144 The Ottawa Naturalist. [Jan. 



conspicuous, narrowly margined above with yellowish-green. 

 Horn black, like body washed with white. Spiracles very small, 

 dark, in a pale ring. Thoracic feet and proleg concolorous with 

 body. 



Three specimens moulted the second time on June 19. 



Stage III. — Length 1 7 mm. Head rounded, slightly bilobed. 

 Whole body pruinose, as though powdered with flour. Dorsal 

 vessel inconspicuous. Subdorsal stripe white, broadly mar- 

 gined above with clear green. Caudal horn nearly 2 mm. in 

 length, black, reddish at base, lined with black in front. Spir- 

 acles pale yellowish, inconspicuous.. Feet concolorous with 

 head. 



Two specimens passed third moult on June 2 1 . 



Stage IV. — Length 23 mm. i\lmost the same as Stage II L 

 Head 2.5 mm. wide. Body pale green thickly dotted with 

 white, pruinose as before — a bluish-glaucous shade. Dorsal 

 vessel hardly distinguisable. Subdorsal stripe clear white 

 bordered above with dark green, almost as wide as the white 

 stripe. Caudal horn 3 mm. long from front edge to tip, very 

 wide at base, the upper half black, the lower half about equally 

 divided in colours, yellowish-white at the base and above ringed 

 with orange; ornamented in front with a black rather oval- 

 shaped spot, the whole base of horn being broadly ringed with 

 black. On segments 5 to 13 inclusive is a medio- ventral series of 

 dark gray, almost black, elongated blotches, one in the middle of 

 each segment. Spiracles yellow, very narrowly ringed with 

 black. Feet paler than body. 



Larvae moulted for the fourth time on June 2 7 and 28. 



Stage V. — Length 35 mm. Head 3.8 mm. wide, rounded, 

 slightly bilobed, blackish-brown, clypeus rather paler; mouth 

 parts pale yellowish-white. Body l)lackish-brown, bearing in- 

 numerable small black dots, particularly on sides and dorsum. 

 A series of much larger subdorsal spots are also present on seg- 

 ments 3 to 11 inclusive. Midway between these latter spots 

 and the spiracles is a rather indistinct, broken, black band more 

 apparent on the middle and posterior segments. A rather in- 

 conspicuous dorsal stripe is also present. Spiracles bright and 

 conspicuous, yellow-ochre rimmed with black. Caudal horn 

 nuich reduced, now being a blunt wart-like elevation about 0.5 

 mm. high posteriorly, shining black in colour, the base bor- 

 dered with a bright ring of yellow and a wider ring of velvety 

 black. Thoracic feet and claspers of prolegs pale greenish. 



One larva in this stage which moulted at 10 a. rn. was green 

 rather densely dotted with black. The dorsal vessel was almost 

 obscure, but the subdorsal band was wide, even, and very 

 distinct. The head was green washed with black- Bv noon, 

 however, the specimen was blackish-brown. 



