SMERINTHUS OCELLATUS. 101 



segment 7 to 10. After a day's growth there can be 

 seen faint traces of pale slanting streaks on the 

 side. At the first moult the larva is about 9 mm. 

 long ; the horn does not grow except at the moults ; 

 there is now a fuller green thread down the back, 

 on segments 2 — 4 a strong yellowish-white subdorsal 

 line, which goes on faintly to the horn, and on 

 segments 5 — 12 seven whitish streaks slanting up- 

 wards and backwards. After the first moult there 

 comes a change in the form of the head ; it was 

 rounded, but now the lobes become almost trian- 

 gular, and are quite pointed at the top ; the skin 

 becomes covered with little points still emitting the 

 two-pronged hairs ; the horn is now 2*5 mm. long, and 

 still bears tiny spines as before. At the second moult 

 the larva is about 15 mm. long; the skin shows eighb 

 wrinkles to each segment, the subdivisions bearing 

 each a transverse row of pale yellow points. The 

 slanting streaks are yellow ; the lobes of the head out- 

 lined on their outer edges with yellow, their sharp tips 

 rich red; the horn, 3 mm. long, is pale yellow, with a 

 pink line on its upper side. I should notice that the habit 

 of the larva, whilst small, is to eat away both sides of a 

 leaf of sallow or willow, leaving the midrib untouched, 

 and using it as a resting-place. The larva is about 

 20 mm. long at the third moult, and has now become 

 stout in figure ; the face is still long, and the points of 

 the lobes project so much that in some cases they 

 cross one another ; the horn is stout, whitish on the 

 sides, with a purplish stripe on the upper surface-; 

 the rough points on the skin are whitish, and the 

 lateral stripes are whitish, edged in front with deeper 

 green than the ground. At the fourth moult the 

 length is about 35 mm., and the tips of the lobes of 

 the head become shortened, and lose the red tint. The 

 biggest larva I had this summer when full grown was 

 quite three inches (75 mm.) in length, the figure stout 

 and stiff, stoutest about segment 10, and tapering for- 

 wards, and not so much backwards, the face triangular, 



