THE CANADIAN ENTOMOLOGIST. 193 



Measurements: Length of body, 2 mm.; width, .87 mm. Length of 

 wing, 3.87 mm.; width, 1.52 mm.; total expanse, 8.61 mm. Length of 

 antennal segments, I, .066 ; II, .11 ; III, .51 ; IV, .242 ; V, .3 ; VI, .154 ; 

 spur, .c66 mm.; total length, 1.448 mm. Length of nectaries, .045 mm.; 

 Cauda, . 176 mm. 



Females along tips of needles, depositing from 5 to 8 eggs. 



Lac/uuis occidentalis Davidson. 



Qi^iite abundant in spring and fall on the terminal shoots, where it 

 causes the undersides of the twigs to appear bluish or smoky. 



Stem-mother. — Collected on Abies gra?idis, near Corvallis, Oregon, 

 Marcli 18, 1 911. Gregarious individuals from just hatched to two-thirds 

 grown. Colour dark brown, body pruino?e. Head and legs black except 

 tibiae, which are dark brown. Body with four rows of spots on the abdo- 

 men, which resemble dried spots of some white crystalline substance. 

 The more mature specimens taken later are darker and have more of the 

 pruinose covering. The spots are more distinct, and the underside of the 

 body and the sides are white with this covering. 



Measurements : Adult females. Length of body, 3 mm ; width, 2 mm. 

 Length of antennal segments, I, .09 ; II, .09 ; III, .35; IV, .154; V, .198; 

 spur, .198 mm. Spur tapers into joint so that it is not distinct from 

 segment. Total length, 1.08 mm ; length of cauda, .27 mm. Nectaries 

 small, cone-shaped, with chitinous ring at opening. Body, antennae and 

 legs bearing long hairs. 



Spring migrant. — Found on twigs, on underside, and causing bluish 

 colour intermixed with white flocculent castings of Aphids, 



General colour; head black; rest of body dark green but whitish in 

 appearance from flocculence which covers body and legs. Legs and 

 antennœ light brown with dark joints, tarsi dark to black. Antennae 

 slender and apparently without sens^oria except one large one at the distal 

 end of the fifth segment. Third segment the longest and about equal to 

 four and five in length. Nectaries cone-shaped, placed on the side of the 

 body and much larger than those of the apterous forms. Fore wings with 

 the median vein and branches indistinct, present as a mere outline. Hind 

 wqngs with normal venation of two oblique veins. 



Measurements: Length of body, 2.1 mm.; widih, 0.9 mm. Length 

 antennal segments, I, .066 ; II, .09; III, .44; IV, .176; V, .22; \T and 



