1915] The Aphid Tribe Pterocommini bol 
This species has never been collected by myself and it 
apparently does not occur on the Pacific Coast. For this reason 
color notes are taken from the original descriptions and the 
additional notes were made from specimens collected in Colorado 
and Maryland and mounted on slides. 
“Oviparous Female-——Body 3-5 mm. long by 2 wide across 
middle of abdomen; antennz 2-3 mm. long. 
‘General color dull, yellowish-brown, with a longitudinal 
row of indistinct black spots on each side of dorso meson; 
cornicles bright orange red, antennae dusky, except basal 
portion of third joint, which is yellowish brown; legs dusky, 
with basal portion of femora, and sometimes more or less of 
tibia, dark yellowish-brown. Body, legs, and antenne pilose; 
Joint III of antenne long, but shorter than IV plus V, which are 
subequal; VI and VII each rather long, the latter the longer of 
the two. Cornicles long for this genus; swollen in the middle. 
“The Egg—tLength, 1-2 mm.; oblong oval, coated with 
a thin gray substance like that on the egg of M. salicis; deposited 
on the bark, about the buds and axils, especially where the 
surface is roughened. Later he also describes what he believes 
to be the wingless male.”’ 
Apterous viviparous female: As a rule among the species 
of this group the apterous forms are almost exactly alike 
except in size and one would expect this form to resemble very 
closely in color markings, the oviparous female. Observations 
made from a slide containing several apparently apterous 
forms show the third antennal segment with about 14 round 
sensoria lying in a more or less regular line along the inside 
edge. In the alate form there are from 17 to 25 on the third 
segment. Along each side of the body may be found, one to 
each segment, a row of the thick short tubercles. Nectaries 
long and swollen, but sides tapering gradually and not suddenly 
bulged as in P. salicis. Opening at tip small and apparently 
without a flange. Entire body and legs covered with long 
hair. 
Measurements and Length of Body.—3.6 mm.; width 1.5 mm. 
Length of antennal segments, III, 0.75 mm.; IV, 0.51 mm:; 
V, 0.5 mm.; VI, 0.22 mm.; spur 0.28 mm. Total length 2.65 mm. 
Length of nectaries, 0.4 mm. 
