52 Thomas Albert Williams 



rod (Solidago canadensis), Lincoln, October, 1888. On under- 

 ground stems of naked broom rape, August 6, 1889, at Alliance 

 (J. G. Smith). The Alliance specimens are larger than those on 

 the composites, being about 1.9 mm. long; they also have VII 

 subequal to or slightly longer than III. 



62. Aphis mimuli Oestlund. 



Oestlund, Syn. Aph. Minn., p. 57 (1887). 



Apterous viviparous female: Light green or occasionally becoming 

 darker green or the darker green arranged in longitudinal bands on the 

 dorsum. 



Winged viviparous female: General color green. Head and thorax dark 

 brown to black. Antennae pale, with blackish tips; III-V with sensoria; 



III equal to VII ; IV and V subequal ; VI three fourths of V. Beak 

 reaching hind coxae. Legs pale, with black femoral and tibial tips and 

 tarsi. Neck and prothorax green, the latter with very slender lateral 

 tubercles. Wings delicate, with slender brownish veins: stigma pointed, 

 dusky ; stigmal vein curved its entire length ; second branch of cubital 

 nearer the apex of the wing than to base of first branch. Abdomen pale 

 green, generally with a longitudinal dorsal stripe of darker green. Honey 

 tubes rather longer than the tarsi, green. Tail slightly shorter than honey 

 tubes, conical, green. Length of body 1.15 to 1.20 mm., to tip of wings 

 about 1.66 mm. 



Found on stems, branches, flower stalks and leaves of monkey 

 flower (Mimulus ringens), causing the leaves to curl up. Fre- 

 mont, July 31, 1890. 



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

 76, 77) and of the U. S. National Museum (no. 94). 



63. Aphis oenotherae Oestlund. 

 Oestlund, Syn. Aph. Minn., p. 69 (1887). 



Apterous viviparous female: Color from light pea green to dark green. 

 Tarsi and tips of antennae dusky. Eyes black. 



Pupa: Green. Tarsi, tips of antennae, wing-pads and tip of beak dusky. 



Winged viviparous female: Head and thorax black. Antennae about 

 two thirds the length of the body, black, generally with paler bases; III, 



IV and sometimes V with sensoria; III and VII subequal; all the joints 

 more or less minutely annulate. Beak of medium length. Prothorax 

 with lateral tubercles, green or in many specimens with a more or less 

 distinct transverse brownish band. Abdomen bright green, with a mar- 

 ginal row of brown or black spots and in many specimens more or less 

 distinct transverse brownish bands, especially on the segments behind the 



136 



