NOTES ON THE LIFE-HISTORY OF OCNOGYNA BOETICA. 263 



they spring. The hairs are not so long as in the genns Arctia at this stage 

 {ej/., A. villica, A.fasciata or A.hebe). Microscopical appearance. — Tuber- 

 cles very prominent, more rounded in shape, particularly the large 

 subdorsals (ii). Each tubercle on a slight fleshy elevation. The tubercles 

 form well-raised, shiny black warts covered Avith numerous conical hair- 

 bases. The hairs on the prothoracic plate appear to be arranged in 

 two principal bunches, and look less generally scattered than before. 

 The number of hairs has again greatly increased. They are so 

 numerous as to be difficult to count on the prothoracic plate. The 

 small tubercle i on abdominals has now three to six hairs, shorter and 

 finer than most of the others. They are brownish. Tubercle ii is 

 very large, with numerous hairs, fourteen or more, those on the inner 

 side brownish, the long centre ones and externals black. Tubercle iii 

 has black hairs, and they have increased in number here as elsewhere. 

 The mottled brown subdorsal line is more consistent and also darker. 

 Light dorsal line distinct. The lateral area is of a suffused greyish colour 

 wdth little distinct mottling; darker along the spiracular area, lateral 

 border light again. The segments are pretty deeply incised, swelling 

 out in the centre. This sw'elling is niade more prominent by the size 

 of the tubercles. Length at the end of third stage 7mm. 



A larva entered fourth stage January 7th, many others are moulting. 

 By January 15th all but one were in the fourth stage, and well advanced. 

 By January 22nd many looked bloated, as though they had reached 

 their maximum in this stage, but none are actually lying up for the 

 fourth moult yet. They feed very well indeed, but rarely eat the leaf 

 right down, preferring still to eat away the cuticle from either the upper- 

 or underside. I have not yet put them out-of-doors on growing plants, 

 but have them still inside in a tin in a fairly warm room. As the 

 weather is now warmer and moister, I must soon put them on growing 

 groundsel outside. The larval hairs are not very long as compared with 

 Arctia. They are stiffish, but not so stiff as in ^. pudica. The larvae 

 are lively, and show a tendency to wander when the lid of their box is 

 removed. They are not quite so nervous and rapid in their movements 

 as those of A. hebe, A. villica, and especially A. jmrpurata. If disturbed 

 when they are warm, they will make short rushes forward, much like 

 most other Arctiid larva;. They spin a little silk, but not much. 



Fourth imtar : Head still black and shiny, but not more hairy than 

 before. It appears dented in the centre, with a V-shaped embossed 

 mark. Tubercles also jet black. They stand out very distinctly, their 

 shape is more rounded, and they look better finished off than before, 

 reminding one of well-filled pincushions. The hairs springing from 

 them now are chiefly golden-brown, though the longer ones are 

 black. They appear to be more numerous than in third stage. 

 The hairs from tubercle i on abdominals are, with very few exceptions 

 golden-brown. The central dorsal line of whitish ground-colour is 

 proportionately narrower but more clearly defined. The broad sub- 

 dorsal mottling of dark colour is very thick. It leaves a ring of 

 light ground-colour round the bases of abdominal iii. Below it 

 the lateral area is also chequered with chocolate, but not nearly so 

 thickly, and the tubercles are all ringed with a clear space of ground- 

 colour. The spiracles on abdominal segments are situated just above 

 tubercle v, and are level with its anterior edge. They are almost 

 round, and are small, of a light semi-opaque brown, with a vertical 



