The Aphididae of Nebraska 23 



spots. Antennae hardly one third the body in length; two basal joints, 

 dusky; III, IV and V yellowish white, with dusky to black tips; VI short, 

 thick and bead-like, black; claw short, the transition scarcely distinguish- 

 able. Eyes dark red. Legs with bases of femora and a broad ring on 

 each tibia, yellowish white, rest black; hind legs long, the rest moderately 

 so. Beak very long, reaching almost to the tip of the abdomen in some 

 specimens. Abdomen with blackish brown marginal spots, three rows of 

 impressed black dots on each side and a larger double row on the median 

 line, the two posterior pairs of which run together, forming two larger 

 transversely elongated spots behind the honey tubes. Honey tubes con- 

 spicuous, dark brown, broadly conical, with a thickened rim. Length of 

 body about 4 mm., of beak about 2.40 mm. The body somewhat hairy; 

 legs, antennae and apex of abdomen especially so. Tail very broadly 

 conical, brown. 



Winged viviparous female: Head and thorax black. Prothorax brown- 

 ish. Antennae hardly reaching the posterior margin of the thorax, the 

 two basal joints dark brown with whitish ring at apex; VI black, the rest 

 with the larger basal portion and the tips yellowish white; III somewhat 

 longer than IV and V taken together; V longer than IV; all the joints 

 covered with slight raised places from which proceed long hairs. Eyes 

 dark red. Beak reaching to or often beyond the middle of the abdomen, 

 black pointed. Legs much as in apterous form, except that the front 

 femora are nearly or quite black and the rest of the legs have generally 

 much more black (sometimes the front tibiae are all black). Wings deli- 

 cate, pointed, hardly as long as is common in this genus, costal and sub- 

 costal heavy, dark brown ; discoidals slender, the cubital being at times 

 almost subobsolete. Stigma long, brown, shape typical of the genus. 

 Stigmal vein almost straight. Abdomen with two brown spots at the base, 

 one on each side of the median line; paler than in the apterous form, 

 many of the brown markings being represented only by a brownish stain; 

 impressed dots and honey tubes as in the apterous form, the segment pre- 

 ceding the tail with a transverse row of five bristles arising from spots 

 each side of the median line and the preceding segment with smaller bris- 

 tles similarly placed. Tail short, broad and rounded, bordered with brown. 

 Apical segment and anal plates dark brown, the former hairy. Eacli 

 side of abdomen with a row of about 7 small tubercles. Length of body 

 about 4.05 mm., to tip of wings about 5.15 mm. 



Winged male: Similar to the above in color and markings, the abdom- 

 inal markings rather paler. The wings are more slender and pointed. 

 Beak reaching beyond the tip of the abdomen, with a long, acute black 

 tip. Length of body 2.70 mm., to tip of wings 5 mm., beak 2.60 mm. 



The abdomen and thorax in all forms is marked with large marginal 

 and dorsal blotches of white pulverulence. This together with the banded 

 legs gives the insect a very pretty variegated appearance. 



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