546 Pomona College Journal of Entomology 



are the color of the body, articulations light, lengths of articles: I, 0.15 mm.; II, 

 0.13 mm.; Ill, 1.2 mm.; IV, 0.95 mm.; V, 0.85 mm.; VI, 1.7 mm. (spur 1.4 mm.) ; 

 total 4.98 mm. Rostrum — Reaching to second coxa, green with dark tip. Cornicles 

 — (Figure 180 b). Apical one-fourth dark, remainder green, length 1.3 mm., width 

 0.12 mm. at base. Legs — Long, slender, hairy; coxa? green; femora amber; tibia? 

 amber with dusky tips; tarsi dark, very small. Style — Ensiform, green, may be 

 slightly dusky at marginal tip. 



You7ig — Green and covered with tlie powdery wax when very small. 



Host — Occurs in great colonies on the flower racemes of Lupinus albifrons. 



Locality — Santa Paula Canyon, near Santa Paula, Cal. Altitude 700 to 1500 

 feet. Date of collection — May 7, 1911- Serial number 34. 



This species greatly resembles M. destructor (John.), but is more 

 robust, larger, and covered with the whitish powder. The abdomen of the winged 

 form is distinctly globular and very characteristic. The abdomen of the apterous 

 form is mucii wider than in M. destructor. It is quite effectually preyed upon by 

 larvas of Syrphid Flies, Coccinellids, and by internal parasites, which are very 

 large. 



Macrosiphum frigidae Oestlund 

 ARTEMISIA APHID 

 LITERATURE AND SYNONYMY 



1886 Siphonophora frigidae Oestl., List, of Aphid, of Minn., p. 20. 



1887 Nectarophora frigidae Oestl., Aphid, of Minn., p. 83. 



1910 Siphonophora frigidae Oestl., Williams, Aph. of Nebr., pp. 78-9. 



WINGED VIVIPAROUS FEMALE (Figure 181 A) 

 Length of body 2.1 mm., width of mesothorax 0.65 mm., greatest width of 

 abdomen 0.76 mm., wing expansion 7.5 mm., medium sized species, body sparsely 

 covered with rather long fine hairs. 



Prevailing color — Very dark olive green or nearly black, shiny, iridescent 

 green, very striking and beautifully colored, unless observed very closely will 

 appear jet-black. Head — Wider than long, very dark or black. Eyes — Black or 

 dark brown, medium in size. Antennae — (Figure 181 D). On distinct frontal (some-r 

 what gibbous) tubercles which are very wide, as long as the body, but not reaching 

 to tip of the style, dark throughout except the base of article III which is light, cov- 

 ered with many long fine hairs, lengths of articles: I, 0.12 mm. ; II, 0.07 mm. ; III, 

 0.69 mm.; IV, 0.45 mm.; V, 0.40 mm.; VI, 0.84 mm. (spur 0.7 mm.) ; total 2.57 

 mm.; at least fifteen large circular sensoria on article III. Rostrum — Reaching to 

 second coxae, black. Thorax — Shiny black. Abdomen — Little wider than thorax, 

 deep green with metallic luster, dorsal surface with many broad shallow pits which 

 indicate the segmentation, hairy. Cornicles — (Figure 181 C), Cylindrical, widest 

 at base, imbricated, black, with one or two hairs, reaching slightly beyond tip of 

 style, length 0.50 mm., width at base 0.13 mm. Legs — Coxa? dark; femora dark 

 with light base ; tibise with middle portion light and ends dark ; tarsi dark ; hairy. 

 Wings — Hyaline, normally veined. Primary — Length 3.6 mm., width 1.25 mm.; 



