AFHIDID/H OF SOUTHERN CALIFORNIA Ml 



E. O. CI8I(> 

 HORTICULTURAL COMMISSION EH OK VKNTURA COUNTY 



These descriptions and drawings were iii)v(l<- fri>iii fresh speeiineiis, either 

 living or ininu-diatelv after tliey were killed. I did this in order to make the 

 color notes as complete and exact as possible and to get the exact shape and 

 proportions of each insect as it really a])pears before being mounted. All of thi- 

 drawings were made with a camera lucida and no pains were spared to make them 

 correct in the minutest det/iil. 



In determining these species I have sought freely the .lid of the older workem 

 and best authorities on this group. I wish especially to acknowledge the valuable 

 help of Mr. J. T. Monell, Mr. John J. Davis. Prof. O. W. Oestlund and Prof. 

 \V. .M. Davidson and for their ready co-operation in every way. 



Aphis brassicac I.inne 

 1735 Aphii brassicae Linn. Syst. Nat. 1, i, p. 734. 



CABBAGE I.OL'SE 



«iN-(iKn vtvii'ARous KEM.ALe (Figure l6f) A). 



I.engtli of body '2.4 mm., width of mesothorax 0.7 mm., greatest width of 

 abdomen O.!)'' mm., wing expansion 6.9 mm. 



Prevailing color — Dark greenish-yellow or brownish, slightlv covered with 

 fine whitish powder. Head — .Slightly wider than long, anterior portion darker 

 than the base. v<Titral surface greenish. Antennae — (Figure 169 H). Reaching just 

 beyond the middle of the abdomen — not quite to base of cornicles — -dark, imbri- 

 cated, sparsely hahrcd, length of articles: I, 0.07 mm.; II, 0.08 mm.; Ill, 0.6 

 mm.; IV, O.'i.'i mm.; V, 0.28 mm.; VI, 0.65 mm. (spur 0.5 mm.), total 1.93 mm. 

 Large number of circular sensoria on article III. Roitrum — Reaching to third 

 eoxB", light with dark tip and base. Prolhorax — Dark except narrow greenish 

 band at base. Mesothorax — Black. Metathorax — -Amber with black basal band. 

 Abdomen — Dark green, yellowish brown or amber with dark transverse dorsal 

 markings and marginal spots, ventral surface distinctly segmented, evenly colored, 

 genital plati' slightly dusky. Cornicles — (Figure 169 D). Cylindrical, slightlv wider 

 just before tip, short, black, length 0.15 mm. Legs — Normal, dark amber brown, 

 eoxu- dark; femora with apicil oiii--half darker; tibia with base and apex darker; 

 tarsi dusky at base and tip. U'ings — Hyaline, normal (see drawing). Primary — 

 Subcostal wide, amber; stigma long, narrow, length 0.8 mm., width 0.15 mm., 

 amber; veins amber brown. Sti/le — Conical, as long or nearly as long, as cornicles, 

 light green or dusky, length 0.15 mm. 



Ai'TKRois vivii'ARois FKMALK ( Figure 1()9 B and C). 



Length of body 'J. mm., greatest width of body 1.2 nmi., robust and nearly 

 globular in shape. 



