66 MISCELLANEOUS STUDIES 



Records. Artemisia heterophylla ; Walnut Creek, Contra Costa County (David- 

 son), Berkeley, 1915 (Shinji); Artemisia dracunculoides, Convolvulus sp., Stachys 

 bullata, Berkeley, 1915 (Shinji). 



This species is quite common in the San Francisco Bay region on 

 various species of sagebrush. George Shinji has taken it also on hedge- 

 nettle and bindweed in Berkeley. It is distinguished from other sage- 

 infesting species of Macrosiphum by the fact that the body of the 

 apterous females is covered with pointed setae as opposed to the fan- 

 shaped setae of M. artemisicola (Williams), and the capitate setae 

 of M. artemisiae (Fonsc.). 



73. Macrosiphum orthoearpus Davidson 



Davidson, Jour. Econ. Ent., vol. 2, p. 304, 1909 (orig. dese.). 

 Davidson, Jour. Econ. Ent., vol. 3, p. 380, 1910 (list). 



Record. Orthoearpus purpurascens ; Stanford University (Davidson). 



Since Davidson found the specimens on owl-clover from which he 

 described this species, it has not again been taken. 



74. Macrosiphum pisi (Kalt.) 



Figures 130, 150 



Kaltenbach, Monog. d. Pflanzenlause, p. 23, 1843. Aphis (orig. desc.). 

 Davidson, Jour. Econ. Ent., vol. 2, p. 304, 1909 (list). 

 Davidson, Jour. Econ. Ent., vol. 3, p. 380, 1910 (list). 

 Essig, Pom. Jour. Ent., vol. 2, p. 336, 1910. Nectarophora (desc.). 

 Branigan, Mon. Bull. Cal. Comm. Hort., vol. 4, p. 285, 1915. M. destruc- 

 tor (Johnson) (list). 

 Davis, U. S. Dept. Agr., Bull. 276, p. 11, 1915 (list). 



Records. Pisum sativum; Claremont, Santa Ana, and Ventura (Essig) ; Ala- 

 meda County (Brannigan) ; El Cajon, San Diego County, May, 1916: Lathyrus 

 odoratus; Stanford University (Davidson, Morrison); San Diego, October, 1916: 

 Viola sp. ; Claremont, Santa Ana, Ventura (Essig); Medicago sp. ; Holtville, 

 Imperial County (V. L. Wildermuth) : Psorales macrostachya; Santa Paula 

 (Essig). 



The pea aphis is quite common throughout the state, especially on 

 garden and sweet peas. It has been taken a few times on other plants, 

 such as alfalfa, violets, and leather-root, but it is uncommon. This 

 species is readily distinguished by its bright, shining green color, large 

 size, and long, slender, imbricated, but non-reticulated cornicles. 



