240 Lilian J. Gould's experiments 



third, and fourth larvffi moulted, I recorded their exact 

 appearance now. In the third larva the spiracular row 

 of spots was faint in colour, but distinct ; they were 

 nine in number, on the first thoracic segment and abdo- 

 minals 1 — 8, and were orange-red in colour. Those on 

 abdominal segments 1 — 7 were posterior to each stripe. 

 The shagreen pale yellow dots were placed in vertical 

 lines following the rings of the body. The oblique 

 stripes were primrose-yellow, and the first was the 

 most distinct. I could see no trace of the eighth stripe 

 observed by Mr. Poulton in Smcrinthus larva and Spliinx 

 ligustri (Trans. Ent. Soc. Lond., 1886, Part II., and 

 previous papers). The caudal horn was black-dotted on 

 the upper surface, yellow beneath ; there were faint 

 traces of the red line extending up the sides from the 

 base. The apex of the head was bifid and faintly red. 

 The thoracic legs were very faintly rosy ; there was 

 no red on the claspers. The length of the larva was 

 3 cm. The fourth larva was exactly as the third. The 

 second larva was evidently nearer the fourth ecdysis ; 

 its general ground colour was darker green than that of 

 the others, the stripes and shagreening yellower. The 

 apex of the head was distinctly orange-red and bifid. 

 Only the spiracular row of spots was developed, on the 

 same segments as in the others, but a darkening under 

 the skin was perceptible anterior to the fourth, fifth, 

 and sixth stripes, where the upper row of spots ultimately 

 appears. The caudal horn was black-dotted on a green 

 upper surface, and the red lines from the base upwards 

 were more distinct than in the third and fourth larvse. 

 The thoracic legs were also redder ; there was no red on 

 the claspers. There was no eighth stripe. 



Sept. 6th.— The fourth ecdysis of the second and third 

 larvjB took place. The second larva developed an upper 

 row of five spots only ; these were in front of the second, 

 third, fourth, fifth, and seventh stripes, viz., on abdominal 

 segments two, three, four, five, and seven. The spots 

 were very small and inconspicuous, also brighter and of 

 a yellower tint than in the first larva, and so narrow in 

 extent as to really appear more like borders than spots 

 at all. Those in front of the second, third, fourth, and 

 fifth stripes occupied three rings each, but were vertically 

 a mere line in width, thus giving the border-like appear- 

 ance. The seventh spot was a mere trace. The two 



