Pomona Colleok JorRNAi. of Entomoi.oc.y 3*)*J 



(vivipara) is dark brown with a tiiedian dorsal yellow line. It has the 

 hairs and other characteristics of the jjenus Chaitophorus. f)n Salix spf>. 



Chaitophonis populifoliae Fitch 

 The specimens agree with Oestlinids (lescrii>ti<)n of this species. Mr. J. j. 

 Davis writes me that he is certain I Jestlund's s|)ecinicns are not the same 

 as those described hy Fitch. Hoth alate and apterous viviparae occured com- 

 monly on Populus frcmontii Wats. 



Callipterus quercus Kalt 

 This is the same insect that I listed under this name in the Journal of 

 Economic Entomology Aug. 1910, p. 367. I cannot compare it satisfactorily 

 with any native Callipterus, while it compares favorably with Buckton's 

 description of C. quercus. I have taken specimens of this insect in the Santa 

 Clara valley on the under side of the leaves of Quercus lobata N'ee, Q. cali- 

 fornica Cooper, Q. douglasii H. and A., and on an imported English oak. 

 Quercus rohur ( ?). It seems to attack the last-named more severely than 

 the others. On Q. lobata Nee. in Placer County. 



Aphis brassicac Linn 

 On cabbages, uncommon. 



Aphis lutescens .Monell 

 This bright yellow insect was observed in abundaiice on the stalks antl 

 hoods of Asclepias mexicoua Cav. 



Siphocoryne conii Davidson 

 The Placer County specimens are identical with those taken at I'alo .Mto 

 on Coiiium maculatum 1.. and described hy me in the Journal of Economic 

 Entomology. Aug. 1909. The insect is rare in Placer County. Its food- 

 plant is an umbelliferous plant which I have been unable to identify. 



Rhopalosiphum dianthi Schrank 



Common on Soiiclius olcraccus L. In the Santa Clara valley both this 

 species and Macrosiphum sonchella Monell are found commonly on sow- 

 thistle, sometimes together on the same specimen of food plant, but in Placer 

 County I failed to find the latter species although I examined considerable 

 numbers of the food-plant. 



Macrosiphum californicum L'larkc 

 Common on the tips of willow shoots where they cause the shoot to curl. 

 They prefer the young stem growth to the leaves. 



Macrosiphum rosae Ream 

 Fairlv common on cultivated roses. 



