122 MISCELLANEOUS STUDIES 



141. Aphis pseudobrassicae Davis 



Figure 231 

 Davis, Can. Ent., vol. 46, p. 231, 1914 (orig. desc.). 



Records. Brassica spp. ; Walnut Creek (Davidson), San Diego, Riverside: 

 Baphanus sp., Riverside, September, 1916, June, 1917 : Matthiola annua, Riverside, 

 February to May, 1917. 



Oftentimes in the spring this false cabbage aphis is found in large 

 colonies on radish, mustard, and so forth. Davidson has taken it in 

 the San Francisco Bay region, and the author throughout southern 

 California. The first few times that it was observed by the author 

 colonies of Aphis brassicae Linn, were also abundant. This led the 

 author to doubt its validity, and to undertake some breeding experi- 

 ments. In February, 1917, two colonies were started, each from one 

 alate female. They were followed through three generations, with the 

 result that all the individuals proved to be this species. At the same 

 time a colony of Aphis brassicae Linn, was started from one alate. 

 All the progeny of this individual proved to be the same. A. pseudo- 

 brassicae Davis differs from A. brass-icae Linn, in the following major 

 points : 



A. pseudobrassicae Davis: A. brassicae Linn.: 



Apterae not pulverulent. Apterae pulverulent. 



Cornicles of apterae longer than hind Cornicles of apterae shorter than 



tarsi. hind tarsi. 



IV of alates with sensoria. IV of alates without sensoria. 



142. Aphis ramona Swain 



Figures 232 to 235 

 Swain, Trans. Am. Ent. Soc., vol. 44, p. 14, 1918 (orig. desc.). 



Records. Ramona stachyoides; Nordhoff and Santa Paula, Ventura County 

 (Swain). 



This species has been taken twice in Ventura County by Essig. 

 It was described by the author from the specimens taken by Essig on 

 black sage. 



143. Aphis rubiphila Patch 



Patch, Maine Agr. Exp. Sta., Bull. 233, p. 269, 1914 (orig. desc.). 

 Records. Rub us spp.; San Jose, May, 1916 (Davidson). 



In the summer of 1916 Davidson found a species of Aphis infesting 

 loganberries and blackberries in San Jose, which was determined by 

 Dr. Patch as A. rubiphila Patch. Essig believes this to be a synonym 



