S44 



Pomona College Journal of Entomology 



liglitcr arras at articulations, k-ngtlis of articles: I, 0.18 mm.; II, 0.11 mm.; Ill, 

 l.I mm.; IV, 0.96 mm.; V, 0.8 mm.; VI, 1.6 mm. (.spur 1.4 mm.) ; total 4.75 mm. 

 Article III with about thirty larjrc circular sensoria (Figure 180a). Rosirum — ■ 

 Reaching to second cox;r, color of body with dark lip. I'rnthorax — Verj' narrow, 

 light green. Mesothorci.v — Light green witii iiuiseul.ir lobes pink or amber. Meta- 

 thorajr — Slightly dusky. Alxlomcn — Nearly globular in sha))e (many more so 

 than the drawing shows), lightly covered with fine, white ])owder. Cornicles — 

 (Figure 180 c). Cylindrical, longer than style, light green with apical one-third 

 dusky, length 0.88 nnn., width at base 0.08 mm. Legs — Long, slender and very 



Figure 179. Macrosiphum albifrons 



Adult winged and apterous females on fruit clusters of Lupinus all)ifrons. 

 Notice body form and the white powdery covering. 



hairy, coxae color of body; femora amber with apical half dark; tibiiae amber with 

 apical tip dark; tarsi dark. Wings — Hyaline. Primary — Length .').2 mm., 

 greatest width 1.7 nnn. ; costal vein narrow; subcostal broad emerging into stigma; 

 stigma long and narrow, length 1.4 mm., width 0.2 mm., basal half of stigmal vein 

 shar))ly curved with apical half slightly curved to tip; first and second discoidals 

 nearlv straight; third discoidal with first branch arising near base at a distance 

 from it of one-fourth from base to tip, second branch arising two-thirds distance 

 from base of first branch to tip of second branch, all veins and stigma greenish- 

 brown. Secondari/ — Length S.l mm., width 0..f) mm.; subcostal twice curved; first 

 discoidal arising one-fourth the distance and second discoidal arising one-lialf the 

 distance from the base to the tip of the subcostal. Sti/le — Ensiform, two-thirds as 

 long as the cornicles, green. 



