62 Thomas Albert Williams 



discoidal curved gradually for nearly its entire length ; cubitus obsolete 

 at base, second branch nearer the apex of the wing than to the first branch. 

 Stigma dusky brown, rather narrowly lanceolate, acute at both ends. 

 Stigmal vein with the last third nearly straight, the first two thirds rather 

 sharply curved. Abdomen green, with black marginal dots, a green trans- 

 verse band between and in front of the honey tubes, and darker bands 

 behind them. Honey tubes and tail black, the former 0.27 mm. long, the 

 latter about one third as long, club-shaped. Length of body about 1.73 

 mm., to tip of wings 3.25 mm. 



Found on the flower stalks of Yucca angustifolia, in very large 

 colonies, in both Sioux and Dawes counties, June to July, 1890. 



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

 97 > 9&> 99) and of the U. S. National Museum (no. 319). 



Genus Siphocoryne 

 yy. Siphocoryne pastinaceae (Linnaeus). 



Linnaeus, Syst. Nat., I, 2, p. 734 (1767). Aphis pastinaceae. 



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



Koch, Die Pflan., p. 41, figs. 52^54 (1854). Rhopalosiphum pastinaceae. 



Passerini, Gli afidi. (i860). Siphocoryne pastinaceae. 



Thomas, Ins. 111., 8th Rep., p. 84 (in part) (1879). Siphocoryne 



pastinaceae. 

 Buckton, Mon. Brit. Aph., II, p. 24, pi. XLIII, figs. 5-7 (1879). 



Siphocoryne pastinaceae. 

 Oestlund, List Aph. Minn., p. 36, 1886, Syn. Aph. Minn., p. 70 (1887). 

 Siphocoryne archangelicae. 

 Apterous viviparous female: Color yellowish green, except the tarsi and 

 tips of antennae, which are dusky. Eyes very dark red. Honey tubes 

 clavate, reaching beyond the tip of abdomen. Tail medium sized; both 

 honey tubes and tail green. 



Winged viviparous female: General color yellowish green. Head and 

 lobes of thorax black. Antennae black, paler at base; generally a little 

 more than half as long as the body; VII about two thirds III, the latter 

 very conspicuously tuberculate. Beak hardly reaching middle coxae. Pro- 

 thorax greenish brown with an anterior black stripe. Legs yellowish to 

 dusky, with darker tips and blackish tibiae. Abdomen yellowish green, 

 with a large dorsal spot and marginal dots of dark brown. Honey tubes 

 reaching to or beyond the tip of the abdomen, brown, clavate. Tail dusky, 

 or in some specimens greenish, medium sized. Wing insertions yellowish; 

 subcostal and stigma conspicuous, dusky. Stigmal vein rather sharply and 

 evenly curved. Length of body about 2.25 mm., to tip of wings about 

 4.20 mm. 



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