106 



INJURIOUS AND BENEFICIAL INSECTS OF CALIFORNIA. 



Fit 



8G. — The large rose aphis, Macrosiphum rosir (Linn.). Winged and apterous 

 females. Greatly enlarged. (Author's illustration, P. C. Jr. Ent. ) 



THE RED COMPOSITE APHIS 



Macrosiphum rudbeckice (Fitch) 



(Aphis rudbeckios Fitch) 



I Fig. 87 ) 



Description. — The aphis is dark red in all stages, though the mature 

 forms are often much darker than the young lice. It is large and con- 

 spicuous with relatively long antennae and honey tubes. The color, size, 

 habit of collecting in dense colonies and its very restless nature when 

 disturbed make its identity easy. The length varies from -j 1 ^ to £ inch. 



Fig. 87. — The red composite aphis, Macrosiphum rudbeckiw (Fitch), 

 enlarged. (Author's illustration, P. C. Jr. Ent.) 



Greatly 



Distribution.— This plant louse is found throughout the State. 

 Food Plants.— Many of the composite plants are attacked by this 

 insect and it may usually be found on any of the following: aster, chrys- 



