352 Annals Entomological Society of America [Vol. VIII, 
Alate viviparous female: Body large, broadly ovate,antenne 
reaching the center of the abdomen. Antenne rather slender 
and with the third segment bearing from 17 to 25 round sensoria 
along the inner side. Wings normal, veins clear. Abdomen 
probably with dentate tubercles on sides, but not visable 
on specimens at hand. Nectaries of shape indicated in drawings. 
Measurements: Length of body, 3.28 mm.; width across 
abdomen, 1.5 mm. Length of antennal segments, III, 0.79 
mm.:1V,0.51 mm::;V, 0.62 mm.; VI, 0.26 mm.; spur, 0:43 mm: 
Length of nectaries, 0.4 mm. Length of wing, 4.64 mm. 
Pterocomma bicolor (Oestlund). 
Synonomy: 
Melanoxanthus bicolor (Oestlund). 
Melanoxanthus bicolor (Oest.) Weed. 
Melanoxanthus saiicis (Linn.) Weed. 
Melanoxanthus salicis (Linn) Packard. 
Melanoxanthus salicis (Linn) Osborn. 
Melanoxanthus salicis (Linn) Weed. 
Melanoxanthus salicis (Linn) Cowen. 
Melanoxantherium salicis (Linn) Gillette. 
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In America there are two types of nectaries among the 
‘specimens designated as Melanoxantherium salicis Linn. One 
of these, as indicated in the accompanying drawings, the writer 
considers to be the one above indicated. For lack of proper 
evidence in rearing specimens the writer also considers the 
other type indicated as being a form of this species. However, 
later investigations may show the two to be from separate 
species. Certainly it is not Aphis salicis of Linn. for the writer 
has nineteen specimens of this group from France and Russia 
labeled Melanoxanthus salicis Linn. and the nectaries are 
quite distinct from any found on specimens collected in this 
country. It would seem then that the species Pterocomma 
salicis Linn. does not occur in America and the one or more 
species so determined are something else. 
Alate viviparous female: General color, brownish, tinged 
with yellow. Antenne with first two segments and the distal 
portions of 3 and 4, opaque, bases of third and fourth lighter 
with a yellowish tinge, fifth and sixth segments black. Head 
and thorax shining dark brown. Abdomen reddish brown 
with the dorsal lobes with dusky patches and a light brown 
median line on the dorsum. Legs yellow at the base of each 
part and dusky towards the ends, tarsi black. Nectaries 
