—94— 



broad brownish line, broken by the segment joints. The two long pro- 

 jecting brushes on first segment and the less prominent ones on anal seg- 

 ment are black, while almost all the hair of the larva is of its own pale 

 color. All the hair is very soft and beautifully feathered in different 

 patterns. The joint between first and second segment has dorsally a slate- 

 colored patch. Dorsal warts on first segment have brown tips, those on 

 second and third are plain ; on fourth segment the dorsal warts bear dense, 

 even, slate-colored hair-tufts, these dark hairs being a little longer than 

 the light hair on adjoining warts. Warts on 5th, 6th and 7th segments 

 tipped with brown, on 8th segment whitish, on 9th, 10th, nth and 12th 

 segments the brown color prevailing. On 9th and on 10th segments, 

 between the dorsal warts, appears a small, pearl-like, yellowish-white ex- 

 crescence, which the larva is able to retract. — Having been fed only on 

 different species of Oak leaves before this, Wild Cherry, Beach and Birch 

 leaves Mere given, to all of which they took, but preferred Oak to all others. 



Second moult, August 22nd. Length, about ^ of an inch, when 

 crawling. Larvae look very different after this moult, most so on 4th and 

 nth segments, where on dorsal warts dense, brush-shaped, dark-brown 

 hair-tufts arise. The spreading whitish hair on sub-stigmatal warts very 

 much developed ; 9th, 10th and nth segments light brown. 



Third moult, August 27th. Growth of caterpillars comparatively very 

 slow; length, ^ ofan inch. Ground color dorsally and laterally dark 

 slate with narrow, subdorsal whitish line ; stigmatal area and underside 

 light olive-green. Hair on sub-stigmatal warts whitish ; on dorsal and 

 supra-stigmatal warts mouse-gray. The two projecting brushes on 1st 

 segment, a few long projecting hairs on anal ring, and dorsally on 4th and 

 nth segments a very dense hair-tuft, slightly overreaching the gray hair, 

 are of a deep, black color. From 4th to 8th segment the vestiture is 

 densest and richest. 



Fourth moult, September 1st. Length about j inch. Apppearance 

 of larvae very little changed. Underside olive-green, legs and pro-legs 

 lighter, also stigmatal area of a lighter shade. 



Fifth moult, September 5th. Length about f- of an inch. No material 

 change took place. Dorsal tufts on 5th and 6th segments and the front 

 of dorsal tufts on 7th segment profusely mixed with black hair, single 

 dark hairs interspersed on all tufts. After every moult the hair appears 

 richer and more feathery, giving the resting insect an almost rounded ap- 

 pearance. The larvae, when disturbed, roll themselves up. 



Sixth moult, September 10th. None of the caterpillars reaching one 

 inch in length (measured from head to anal segment always), but they 

 look almost £ inch wide with the fringe-like hair. 



Seventh moult, September 1 8th. The full grown larvae before pupating 



