54 Thomas Albert Williams 



but was unable to secure any winged specimens. Oestlund men- 

 tions finding A. setariae (Thomas) on this plant, but I think that 

 it was very likely this species. 



Cotypes in the collection of the University of Nebraska (nos. 

 81, 82) and of the U. S. National Museum (no. 101). 



65. Aphis pentstemonis n>. sp. 



Apterous form: Green, with scarcely any darker markings. 



Winged form: General color green. Antennae all black or sometimes 

 with slightly paler bases on inconspicuous tubercles; III longest. Head 

 black, rather pointed in front ; eyes red, with black tubercle. Neck green. 

 Prothorax brown, with slender lateral tubercles. Thorax with black lobes 

 and green membrane. Wings with slender brownish veins ; cubitus with 

 second branch nearer to the apex of the wing than to the first branch; 

 first and second discoidals nearly straight; stigmal vein curved for its 

 entire length. Stigma rather broadly lanceolate, generally obtuse, or short 

 pointed at the outer end. Legs dusky, the hind pair frequently almost 

 black; joints and tarsi black. Abdomen green, with three or four large 

 marginal spots on each side and a row of impressed dots just within these; 

 a brown spot at the base of each honey tube and transverse bands behind 

 these. Some specimens have a few irregular bands on front part of the 

 abdomen, while in some these are wanting and the other dark markings 

 are not so noticeable. Honey tubes one and one half to two times as long 

 as the tarsi, black. Tail one half the honey tubes, rather sharply conical, 

 black. Length of body 2.20 mm., to tip of wings 3.75 mm. 



Found on Pcntstemon glaber, clustering along the flower spikes, 

 stems and leaves. What is evidently the same species was found 

 on Musenium tenaifolium, growing near the Pcntstemon. War 

 Bonnet Canyon, June 23, 1890. 



Cotypes in the collection of the University of Nebraska (nos. 

 83, 84) and of the U. S. National Museum (no. 102). 



66. Aphis rumicis Linnaeus. 



Linnaeus, Syst. Nat., I, 2, p. 734 (1746). 

 Fabricius, Ent. Syst., IV, p. 213 (1794). 

 Kaltenbach, Mon. Pflan., p. 81 (1843). 

 Koch, Die Pflan., p. 140, figs. 190, 191 (1854). 

 Buckton, Mon. Brit. Aph., II, p. 81, pi. LXIII, LXIV (1879). 

 Thomas, Ins. Ill, 8th Rep, p. 88 (1879). 

 Oestlund, Syn. Aph. Minn, p. 61 (1887). 

 Apterous viviparous female: Color varying from green to brownish. 



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