228 THE CANADIAN ENTOMOLOGIST 



average 0.174; VI, base, 0.113 to 0.139, average 0.125; VI, fila- 

 ment, 0.070 to 0.087, average 0.080; total average length 0.891 mm. 



Winged viviparous female: 



Head (PI. XVIII, fig. 52) and thorax dark brown to blackish. 

 Abdomen brown with a central longitudinal whitish yellow stripe. 

 Body very sparsely hairy, the tip of abdomen, including cauda and 

 anal plate, more noticeably hairy. Antennae shorter than body; 

 relative antennal lengths as in the apterous; segment III bearing 

 7 to 8 rather large circular sensoria in a row, the usual distal ones 

 on V and base VI (PI. XVIII, fig. 53). Wings hyaline, veins 

 narrow, an almost imperceptible duskiness at tips of veins; ter- 

 minal branch of media variable, sometimes branching near apex 

 of wing and sometimes nearer to the point where this vein first 

 branches. Cornicles whitish, slightly narrower at tip than at base, 

 about as long as broad and quite inconspicuous in mounted speci- 

 mens. Cauda broadly rounded and anal plate bilobed as in the 

 apterous form (PI. XVIII, fig. 54). 



Measurements frcm three specimens in balsam, the bodies 

 somewhat shrivelled. Average length of body 1.16 mm.; average 

 width 0.57 mm.; length of wings approximately three times their 

 width; antenna I, 0.06; II, 0.05; III, 0.261 to 0.295, average 

 0.278; IV, 0.156 to 0.174, average 0.165; V, 0.182 to 0.200, aver- 

 age 0.191; VI, base, average 0.122; VI, filament 0.078 to 0.096, 

 average 0.087; average total length 0.953 mm. 



Immature: 

 The young is whitish green with pale olive green markings, as 

 follows : A U-shaped marking the bottom of which extends to and 

 usually includes the first abdominal segment and the top of which 

 reaches the prothoracic segment. A longitudinal area on each side 

 of the abdomen and about in line with the cornicles, but not quite 

 reaching to them. Another marking just posterior to the cornicles. 

 Cornicles white as in the adult. 



Winged male: 

 Head and thorax dark brown to blackish. Abdomen pale 

 pea-green with a dorsal median longitudinal marking and an area 



