THE CANADIAN ENTOMOLOGIST 



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ing nearly to or quite to the 3rd coxa-. Cornicles rather short, black 

 to deep brown; imbricated, cylindrical, or slightly expanding at 

 the base, a few constricted at the apex and base. Cauda black 

 or brown, blunt, with two pairs of lateral hairs. Legs black, except 

 the base of the femora, which are yellowish. Base of wings yellow- 

 ish; stigma and veins greyish brown to brown. 

 Length — 1.8 to 2 mm. 



Apterous viviparous female. 



Deep greyish green to almost black, with much mealy covering, 

 and, when denuded of this, the insect is somewhat shiny. Antennae 



Fig. 8. — Oviparous females of Apple Aphides. A, Aphis pomi: a. hind tibia. B, A,koehii; 

 b. hind tibia. C, Siphocoryne avenae; c, hind tibia. 



shorter than the body, base paler than the rest, composed in all 

 the specimens I have seen of 5 segments only; the 3rd very long; 

 the 4th less than half its length; the 5th with a short flagellum. 

 Eyes deep brown to black. Proboscis greenish, apical half almost 

 black, reaching to the second pair of legs. Venter deep greenish. 

 Cauda black to brown. Cornicles short, black; in some the base is 

 reddish yellow. Legs black. 



Length — 2 mm. 



Nymph. — Two forms occur, one pale to deep green, mealy, 



