176 THE CANADIAN ENTOMOLOGIST. 



sides with a large angular or V-shaped black spot, the anterior 

 limb of which is oblique, the posterior limb transverse. Venter 

 pale with a dark ventral spot, more or less whitish-pruinose. 



Segment 2 blue with a very broad oblong black patch on 

 each side, their truncate anterior ends narrowly separated from, 

 or united with, a black spot in the antero-ventral angle, their 

 posterior ends connected across the dorsum, behind middle of 

 segment, by a narrower black band, and prolonged ventro-caudad 

 into a narrow streak which joins the apical transverse black band. 

 Accessory genitalia piceous, the anterior hamuli with pallid mar- 

 gins. 



Segment 3 blue; a long black streak on each side, close to the 

 tergal margin, extending cephalad nearly to the base and united 

 behind across dorsum by a basal black band, which is prolonged 

 cephalad on the median line into a slender tapering streak. There 

 is a black spot at the antero-ventral angle and a blue spot close 

 to the postero-ventral angle. Venter black. 



Segment 4: The black distal area covers about three-fifths 

 of the segment, separated from the tergal margin by a narrow 

 pale streak and prolonged cephalad on each side into a tapering 

 submarginal streak which nearly reaches base of segment. There 

 is a black dot near the antero-ventral angle and a small blue spot 

 at the postero-ventral angle. Venter black. 



Segments 5 and 6 black, the blue reduced to a basal ring 

 occupying two-sevenths (seg. 5) or one-fifth (seg. 6) of the dorsum, 

 and a lateral margin, in which broken indications of a black lateral 

 streak may be present; a black dot at the antero-ventral angle. 

 Venter black. 



Segment 7 black with a narrow basal and a broader apical 

 blue ring connected by a rather broad marginal band, which 

 generally encloses an irregular black streak, though the latter 

 may be united with the l:)lack of the dorsum. 



Segments 8 and 9 blue, each with a black lateral dot: 

 segment 9 also with a pair of black dorsal, dots. 



Segment 10 black al)ove, blue beneath and on the sides. 



Wings — Postcubitals of front- wings 10, sometimes 9; of hind- 

 wing 8, occasionalh' 9. Mj in front-wing arising opposite the 



