^<^L-l] Esslg. — Aphididae of California 335 



young fruit of cherries and forming large curled pseudogalls on 

 the former. Very common in this district and often the cause of 

 much worry to orchardists. Collected at Berkeley, California, 

 April 25 and August 21, 1916. Disappears soon after the last 

 date. 



Myzus circumflexum (Buckton). This is a very pretty yellow 

 or pale green and black species which is a common greenhouse 

 pest infesting maidenhair, asparagus and holly ferns and a great 

 many other plants already listed by other writers. During the 

 past year the species was taken on the tender shoots of the Cali- 

 fornia laurel or pepperwood, Umbellularia californica Nutt., 

 campus, April 16, 1916, on the flower heads of Pentstemon specta- 

 hilis Thurb., campus, March 29, 1916, and on the lower leaves of 

 both of the show lilies, Lilium elegans grandiflorum and L. 

 speciosum rubrum growing in a lath-house at Oakland, Califor- 

 nia, July 25, 1916. 



Myzus fragaefoUi Cockerell. A small pale yellow aphid in- 

 festing the undersides of the leaves of the cultivated strawberry 

 and at times causing considerable smutting of the foliage. Taken 

 at Niles, California, June 16, 1916. 



Myzus varians Davidson (fig. 20). A pale yellow or green 

 and black species somewhat resembling Eliopalosiphum persicae 

 (Sulzer) which occurs in large colonies on the host plants and 

 often causes much smutting of the foliage. Taken throughout 

 the spring and summer on clematis, Clonatis hrachiata Thurb., 

 on the campus and appear to reach their maximum development 

 when collected, June 9th to the 29th, 1916. It was also taken 

 July 7, 1916, at Berkeley infesting the terminal shoots of peach, 

 causing the leaves to curl and become reddened much as if in- 

 fected with peach curl. "Within the pseudogalls thus formed were 

 great numbers of the aphids ; one or two trees were severely 

 injured by the attacks. 



Pentalonia nigro nervosa Coquerel. A very interesting small 

 black species greatly resembling Idiopterus nephrelepidis Davis. 

 Specimens were received from Mr. E. ]\I. Ehrhorn, who collected 

 it on ferns at Honolulu, H. T., in March, 1916. This insect does 

 not occur in California, but might be introduced or may have 

 been, and could be easily mistaken for the other species which it 

 resembles. It has previously only been reported on banana. 



Hyalopterus arundinis (Fab.) (fig. 21). An average sized, 

 pale green and black species with the bodies usually covered with 



