Vol.1] Essig. — Aphididae of California 329 



1916. Taken on the former, July 5, when it appeared to have 

 reached its maximum devek)pment, and on the latter, June 29, 

 1916. 



Macrosiphum rosac (Linn.). This is the common large green 

 and reddish louse so common in the rose gardens of the state. 

 Besides being found on all varieties of roses, this species has 

 also been taken on the stems of the heads of the fuller's teasel, 

 Dipsacus fullonum Linn.. June 7, 1916, the red valerian or 

 Jupiter's beard, Centraxfhus niher DC, June 23, 1916, at 

 Berkeley, California, and on wild rose. Rosa calif ornica C. & S., 

 at Rutherford, California, June 21, 1916. 



Macrosiphum solanifolii (Aslimead). A large pale yellow or 

 green aphid attacking a large number of plants. On the campus 

 it was collected on yarrow, Achillea millefolium. Linn., March 29, 

 1916, and on tobira or Japanese pittosporum, Pittosporum tohira 

 Ait., July 5, 1916. Also taken on the tender shoots of the 

 American, white or water elm. Vim us americanus Linn., in Golden 

 Gate Park. 8an Francisco, California, May 25, 1916. 



Macrosiphum sta)dcjii Wilson. A beautiful large yellow and 

 black species abundant on the undersides of the leaves of the red 

 elderberry. Sauibucus raconosa callicarpa Jepson. on the campus 

 throughout the spring, sunnner and fall months. It was taken 

 in fewer numbers on the tender growth of the blue elderberry, 

 S. glauca Nutt., growing along the creek in shady places on the 

 campus, ]May 15, 1916. 



Idiopicrus ncphrclcpidis Davis. A small pitch black species 

 with whitish legs and l)lack clouded areas in the wings. It is 

 becoming of considerable economic importance as a pest to green- 

 house and household ferns. During the past year it has been 

 observed to be quite injurious to the common and improved 

 Boston ferns, Xcphrolepis, spp., as well as to the holly fern, 

 Cyrtomium falcatum J. Smith. 



Amphorophora latysiphon Davidson. A large green and black 

 species with black conspicuously swollen cornicles. Large num- 

 bers of apterous and a single winged individual were taken on 

 the crowns at and under the surface of the ground of Shasta 

 daisies. Chrysanthemum, sp., Berkeley, California, August 15, 

 1916, and on the tender opening buds of the common garden 

 cowslip. Primula, sp., December 17, 1916, at the same locality. 



Amphorophora ruhi (Kalt.). A large green aphid attacking 

 the terminal shoots of the cultivated blackberry, Ruhus, sp., and 



