A SYNOPSIS OF THE APHIDIDAE 153 



48. Genus Phylloxerina Borner 



Borner, Arbeiter aus d. kais. biol. Anst. f. Land- und Forstwirtschaft, 

 vol. 6, pp. i-v, 81-320, 1908. Type Phylloxera salicis Linn. 



This genus is represented in California by two species, one found 

 on the stems of cotton wood (Populus sp.) and the other on the stems 

 and exposed roots of willow (Salix sp.). 



181. Phylloxerina popularia (Pergande) 



Pergrande, Proc. Davenport Acad. Sci., vol. 9, p. 266, 1904. Phylloxera 



(orig. desc.). 

 Davidson, Jour. Econ. Ent., vol. 8, p. 420, 1915. Phylloxera (list). 



Records. Populus spp. ; Walnut Creek (Davidson), Merced (Beers). 



The only report of this species in California is the one of Davidson 

 who found it on Populus fremonti and Populus trichocarpa at Walnut 

 Creek. On October 14, 1915, A. A. Beers of Merced sent some speci- 

 mens to the author from balm of Gilead (Populus balsamifera) in 

 Merced. These were all apterous females, and were found in great 

 masses of white wax on the smaller branches and twigs. These reports 

 are the only ones since its original report from Texas and Louisiana 

 by Pergande. 



182. Phylloxrina salicola (Pergande) 



Pergande, Proe. Davenport Acad. Sci., vol. 9, p. 267, 1904. Phylloxera 



(orig. desc.). 

 Davidson, Jour. Econ. Ent., vol. 8, p. 419, 1915. Phylloxera (list). 



Records. Salix spp.; Walnut Creek (Davidson); Pasadena (Smith). 



This species was also reported from Walnut Creek by Davidson 

 on arroyo willow (Salix lasiolepis) where he found it on the stems 

 and exposed roots. On October 13, 1915, A. G. Smith sent the author 

 specimens from an ornamental willow (Salix sp.) in Pasadena, where 

 he found it very abundantly that fall. The specimens were all 

 apterous females, and were found in the midst of considerable masses 

 of wax. This species has only been reported from Illinois, District 

 of Columbia, and California. 



