3 94 
Aphis helianthi. Monell. 
<£ Wingless individuals : Varying from pale green to dark green, with 
various irregular and varable darker shadings on the abdomen, the 
most constant and conspicuous of which is a dark green transverse 
band on the segment above the nectaries. Nectaries dusky; style, at 
least the apical two-thirds, pale dusky. 
Winged individuals— Head and thorax jet black; abdomen green, 
with a transverse band on the segment above the nectaries, and oc- 
casionaly with some darker spots on the margin. Antennae two-thirds 
as Jong as the body, entirely black; third joint as long as the preced¬ 
ing taken together; fourth and fifth joints subequal. Nectaries sub- 
cylindric, pale dusky, hardly reaching the base of the style, and less 
than twice the length of the tarsi. Wings hyaline, venation normal 
Length 1.77 mm; to tip of wings 3.04-3.29 mm. 
On the stems and leaves of Ilelianthus, St. Louis Mo.” 
Rhopalosiphum salicis. Monell. 
“ Winged indiuiduals— Head and thorax dusky; abdomen green, with 
•ious irregular, darker green markings. Antenme about half as long 
the body, not mounted on frontal tubercle; the third and fourth joints 
somewhat dentate; apical joint half as long again as the preceding; third 
and fourth joints often subconnate. Nectaries light green, reaching 
to the tip; the basal portion slender, expanding at the middle to 
twice its former diameter, and again suddenly contracted at the 
mouth, which is furnished with the usual annulus. Tail yellowish^ 
about one-third as long as the nectaries. 
Length 1.52 mm; to tip of wings 3.04 mm. Apterous individuals 
entirelv pale green, with two darker dorsal vittse. 
. L , .7 Cl ’ _J Cl Z. . . 
On the under side of leaves of Salix lucida , S. nigra and A baby- 
n m 
•i 
lonicay 
Rhopalosiphum hhois. Monell. 
“ Winc/ed individuals —Antennae a little longer than the body, mount- 
