The Aphididae of Nebraska 57 



and dusky. The wings have a brownish tint. Honey tubes rather shorter 

 than in apterous form. Tail short and broadly conical, hairy. Antennal 

 tubercles less distinct than in apterous form. Length of body generally a 

 little less than that of apterous individuals and outline narrower. 



Among the flowers of hemp {Cannabis saliva) . Weeping 

 Water, October 10, 1888. This cannot be Phorodon cannabis 

 Pass., as that species has porrect frontal tubercles and is of a 

 much paler color. 



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



87) and of the U. S. National Museum (no. 108). 



70. Aphis senecionis n. sp. 



Apterous viviparous female: Dark olive green. Legs dusky to blackish 

 brown, with black joints and tarsi. Antennae not half the body in length. 

 Abdomen with a row of impressed dots on each side. Honey tubes dusky 

 brown. 



Pupa: Lighter green, with blackish wing-pads; legs, antennae and honey 

 tubes dusky. 



Winged viviparous female: Antennae but little more than half the body 

 in length ; dusky to black ; III longest, twice VII, which is only about one 

 and one half times VI. Head blackish. Eyes black. Neck and prothorax 

 green, the latter with very small lateral tubercles. Thorax black. Wings 

 with very slender brownish veins ; cubitus obsolete at base ; second branch 

 nearer to apex of wing than to first branch. Stigma rather short and 

 broad, dusky, obtuse at outer end. Legs all black but bases of femora. 

 Abdomen green, with impressed marginal dots and the general color of 

 the margins of a darker green. Honey tubes short, about the length of 

 the tarsi, black. Tail nearly as long as the honey tubes, dusky, black. 

 Length of body 1.50 mm., to tip of wings 2.95 mm. 



This species has the seventh joint of the antennae the shortest 

 of any with which I am acquainted. On upper part of stem, 

 leaves and flower stalks of Senecio canus. War Bonnet Canyon, 

 June 20, 1890. It is so plentiful at times as to cover nearly the 

 entire plant. 



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



88) and of the U. S. National Museum (no. no). 



71. Aphis setariae (Thomas). 



Thomas, Bull. 111. Lab. Nat. Hist., 2, p. 5 (1878). Siphonophora 



setariae. 

 Thomas, Ins. 111., 8th Rep., pp. 56, 192 (1879). Siphonophora setariae. 



141 



