DISCUSSION OF GENERA AND SPECIES 29 



Pseudococcus aurilanatus (Maskell). 



An introduced species, reported from within this area only on Arau- 

 caria excelsa at Mountain View. 



Pseudococcus gahani Green. 



1919. Pseudococcus gahani Green; Ferris, Jn. EC. Ent. 12:292. 



This is an introduced species, known from this area only from Hills- 

 borough and San Francisco. It infests a wide range of hosts. 



I have elsewhere (ref. cited) pointed out that this is the proper 

 name for the species that has passed under the name of Pseudococcus 

 citrophilus Clausen. 



Pseudococcus crawii (Coq.). 



Within this area this species has been taken only from Quercus chry- 

 solepis and Pasania densiflora. 



Pseudococcus eriogoni (Ehrh.). 



Originally described from Eriogonum sp. in this area. It occurs 

 commonly on this and several other hosts. 



Pseudococcus longisetosus Ferris. 



Described from this area. It has been taken from the roots of Oro- 

 banche tuberosa and Castilleia foliolosa. 



Pseudococcus maritimus Ehrh. 



Originally described from Eriogonum latifolium at Santa Cruz. It 

 occurs throughout the area on a wide range of wild and cultivated hosts. 



Pseudococcus quercus Ehrh. 



1919. Pseudococcus quercus Ehrh. ; Ferris, Jn. EC. Ent. 12 : 298. 



Originally described from this area where it occurs quite commonly 

 on Quercus chrysolepis and Pasania densiflora. 



I have elsewhere (ref. cited) explained the reasons for the resurrec- 

 tion of this name and the dropping of Pseudococcus quercicolus Ferris. 



Pseudococcus ryani (Coq.). 

 Occurring within this area only on Sequoia sempervirens. 



Pseudococcus salinus (Ckll.). 



A native species, found only on the salt marsh grass, Distichlis spi- 

 cata, in the marshes about San Francisco Bay. 



