138 THE CANADIAN ENTOMOLOGIST. 



black dots encircled with white. Duration of this stage about seven days. 

 At this period, the larva was observed to use all its legs in walking ; but the 

 exact period when this power was acquired was not noted. 



After Fifth Moult. — The body now appears green. A row of 

 white spots, one on each segment, above the interrupted subdorsal line. 

 Duration about seven days. 



After Sixth Moult. — Head rounded and smooth, slightly depressed 

 at the vertex, partly withdrawn beneath the skin of joint 2. Pale-whitish, 

 mouth-parts darker. Body semi-transparent whitish-green ; a lateral white 

 line edged with blackish above. On each segment to the twelfth, an 

 oblique blackish shade, running back from the base upward, and termin- 

 ating in a white point on the next segment, these points forming a sub- 

 dorsal row. The two points on joint 1 2 are nearer together and larger 

 than the others. Joint 12 is thickened and larger than the other segments. 

 There is an interrupted dorsal blackish shade with white points. Body 

 furnished with thin, fine, short, whitish hairs. Duration of this stage 

 seven days. 



After Seventh Moult. — Mature larva. Similar to the preceding. 

 Head slightly shaded with blackish above. The dorsal line appears as 

 traces of a white dorsal stripe, edged with blackish on both sides, occur- 

 ing in the fold between the segments. The color of the body is a darker, 

 more velvety green, less transparent, but whitish beneath. There is a 

 row of small whitish dots, one on each joint, above the spiracles, and 

 another similar row between the dorsal and sub-dorsal lines. Each dot 

 of both rows furnishes a short whitish hair. The two spots on joint 12 

 are quite conspicuous. Spiracles black. The larva rests with its body 

 bent near the middle, forming a loop, the head touching the last segment. 

 It feeds mostly at night. Length about 23 m.m. Duration of this stage 

 about eleven days. 



Pupation occurs in a very slight cocoon beneath the surface of the 

 ground. There appear to be two broods annually, the winter being 

 passed in the pupa state. This insect is common to America and Europe, 

 according to Dr. Speyer.* Humphreys and \Vestwood give a figure of 

 the mature larva,t and the same stage has been described by Edwards 

 and Elliot. J 



* Entomologische Zeitung, Stettin, Vol. XXXVI., page 153. 

 t British Moths, Vol. I., plate 35, figure 5. 

 JPapilio, Vol. III., page 133. 



