FTtillOPHORUS SPILODAOTYLUS. 377 



of the larva is green, sprinkled with minute black dots. 

 The tubercles are : two dorsal rows (four on each seg- 

 ment), whitish, each emitting a star-like tuft of white 

 hairs ; the subdorsal are one wart on each segment, 

 with a star-like tuft of white hairs ; the spiracular are 

 one wart on each segment, emitting a star-like tuft of 

 white hairs, and two or three longer whitish hairs. 

 The prolegs and claspers are semi-transparent, with 

 a green tinge, and tipped with brown. 



The food-plant is white horehound, Marrubium 

 vidgare ; the larva feeds on the terminal leaves; it 

 rests on the upper surface of a leaf in damp or dull 

 weather, but hides under the leaves when the sun 

 shines. June and July. 



The pupa is green, with whitish warts and hairs, the 

 wing-cases are paler green, thickly studded with short 

 whitish bristles along the edges. It is fastened by the 

 anal segment to the upper surface of the leaf of the 

 food-plant. July. 



I have to acknowledge my indebtedness to Mr. 

 Carrington for a supply of the larvae, obtained from 

 Mr. Rogers, of Freshwater, Isle of Wight. In 1879 

 I met with this * plume ' in all stages in the Isle of 

 Wight. Horehound, the food-plant, is very local in 

 Great Britain, and in some places its growth is of a 

 most stunted character; a few plants I met with in 

 Norfolk were only about two inches high. In gardens, 

 however, the plant usually attains a respectable size, 

 and I have found it more profitable to search such 

 plants when they could be found, within say a two- 

 mile radius of the wild plants. All the larvas I 

 obtained at Ventnor, Isle of Wight, were taken off 

 horehound growing in cottage gardens, about a mile 

 from the reputed locality of the wild Marrubium. 

 (Richard South; Entom., February, 1883, XVI, 29.) 



