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Pomona College Jovrnal of Entomology 



lighter areas at articulations, lengths of articles: I, 0.18 mm.; II, 0.11 mm.; Ill, 

 1.1 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 large circular sensoria (Figure 180 a). Rostrum — 

 Reaching to second coxse, color of body with dark tip. Prothorax — Very narrow, 

 light green. Mesothorax — Light green with muscular lobes pink or amber. Meta- 

 thorax — Slightly dusky. Abdomen — Nearly globular in shape (many more so 

 than the drawing shows), liglitly covered with fine, white powder. Cornicles — 

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

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



Figure 179. Macrosiphum albifrons 



.•Xciiilt winded and aptertnis females on fruit clusters of Lupinus albifrons. 

 Notice body form and tlic white powdery covering. 



hairy, coxse color of body; femora .-inibcr with apical half dark; tibiae amber with 

 apical tip dark; tarsi dark. Jfings — Hyaline. Primary — Length ,'5. 2 mm., 

 greatest width 1.7 mm.; 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 

 sharply curved with apical lialf slightly curved to tip; first and second discoidals 

 nearly straight; third discoidal with first branch afising 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. Secondarij — Length .S.4 nmi., width O.f) mm.; subcostal twice curved; first 

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

 distance from the base to the tip of the subcostal. Sti/le — Ensiforni. two-tliirds as 

 long as the cornicles, green. 



