THE CANADIAN ENTOMOLOGIST. 233 



middle of the body; segment III longest, it being a half to three 

 fourths longer than VI filament; segments V and VI base with the 

 usual distal sensoria. Beak reaching to coxae of second pair of 

 legs. Legs pale with dusky joints, the tips of the tibiae and all of 

 the tarsi black. Cornicles pale with the tip dusky, slightly 

 swollen towards the tip and constricted just before the apex, and 

 noticably longer than the cornicles of A. brassicce. Cauda conical, 

 and dusky to blackish. 



Measurements, as follows (averages from six individuals) 

 Length of body 1.66 mm.; width 1.00 mm.; cornicle 0.226 mm. 

 cauda 0.140 mm.; antenna I, 0.080; II, 0.061; 111,0.399; IV, 0.202 

 V, 0.160; VI, base 0.122; VI, filament 0.287; total average length 

 1.311 mm. 



Pupa. 



Head dusky, remainder of body cream colour or with a faint 

 greenish tint, and covered with a slight whitish pulverulence, 

 excepting the shining areas which are covered with a noticeable 

 reticulation, and which are placed as follows — a row of oval or 

 transverse areas on each side of the median dorsal line and a row 

 of smaller and more circular ones laterad of these on each side, 

 about in line with the cornicles. 



Eyes black. Antennae pale dusky, the distal ends of segments 

 being more so, relative lengths of segments as in the winged 

 female. Wing pads blackish. Legs pale dusky with the joints, 

 distal end of tibiae and tarsus blackish. Cornicles dusky, paler at 

 middle, blackish at tips, and similar in shape to those of the 

 wingless female. 



Winged viviparous female. (Fig. 22). 



Head and thorax black. Abdomen pale apple green with a 

 tint of nile green and a row of three black spots on each aide 

 anterior to the cornicles; a row of small impressed dots on each 

 side dorsad of the larger spots; and in addition a few scattered 

 inconspicuous dusky markings on the dorsum, and the last three 

 segments with black transverse, dorsal median markings. 



Eyes black. Antennae black; almost reaching to base of 

 cornicles; segments III and VI filament subequal; segment III with 

 19 to 26 moderately tuberculate circular sensoria irregularly placed, 



