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Pomona College Journal of Entomology 



and they are dark Indian red or brown. The face is yellow and hairy, with median 

 dark line. Antennse are black with long dorsal arista. Thorax iridescent dark 

 blue or green, covered with long fine hair or pubescence. Scutellum same color 

 as the mesothorax. Legs — coxte dark; femora dark with tips light; tibiae amber 

 or yellowish, slightly darker at tips ; tarsi dusky. Abdomen velvety black with 

 three pairs of marginal curved transverse bands on the dorsum. These bands do 

 not come together in the middle and really form six bands. 



Figure 203. Lasiophthicus pyrastri 



A, larva; B, puparium; C, adult. 



This is a very widely distributed and common species and feeds on nearly 

 every species of plant lice. It is especially abundant on twigs infested with 

 Macrosiphum citrifolii Ashm., Toxoptera aurantiae Koch., and Aphis gossypii 

 Glover. 



Syrphus americanus Wied. 



(Figure 204. A) 

 Although this species is much smaller than the above described species, it is 

 considered to be one of the largest species in the genus, averaging three-eighths 

 of an inch in length. It greatly resembles Lasiophthicus pyrastri L. in general 

 form and color. The eyes arc dark reddish brown. Face amber yellow with dark 

 band in the middle extending from base of the antennae to the mouth. Antennas 



