[FLETCHER & GIBSON] SOME SPECIES OF CANADIAN LEPIDOPTERA 69 
but these are not so conspicuous. Tubercles black and small. Spiracles 
inconspicuous. Anal flap margined at sides with white. Thoracic feet 
rather paler than body; prolegs concolorous; anal feet white at sides. 
Stage 111.—Length 10.5 mm. Head 1.0 to 1.1 mm. wide, dull 
black or very dark brown, with whitish markings as before; the two large 
white spots on either side of clypeus are now joined together. Body 
dark above, blacker on anterior half, and yellowish-brown on lower 
portion of sides and venter. The only semblance of the rings of white 
are on segments 5, 6, 7 and 8; in some specimens there are no white 
spots on segment 5. All the spots are on the dorsum, and on segments 6, 
7 and 8 still form a U. The longitudinal lines on body are as before, 
but those below the spiracles are faint and hardly visible owing to the 
lighter colour of the ventral surface. Spiracles small and black. 
Tubercles small and shiny black. The protuberances on the sides of 
segments 5-10 are black, those on segments 9 and 10 not so large as the 
others. Anal flap concolorous with dorsal surface, margined at sides 
with pale yellow. Thoracic feet and prolegs concolorous with venter, all 
bearing short hairs. 
Stage IV.—Length 15 mm. Head 1.6 mm. wide, whitish markings 
larger than before; whole front of face now nearly white. In general 
appearance the larvæ are much the same in this stage as in Stage III. 
On segment 6 alone is the white ring clearly visible and only appears 
on the dorsum as the U-shaped mark. In some specimens there are a 
few white dots on the dorsum of segments 7 and 8. The lines on body 
are faint, some being hardly traceable. The whole body is densely 
mottled with dark purplish, whitish and brownish spots and blotches. 
Spiracles black. Tubercles very small and black. The lateral pro- 
tuberances are now smaller and consequently not so conspicuous. On 
segment 11, in centre of dorsum is a double black wart-like elevation, 
on either side of which is a dark blackish band, reaching down to near 
the spiracle. Thoracic feet paler than ventral surface and rather trans- 
lucent; prolegs concolorous. 
Stage V.—Length 21 mm. Head 2.2 mm. wide, concolorous with 
body, flattened in front, slightly indented at vertex, markings much as 
in last stage. Body dark brown, colour varying slightly in the speci- 
mens. Dorsal stripe pale, indistinct, hardly traceable on thoracic and 
anal segments. Ventral lines present but rather indistinct. Lateral 
lines obsolete. On the dorsum beginning on segment 6 and ending on 
segment 11 there is a distinct series of pale reddish diamond shaped 
marks. The U-shaped mark is now only present on segment 6 (abdom- 
inal segment 2); whole body densely streaked and dotted with dark 
purple, white and brown as in last stage. Tubercles very small and 
