60 Thomas Albert Williams 



portion of tibiae paler. Honey tubes black, cylindrical, about equaling the 

 tarsi in length. Tail very short, conical, hairy, greenish yellow. Length 

 of body 2-2.30 mm., to tip of wings 3.50-3.80 mm. 



On under side of leaves of snowberry (Syphoricarpus race- 

 mosus var. pauciflorus) and Indian currant (S. vulgaris), causing 

 them to curl up and die. Generally most plentiful at the upper 

 ends of the branches. Often a whole clump of the bushes are to 

 be seen with the leaves twisted all out of shape by this species and 

 A. albipes Oest. Ashland, May, 1890; Elmwood, June; War 

 Bonnet Canyon, June, 1890. 



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

 93) and of the U. S. National Museum (nos. 315, 329). 



74. Aphis vernoniae Thomas. 



Thomas, Bull. St. Lab. Nat. Hist., No. 2, p. 10 (1878). 



Thomas, Ins. 111., 8th Rep., p. 97 (1879). 



Monell, Bull. U. S. Geol. Sur. Ter., V, No. 1, p. 23 (1879). 

 Apterous viviparous female: Color from green to yellowish. Antennae 

 light colored or brownish, only about one third the body in length. Eyes 

 black, rather large and prominent. Beak reaching to hind coxae. Honey 

 tubes pale, cylindrical, twice the size of the obtuse club-shaped tail and 

 longer than the tarsi. Tail yellowish. Legs pale, with dusky joints and 

 tarsi. Abdomen large and broad for the size of the insect. 



Winged viviparous female: General color yellow. Head and thoracic 

 lobes dusky. Antennae pale to dusky, about two thirds the body in length ; 

 IV, V and VI subequal. Eyes black. Abdomen all yellow. Honey tubes 

 yellowish, as in the apterous form, but longer. Tail pale or yellowish. 

 Legs as in apterous. There is one form with black thoracic lobes and 

 more or less of green on the abdomen. 



On leaves and flower stalks of ironweed (Vernonia fascicu- 

 lata). Lincoln, October 8, 1888; Weeping Water, October 10, 

 1888, and Ashland, October 2, 1889. 



Specimens in the collection of the University of Nebraska 

 (no. 94). 



75. Aphis viburni Scopoli. 



Scopoli, Ent. Cam. (1763). 



Kaltenbach, Mon. Pflan., p. 78 (1843). 



Koch, Die Pflan., p. 122, figs. 165, 166 (1854). 



Buckton, Mon. Brit. Aph., II, p. 77, pi. LXI (1879). 



Thomas, Ins. 111., 8th Rep., p. 96 (1879). 



144 



