yS Thomas Albert Williams 



brown color and having the tail concolorous with the abdomen. 

 Length of body, 1.75-2.00 mm. ; antennae, 2.90 mm. ; honey tubes, 

 0.40 mm. The species has affinities with Myzus. 

 No specimens in either collection. 



99. Siphonophora euphorbiae Thomas. 



Thomas, Bull. 111. St. Lab. Nat. Hist., 2, p. 6 (1878). 

 Thomas, /. c. Siphonophora euphorbicola. 



Apterous viviparous female: General color pale green. Antennae longer 

 than body; lower portion pale, apical portion dusky. Eyes black. Legs 

 pale. Tarsi dusky. Honey tubes pale with dusky tips. 



Winged viviparous female: General color bright green. Head and tho- 

 racic lobes brownish. Antennae considerably longer than body; black, 

 with pale base. Wings large, hyaline, with yellowish insertions and sub- 

 costal, prominent but slender oblique veins ; second branch of cubital aris- 

 ing nearer the apex of wing than to base of first branch; stigma dusky; 

 stigmal vein curved nearly or quite its entire length. Honey tubes long 

 and slender, dusky at tip, fully three times as long as the tail. Tail green, 

 upcurved. 



On spurge (Euphorbia hypericifolia). Ashland, October 9, 

 1889. Generally few in number and clustered on under side of 

 leaves and on flower stalks. It is very probable that both of 

 Thomas's species are the same thing. My specimens agree with 

 the descriptions of both species and though his description of 

 S. euphorbicola is the better one, having colors given, the specific 

 name euphorbiae must be used as it precedes the other in his 

 article. 



100. Siphonophora frigidae Oestlund. 

 Oestlund, List Aph. Minn., p. 20 (1886). 

 Oestlund, Syn. Aph. Minn., p. 83 (1887). 



Apterous viviparous female: Color shining dark green. Eyes black. 

 Antennae on large frontal tubercles, as long as the body, black, with base 

 of III paler; VII and III subequal in length. Beak reaching middle coxae, 

 blackish. Legs black, with bases of femora paler. Dorsum tuberculate, 

 hairy. Honey tubes imbricated, black. 



Winged viviparous female: Head and thorax black. Antennae about as 

 long as body, black, with base of III paler; III longer than VII, III and 

 IV with sensoria. Beak rather long. Abdomen shining dark green, with 

 a distinct metallic luster, hairy. Honey tubes black, imbricated, 0.50 mm. 

 long. Tail black, obtuse, hairy, 0.35 mm. long. Length of body 2.35 mm., 

 to tip of wings 4 mm. 



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