. The Canadian entomologist. Insects; Entomology. THE CANADIAN ENTOMOLOGIST 229 Antennae reaching to or beyond tip of abdomen; segment III with 4 to 8, usually 5, round sensoria, and segments V and VI with the usual ones; filament of VI quite long, being more than half longer than III and seven times the length of VI base (fig. 2a). Beak reaching almost to coxa? of third pair of legs. Cornicles (fig. 2b) of moderate length, being approximately half the length of antennal segment III, cylindrical, and flaring at the tip. Cauda (fig. 2c) broadly rounded and scarcely visible. Wing veins dark brow
. The Canadian entomologist. Insects; Entomology. THE CANADIAN ENTOMOLOGIST 229 Antennae reaching to or beyond tip of abdomen; segment III with 4 to 8, usually 5, round sensoria, and segments V and VI with the usual ones; filament of VI quite long, being more than half longer than III and seven times the length of VI base (fig. 2a). Beak reaching almost to coxa? of third pair of legs. Cornicles (fig. 2b) of moderate length, being approximately half the length of antennal segment III, cylindrical, and flaring at the tip. Cauda (fig. 2c) broadly rounded and scarcely visible. Wing veins dark brown, the second branch of discoidal branching about V2 the distance from tip to where first branches,. C Fig. 27.—Aphis rociadx Ckll. A, antenna; B, cornicle; and C, cauda, of winged viviparous female. Wingless viviparous female: Entire body very dark shining brown, ap- parently black, excepting posterior end of abdomen which is of a slightly lighter brown. Antennae apparently black excepting segment III, which is brownish. Legs as in winged female. Cornicles pale brown and black at tip. Cauda not apparent. The antennae similar to those of the winged female, except that they lack sensoria on segment III. Cornicles moderately short and cauda not exposed, but visible as a broadly rounded organ through the transparent body wall when mounted in balsam. Since writing the above I have received from J. R. Parker sexes of what I believe may be this species, collected in Montana on larkspur. The males are winged and the noticeable differences from the winged viviparous female are as follows: Antennal segment VI, filament longer than III, but not one-half longer; segment III with 60 or 70 small, somewhat tuberculate sensoria, irregu- larly placed; IV with 12 or 15, and V with 10 similar sensoria; cornicles less prominent, being paler and less conspicuously shaped. The apterous oviparous female differs from the apterous viviparous as follows: Antennal segment VI filament, longer than III
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