Vol.1] Essig. — Aphididae of California 331 



granarimn (Kirby) on the leaves, stems and in the heads of oats 

 at Martinez, California, June 12, 1916. It was later taken in 

 the heads of barley at Rutherford, California. June 21, 1916. 

 This is very close if not synonymous with RJiopalosipJium rhois 

 Monell. 



Rhopalosipkum lacfucac (Kalt.). A normal-sized green and 

 black aphid first taken by the writer on the common sow thistle, 

 So)whus oleraceus Linn., at Santa Paula, California, April 3, 

 1916, and erroneously labeled EJ(opalosiphum pcrsicae (Sulzer). 

 Last year it was collected on the same host plant at Berkeley. 

 California, June 28, 1916, and at San Jose, California, July 14, 

 1916 



Bhopalosiphum ncrvatum Gillette. A green species smaller 

 than the common rose aphis, Macrosiphum rosae (Linn.), and 

 distinguished from it by the darker wing veins and swollen 

 cornicles. Occurs throughout the year and collected, February 

 20, 1916. (See R. arhuti Davidson). 



Bhopalosiphum iiymphaeae (Linn.) (fig. 18). A large dark- 

 red plant louse covered with a fine white pulverulence or often 

 a shiny dark green form as appears in the late summer. Winged 

 and apterous viviparous females, all pink or dark-red, were first 

 taken on tender twigs of a plum tree on the campus, April 7. 

 1916, where they occurred in large, compact colonies. The 

 species, the same color phase, was also taken on plum in 

 Golden Gate Park, San Francisco, California, INIay 25, 1916. By 

 the middle of June none could be found on the plum in either 

 locality, but on June 21, 1916, the dark green and shining phase 

 w^as very abundant on water plantain, Alisma plant ago Linn., 

 and pondweed, Pofarnogeton natans Linn., at Rutherford, Cal. 



Bhopalosiphum pcrsicae (Sulzer). This is a very common 

 green species with a conspicuous black patch in the middle of the 

 abdomen of the winged form. It is an omnivorous feeder, attack- 

 ing a very large number of plants. Among those observed during 

 the past year were : Lavatera assurgentiflora Kellogg, campus. 

 June 27, 1916; Clarkia clcgans Dough, campus, IMarch 29, 1916; 

 Pentstemon spectahilis Thurb., campus, IMarch 29, 1916; Cali- 

 fornia laurel or pepperwood, Umhellularia californica Nutt., 

 campus, April 16, 1916 ; nasturtium, Hayward. California, April 

 19, 1916 (coll. by Roy E. Campbell) ; tulip tree, Liriodciiclron 

 tulipifera (Linn.), campus, April 2-t, 1916; tobira or Japanese 

 pittosporum, Pittosporum tohira Ait., campus, July 5, 1916; 



