338 



University of California Puhlications [Entomology 



Aphis cardui Linn. (fig. 24). A fairly large green and black, 

 shiny aphid. The apterous fundatrix occurred in small colonies 

 on the tips of tender plum suckers on the campus, April 10, 15, 

 24, 25, 1916. It is very common throughout the svimmer in great 

 colonies entirely covering all parts of the bull thistle, Cirsium 

 lanceolatum Linn. 



Aphis ceanothi Clark (syn. A. ceanothi-lvirsuti Essig). A 

 small dull reddish and black species which becomes very abundant 



Fig. 23. Aphis brassicae Linn. A winter colony on the leaf of brussels 

 sprouts. Berkeley, Cal., Nov. 6, 1916. (Original. Photo by Div. Sci. 

 must., Univ. Calif.) 



on various species of Ceanotlius throughout the state. Taken at 

 Berkeley and on the campus infesting Ceanotlius thrysiflorus 

 Esch. and soapbush, Noltea africana Reichb., June 2, 1916. Also 

 very common on soapbush in Golden Gate Park, San Francisco, 

 California, May 25, 1916. 



Aphis gassy pit Glover. A small dark green or black aphid 

 usually feeding in dense colonies. Abundant on the creek milk- 

 weed, Asclepias speciosa Torr., and a few on cascara sagrada, 

 Rhamnus purshiana DC, on the campus. July 3 and 5, 1916. 

 Also taken on show lily, Lilium speciosion ruhnon, Oakland, 



