19Z THE CANADIAN ENTOMOLOGIST. 



from back to iront midway between antenn?e, Wings hyaline. The first 

 anal and cubital veins quite distinct while the median with its two branches, 

 remains only as faint lines. The nectaries of this form are cone-shaped 

 with a flanged mouth and are apparently not placed as far forward as in 

 the earlier forms. Cauda short and broadly angular. 



Measurements : Length of body, 2.84 mm.; width, 1.09 mm.; length 

 of wing, 3.65 mm.; width, i.i mm.; total wing expanse, 8.08 mm. Length 

 of antennal segments, I, .66; II, .11; III, .44; IV, .154; V, .198; 

 VI, .11 ; spur, .045 mm.; total length, 1.123 mm. Length of nectaries, 

 .064 mm. Length of cauda, .22 mm. 



The fall migrant was not secured. 



■Egg-laying female. — Collected on terminal shoots of above plant, 

 Oct. 30, 1910, and Oct. 27, 191 1, along with the alate males. General 

 colour brownish with ash-grey powder on body, and with two more or less 

 regular stripes down the back ; and with a wide brown stripe extending 

 across the body from one nectary to the other. At the base and above 

 the Cauda another transverse band is usually present. Antennae and legs 

 except tips, light brown ; other parts dusky to black. Body robust and 

 with large semi-conical nectaries which are brown in colour. Antennae 

 and legs hairy ; antennae one-third the length of the body. 



Measurements: Length of body, 2.9 mm.; width, 1.7 mm. Length 

 of antennal segments, I, .066; II, .09; III, .35; IV, .176; V, .176; 

 VI, .11; total length, 1.013 mm. Length of nectaries, .06 mm., and 

 cauda, .35 mm. 



Alate male. — Collected on terminal shoots of host plant Oct. 30, 

 1910, and Oct. 27, 1911, about Corvallis, Oregon. 



General colour: Head and thorax black with green abdomen. 

 Abdomen with a series of black, transverse, more or less distinct, bands. 

 Antennae yellow at base, dusky at tip. Femora and tibiae dusky at middle 

 to black at ends ; tarsi black. Wings hyaline but with costa dark brown, 

 median vein and branches almost indistinct ; other veins dusky. Nectaries 

 slightly bell-shaped with a flanged opening. Third antennal segment about 

 equal in length to fourth and fifth segments and with about 30 to 39 visible 

 small circular sensoria. Fourth segment with 10 to 12 circular sensoria 

 which appear slightly larger than those on the third segment. Fifth with 

 about eight medium-sized, and one large, visible sensoria at the distal end. 

 Sixth segment with one large and apparently six small sensoria at base 

 of spur. 



