THE CANADIAN ENTOMOLOGIST 



167 



Winged viviparous female. 



(PI. VII, figs. 35-39). 



Head dark brown. Antenna? black, excepting basal half of I 

 and ring at extreme base of III, which parts are pale, and some- 

 times all of I and II are pale dusky; segment VII the longest; not 

 reaching to tip of body; 2 to 10 circular sensoria in a row, usually 

 near base, on segment III, and the usual distal ones on V and base 

 of VI. Eyes reddish black, ocelli black. Beak barely reaching to 

 coxae of the second pair of legs. Thoracic plates shining dark 

 brown. Wing veins blackish and conspicuous, the venation as 

 illustrated. Legs with femora pale, excepting the hind pair, which 

 are dusky to black; the tibiae and tarsi black. Abdomen usually 

 brownish yellow, but sometimes with a distinct pale green tint, 

 and bearing three dusky spots on each side anterior to the cornicles; 

 also the dorsum of each segment with a more or less distinct dusky 

 transverse band. Cornicles black, a little longer than segment IV 

 of the antennae, and reaching about to tip of cauda, clavate in 

 shape. Cauda pale greenish yellow, semi-ensiform and sparsely hairy. 



Measurements, taken from 10 specimens mounted in balsam, 

 as follows: Length of body, not including cauda, 1.35 to 1.74 mm., 

 average 1.51 mm.; length of body to tip of cauda 1.47 to 1.90 mm., 

 average 1.64 mm.; width of body 0.55 to 0.74 mm., average 0.65 

 mm.; length of wing 2.40 to 2.94 mm., average 2.67 mm.; width of 

 wing 0.85 to 1.08 mm., average 0.93 mm.; cornicles 0.33 to 0.38 

 mm., average 0.35 mm; cauda 0.156 to 0.191 mm., average 0.173 

 mm. Antennal measurements as follows: 



