328 University of California Publications [ENTOMOLooi 



the thimble berry, Euhus parviflorus Nutt., on the campus, INIarch 

 29, 1916. At this date there were also a number of young pink 

 forms not observed during the sununer. The insects were especi- 

 ally abundant on the thimble berry in Wildcat Canon near 

 Berkeley, JNIay 24, 1916. The species is easily recognized by the 

 dusty tip of the primary wings. 



Macrosiplnim alhifrons Essig. A large green species covered 

 with a white pulverulence, which feeds upon various lupines, in- 

 cluding Lupinus latifolius Agarth. and tree lupine, L. arhoreus 

 Sims., on the campus, JMarch 29, 1916. 



Macrosiphum calif ornicum (Clarke) (syn. M. laevigatae 

 Essig). A bright green, large very slender species infesting the 

 terminal shoots of the young growth of various willows, especially 

 the arroyo willow, Salix lasiolepis Benth., and the yellow willow, 

 S. lasiandra Benth. Occurs on the campus throughout the sum- 

 mer and collected June 1, 13, and July 26, 1916. Also taken on 

 the arroyo willow at Rutherford, California, June 21. 1916. 



Macrosiphum granariuni (Kirby). A large green and black 

 aphid common on various grasses and taken as follows: oats, 

 campus, ]\Iarch 10, 1916, and at JMartinez, California, June 12, 

 1916; on meadow fox-tail, Alopecurus pratensis Linn., campus, 

 April 25, 1916 ; on Ampelodesma tenax Link, and wild rye, 

 Elymus, sp., campus, June 27, 1916. In case of the la.st two 

 plants the flower heads were entirely covered with the insects. 



Macrosiplnim lactucae (Schrank). A large bright green and 

 black species common on the tender terminal shoots of chicory, 

 Cliicori'um intyhus Linn., growing in an apparent wild state at 

 Rutherford, California, June 21, 1916. 



Macrosiphum ludovicianae (Oestlund). A large green species 

 with the bodies of many covered with a thin white pulverulence. 

 Collected on the campus IMarch 10, 1916, and at Rutherford, 

 California, June 21, 1916. In both cases the terminal tips of 

 the common wormwood or California mugwort, Artemisia hetero- 

 phylla Nutt., were infested.. 



Macrosiphum rhamni (Clarke). This large species is green 

 with a noticeable large reddish, nearly circular l)lotch in the 

 middle of the dorsum at the union of the thorax and abdomen. 

 This coloration is internal and disappears with mounting. 

 Apterous and winged forms were specially abundant on the 

 leaves of coffee berry, Rhamus calif ornicus Esch., and less com- 

 mon on cascara sagrada, B. purshiana DC, on the campus during 



