NOTODONTA ZIOZAO. 153 



black head, much wider than the second segment, 

 with the face somewhat heart-shaped and broadest 

 above ; there is a small dorsal hump on 12, the rest of 

 the body smooth ; the body yellow, the head and 

 narrow collar on segment 2 black, a narrow brown 

 stripe on the back, the tubercular dots small, black, 

 but some of those near the tail larger, each bearing a 

 short black hair. After the larva begins to feed, a 

 greenish tinge comes over the body ; at first the larva 

 gnawed only one side of a willow leaf, leaving the 

 opposite skin and all the ribs untouched. The first 

 moult comes in about six days, and at once develops 

 the characteristic shape of the larva. The length is 

 about 7 mm., the head is still larger than the front 

 segments, there is a sharp dorsal hump on 6, and a 

 smaller one on 7, and a pyramidal hump on 12 ; the 

 colour I noted as whitish-grey, a broad, darker dorsal 

 stripe on 2 to 6, thence a thin dorsal line widening 

 again on 12 ; on 2 and 3 a yellow spiracular stripe ; 

 some short dark streaks on the sides, the belly dusky. 

 The second moult comes in about six days more, the 

 length about 12 mm., the figure and colouring more 

 developed, some larvae showing a pink tinge. 



The full-grown larva is generally handsome, but 

 varies a good deal in colouring ; I have short notes of 

 one which was lilac above, dark brown below, the 

 hump on 12 orange-red with yellow streaks, a yellowish 

 line along the spiracles. The variety I described most 

 fully was paler ; the length 40 mm., the body stout, 

 more slender in front, the head wider than segment 2, 

 and in height also rising above it, notched on the 

 crown ; the front segments somewhat flattened ; on 6 

 and 7 saw-toothed dorsal humps, larger on 6, smaller 

 on 7 ; on 12 a square pyramidal hump ; the ventral 

 prolegs strong, the anal prolegs small ; the colour 

 mostly a mixture of pale delicate grey and pink ; the 

 head pale stone colour ; a dorsal patch of orange edged 

 with brown on 2 — 4 ; on 5, and again on 8 — 11, a grey 

 dorsal line ; the hump on 6 orange-brown, on 7 



