Vol.1] Essig.—Aphididae of California 339 



California, July 5, 1916 ; on woolly milkweed, Asclepias vestita 

 H. & A., Visalia, California, July 19, 1916, by W. P. Baird, and 

 on honeysuckle, Lonicera, sp., and catalpa, Catalpa, sp., at St. 

 Helena, California, June 18, 1916, by C. W. Woodworth. 



Aphis herderae Kalt. ? A small dull black species occurring 

 in compact colonies on English ivy, Hedera helix Linn., and a 

 number of other plants is certainly not Aphis rumicis Linn., so 

 is provisionally listed as this species. Abundant at Berkeley, 

 California, and collected June 2, 1916. 



Aphis helianthi Monell is a pale or dark green species with 

 black markings on the winged form and occurs abundantly on 

 the undersides of the leaves of the common and wild sunflower, 



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Fig. 24. Aphis cardui Linn. Apterous viviparous females taken from 

 ]ilum tree, Campus, April 10, 1916. (Original. Photo bv Div. Sei. Illust., 

 Univ. Calif.) 



Helianthus annuus Linn. Unrecorded specimens first taken by 

 the writer at Pomona, California, in 1909. 



Aphis heraclei Cowen.^° A medium dark species with greenish 

 or reddish mottlings on the dorsum. Occurs abundantly on the 

 old yellow leaves of Heracleum mantegazzianum Sommier & 

 Levier in the botanical garden on the campus, June 9, 1916. 



Aphis malifoliae Fitch (syn. Aphis sorhi Kalt. for here). A 

 common rosy and black species also slightly covered with a 

 whitish pulverulence. Occurs on the young fruit and curls the 

 leaves of apple. Often a serious orchard pest.- Collected at 

 Berkeley, California, April 28, 1916, by E. L. Prizer. 



10 I am indebted to Mr. .John J. Davis for the determination of this 

 species and for the information that the specific name is also i)reoccupied 

 by Aphis heraclei Koch, thus necessitatins; a new name for the above. 



