The Aphididae of Nebraska Jj 



Apterous viviparous female: Pale green. Antennae on large frontal 

 tubercles; I, II and base of III pale, remainder black; III and VII sub- 

 equal in length. Eyes black. Beak reaching to hind coxae. Legs long, 

 with joints and tarsi blackish. Abdomen clear green. Honey tubes long 

 (0.96 mm.), curved, imbricated, dusky to black. Tail yellowish green, not 

 half the length of the honey tubes, hairy, acute. 



Winged viviparous female: General color as in apterous form. Head 

 and thorax of a darker, shining green. Antennae with more black than in 

 apterous, III with numerous very small, scattered sensoria, otherwise similar. 

 Beak as above. Legs black except the bases of femora. Wings hyaline, 

 delicate, oblique veins very slender; cubital obsolete at base. Stigma con- 

 spicuous, dusky, rather acute at both ends, angled at base of stigmal vein, 

 the latter sharply curved for two thirds its length, then nearly straight. 

 Length of body about 2.50 mm., to tip of wings 3.90 mm. Honey tubes 

 rather slenderer than in the apterous, imbricated, about 0.70 mm. long. 

 Tail slender, upcurved. 



On "cow tail" (Erigeron canadensis), in very large colonies. 

 Lincoln, October 2, 1888; Weeping Water, October 10, 1888. 



Specimens in the collection of the University of Nebraska (no. 

 136) and of the U. S. National Museum (no. 12). 

 98. Siphonophora eupatorii n. sp. 



Apterous viviparous female: General color greenish or reddish brown. 

 Antennae one and one half times as long as the body, brown to black. 

 Legs brownish, with black joints and tarsi. Honey tubes twice as long as 

 the tail ; both shining black. 



Winged viviparous female: Greenish to brown, head and lobes of thorax 

 olive brown. Antennae one and a half times the body, black. Beak reach- 

 ing hind coxae, black, with paler base and whitish rings at the articula- 

 tions. Legs black, except femora. Wings with yellowish insertions and 

 slender veins ; the second branch of cubital very near the apex of the wing 

 and in many specimens entirely wanting or represented by a thickening at 

 the end of the vein. Stigmal vein curved only at the base, then straight or 

 slightly recurved. The venation is very variable. Honey tubes and tail as 

 in apterous female. 



On white snakeroot (Eupatorium ageratoides), in company with 

 Aphis ageratoides Oestlund, October, 1889. Apterous females 

 and pupae of a Siphonophora very close to, if not identical with 

 the above, were collected September, 1890, on Eupatorium perfo- 

 liatuni at Ashland not far from the place where that species was 

 collected, differing only in being of a more uniformly greenish- 



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