222 THE CANADIAN ENTOMOLOGIST. 



Egg. — Similar to other eggs of this genus in colour and shape, 

 being dome-shaped; .815 mm. wide, .65 mm. high; appearing smooth 

 to naked eye, but under microscope distinctly pitted all over with 

 depressions of irregular shape. Colour pale honey-yellow when laid, 

 turning buff colour after two days and gradually becoming darker 

 through orange shades till a day before hatching when they appear 

 nearly black. Laid in clusters side by side, on under side of a leaf 

 in cofinement. First larva hatched June 14, leaving little of egg shell 

 except the base ; duration of egg stage 10 days. 



Stage I. — Length 2.25 mm nearly cylindrical, head slightly larger. 

 Head black, shining, cordate ; mouth-parts yellowish. Body whitish 

 btfore feeding turning greenish, with black tubercles from which arise 

 black and gray hairs. Legs black ; i)rolegs grayish. Fed readily on 

 common plantain ( Plant ago fuajor). 



Stage II. — Length 4.5 mm. Not much change noted in appear- 

 ance but colour darker with faint dorsal stripe. 



Stage III. — Length 7 mm. Head black, body cylindrical, blackish 

 with tufts of black and grayish hairs from the conspicuous black 

 tubercles. Segments 2, 3 and 4 pale orange with black spots, 11 and 12 

 similar. A pale yellowish dorsal band from segment 5 to 10. 



Stage IV. — Length 11 ram. Head black, mouth parts yellowish; 

 body black with longitudinal stripes yellow, hairs black ; legs and 

 prolegs black. 



Stage V. — Length 20 mm. No further notes taken. 



Stage VI — Mature larva (description by Mr. Arthur Gibson) 

 '•Length 38 mm. at rest, 45 mm. extended. Head 2.8 mm. wide, 

 rounded, somewhat quadrate, conspicuously depressed at vertex, flattened 

 in front, median suture pale, sel^e dark brown, long and slender. Skin 

 of body streaked and blotched with dark reddish brown. Dorsal stripe 

 chrome-yellow, conspicuous, distinct on all segments, wider on abdominal 

 ones. Tubercles jet black, each with a bunch of radiating stiff, barbed 

 bristles mostly of uniform length. . Tubercle I about one half size of 

 H; H larger than HI; IV, V, VI, elongated. Bristles from tubercle 

 I mostly silvery with a few black ones intermingled ; from II, III and 

 IV silvery and black in about equal numbers ; from V and VI mostly 

 silvery. Tubercle VII larger than VIII, bristles from ihese mostly 

 b'ack and short. An indefinite, broken yellow lateral line is also 

 present, most apparent along upper edge of tubercle III. Spiracles 



