288 tHB entomologist's record. 



colour is variable, some larvas being dull smoky-grey, others pale 

 yellowish-1 jrowu ; the head varies aceording to the ground colour, the 

 smoky type having a pale grey head, the yellow type an orange head 

 with a dark streak on each lobe. The hump is well developed on the 

 5th abdominal, and is orange in colour. The dorsal tubercles are very 

 prominent, orange in colour, the laterals smaller and paler. Legs aud 

 prologs orange. The pattern of the body is made up of longitudinal 

 bands of dittereut shades, the whole being sprinkled with minute black 

 dots; the shades of colour seeming to be dependent upon the numbers 

 and proximity of these dots to one another. The dorsal stripe is pale, 

 on each side of this is a darker stripe, aud then again a lighter stripe, 

 along the sides. Immediately behind the hump there is a slight trace of 

 the transverse band present in the last instar, but it is nearly washed out. 

 Ventrally, the larva is pinkish-grey with the spots dull brown. The lateral 

 fringe is slightly developed. In the 5th instar the larva measures aljout 

 2-5 in. It tapers slightly towards both head and anus, being broadest 

 at the 5th abdominal, which bears a very large hump. The ground 

 colour is yellowish-grey, powdered Avith numerous black dots, which 

 arrange themselves in longitudinal lines, but the latter are very uuk-Ii 

 broken up and interrupted. The head is orange-brown with an orange 

 streak down each lobe, the face being beautifully and finely reticulated 

 with black, and somewhat hairy. The thoracic and anterior abdominal 

 dorsal tubercles are small and yellow, the posterior dorsals larger, 

 orange-brown mottled with black. On the 8th abdominal segment 

 they are much enlarged, and form a kind of ridge pointing backwards. 

 There is a black streak on each side pointing forwards and downwards. 

 The lateral tubercles are small and yellow, the post-spiracular some- 

 what larger. The spiracles black. The hump on the 5th abdominal 

 is very large, orange-brown, and has on each side of it an orange mark, 

 spreading over the 6th abdominal, the whole forming a horse-shoe mark. 

 The lateral fringe is white and well developed. Ventrally the larva is 

 pale bluish green-grey, with a pink flush down the centre, each abdom- 

 inal segment bearing a large round spot ; these are especially large on 

 the 3rd, 4th, 5th aud 6th abdominal segments, which bear the prologs. 

 When full-fed, the larva spins a loose silken coeoon amongst the leaves 

 of its food-plant (willow or poplar), and changes to a purple-brown pupa 

 covered with bloom. 



The imagines measure about 2-5 to Sin. in expanse. The fore- 

 wings are pale yellowish-grey, with a dark smoky orbicular. Just 

 below the orljicular there is an oblong yellow spot, and on the basal 

 side of the orljicular a paler area, which extends across the wing, aud is 

 bounded by the basal line. There are two transverse zigzag bands, 

 one on each side of the orbicular, the one near the base being double, 

 the side nearest the base being pale yellow, the other side smoky ; the 

 other is between the orbicular and hind margin, this is also double, -the 

 side nearest the hind margin being distinctly paler, with a smoky 

 margin. The hind- wings are scarlet, with a very broad black marginal 

 band, which tapers a trifle towards the hind angle, but not nearly as 

 much as does that of 0. elocata. The inner band forms a sharp angle 

 about the centre of the wing, and is also indented at several points. 

 The fringe is white on the hind margin, smoky on the inner margin. 

 Beneath it is very similar to C. elocata, the bands are, however, 

 broader, the white being much less in proportion, the red on the hind- 



