( xc ) 



" First stage larva. Black, with dorsal yellow-green patch 

 just behind middle of body and a smaller, similar, patch 

 posteriorly. A pair of spines arises from each segment 

 dorsally, the anterior and posterior pairs largest. First 

 ecdysis, June 8. 



'' Second stage larva. Alternately black and bright yellow, 

 the head being black, first segment yellow, and the body 

 ending in a black area. (N.B. — The larva of P. nohilis, on 

 hatching, is of the same appearance.) Second ecdysis, 

 June 12. 



" Third stage larva. The yellow areas are now green. 

 Third ecdysis, June 17. 



" Fourth stage larva. The larva is on the whole much 

 more green in hue. The dark colour now occupies the lateral 

 aspect, but is slate-purple instead of black, and becomes 

 tinted with green as the larva grows larger. At the second 

 and third segments the body is swollen. The first segment 

 is entirely green, and there is a large spine at each angle 

 behind the head. The second segment is slatey-purple : it 

 bears a row of six fine black spines at the anterior margin 

 (three on each side of mid line), but the two innermost ones 

 are very small. The third segment dorsally is green posteriorly 

 but slate-coloured anteriorly, with six spines, of which the 

 outermost is fine and black, the next fine and green with 

 black base, the innermost merely a rounded green tubercle 

 ringed with black. The fourth segment is green. The place 

 of the outermost of the three spines on the second and third 

 segments is taken by a scarlet dot ringed with black; the 

 innermost spine is missing, while the middle one of the three 

 is as on the third segment. Each segment behind the fourth 

 has only one spine on each side — serially homologous with 

 the middle one of the anterior series. The fifth and sixth 

 segments are slatey-purple with the spines black. On the 

 sixth segment, external to the spine, is a small yellowish patch 

 in line with the scarlet dot on the third segment. Segments 

 7 and 8 are green dorsally, and the spines are green. Segment 

 9 is like 5, 10 like 6, and 11 like 7 and 8. The twelfth is 

 whitish, and at its anterior margin is a pair of large whitish 

 spines with the inner aspect of their bases black, joined by a 



