42 Thomas Albert Williams 



49. Aphis euphorbiae Kaltenbach. 



Kaltenbach, Mon. Pflan., p. 94 (1843). 

 Koch, Die Pflan., p. 89, figs. 119, 120 (1854). 



Apterous viviparous female: Broadly ovate, general color dark bluish 

 black ; thickly pulverulent. Antennae reaching nearly to base of honey 

 tubes, pale yellowish. Eyes black. Prothoracic and thoracic segments well 

 defined, the former with lateral tubercles. Abdomen arched. Legs pale 

 yellowish. Honey tubes and tail subequal in length, both dusky to black. 



Pupa: Rather larger; legs and antennae rather dusky. Thorax and wing- 

 pads almost white, with pulverulence. Otherwise similar to female. 



Winged viviparous female: General color much as in the apterous female 

 but with less pulverulence and head and thorax shining black. Prothorax 

 with lateral tubercles. Antennae and legs pale, or sometimes more or less 

 dusky. Wings with yellowish insertions, subcostal and stigma, the latter 

 angled at the ends ; second branch of cubital arising much nearer the apex 

 of wing than to first branch. Abdomen carinate ; dorsum with transverse 

 rows of impressed pits. Honey tubes slender, 0.20 mm. long, dusky to 

 black. Tail fully as long as honey tubes and generally lighter colored. 

 Anal plates blackish. Length of body 2.10 mm., to tip of wings 3.70 mm. 



On upper leaves and flower stalks of common spurge or milk- 

 weed (Euphorbia corollata). Weeping Water, August 22, 1890. 

 Easily distinguished by its dark color and white pulverulence. 



Specimens in collection of the University of Nebraska (nos. 60, 

 61) and of the U. S. National Museum (no. 67). 



50. Aphis frangulae Kaltenbach. 



Kaltenbach, Mon. Pflan., p. 64 (1843). A. rhamni. 



Koch, Die Pflan., p. 119, figs. 161, 162 (1854). A. rhamni. 



Koch, /. c, p. 142, figs. 192, 193. A. frangulae. 

 Apterous viviparous female: Size small, general color yellowish green to 

 dark olive green, with two or three darker green stripes on the dorsum, 

 which run together more or less. Eyes dark red. Antennae about two 

 thirds as long as the body, yellowish, with dusky tips. Prothoracic seg- 

 ments with prominent lateral tubercles. Honey tubes hardly as long as 

 the tarsi, pale yellowish to dusky. Tail almost as long as honey tubes, 

 obtuse, yellowish to dusky. Legs yellowish with dusky tarsi. Length of 

 body 0.90-1.20 mm. 



Winged viviparous female: Rather smaller than apterous female. Head 

 and thoracic lobes black. Antennae black, with part of III and IV pale; 

 shorter than body. Prothorax with lateral tubercles. Beak reaching middle 

 coxae. Legs rather short, yellowish, with tips of femora and tibiae and 

 tarsi blackish. Wings delicate, hyaline, with yellowish insertions, subcostal 



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