Head black, with green clypeus, a line on each 

 side of it and posterior margin of epicranium. Though the subseg- 

 mentation is indistinct, there appear to be three ridges behind that 

 carrying tubercles, and on these the secondary hairs are arranged with 

 some regularity. There are about 9 hairs (subsegments? ) along the 

 length of a segment, and their distances from each other are about the 

 same in the transverse direction. This 4th stage is then identical in colour- 

 ing with the last stage, but the black is more dominant. In the last 

 stage a wholly green larva is common, possibly to be called the 

 type, here it is rare, and is only very closely approached by the 

 greenest one in the specimens under observation. Whilst dark larvae 

 are more abundant than in last stage, a larva quite black (except 

 lateral line) seems quite possible at this stage, but in last stage 

 could only occur as an extremely rare variation (Chapman. June 1901). 

 Last stadium : Head and body bright green, the skin covered 

 with minute tubercular points, each giving rise to a stout white 

 bristly hair. Dorsally : head green, edges of clypeus margined 

 with black, covered with many white and a few longer black hairs 

 ocelli on a dark patch, the antennas pale, orange-brown, mouth- 

 parts also brown. Prothorax with two dorsal yellow tubercular 



