30 SCALE INSECTS OF SANTA CRUZ PENINSULA 



Pseudococcus sequoiae (Coleman). 



Originally described from this area, where it is common on Sequoia 

 sempervirens and is at times a pest on Cupressus macrocarpa. 



Pseudococcus timberlakei Ckll. 



Originally described from this area, where it is found only on the 

 salt marsh grass, Distichlis spicata, about San Francisco Bay. 



Genus PHENACOCCUS Ckll. 

 Phenacoccus colemani Ehrh. 



Originally described from this area on Rubus sp. It is a rather 

 common species, infesting various hosts among which are Rubus viti- 

 folius, wild strawberry, Symphoricarpos racemosus, Castilleia sp. and 

 Eriophyllum confertiflorum. 



Phenacoccus eriogoni Ferris. 



Originally described from this area on Eriogonum nudum. 



This species is extremely close to P. helianthi (Ckll.). It differs 

 from the latter only in having a small, median cluster of spines on the 

 dorsum of the last abdominal segment and in having six to eight spines 

 in the lateral cerarii, while helianthi has in general but two. 



Phenacoccus solani Ferris. 



Originally described from this locality on the roots of Hemizonia 

 rudis. It has also been taken from the roots or crowns of potato, tomato, 

 wild radish and Malva sp. 



I have recently received specimens of this species from the crowns 

 of "ragweed," Ambrosia sp., at Gainesville, Florida. In these specimens 

 the antennae may be either eight- or nine-segmented. 



This species so combines the characters of Phenacoccus and Pseudo- 

 coccus that it might with equal propriety be referred to either genus. I 

 am inclined to retain it in Phenacoccus. 



Phenacoccus stachyos Ehrh. 



Originally described from this area on Stachys sp. I have taken it 

 from several other hosts, including Rhus diversiloba, Monardella sp., 

 Diplacus glutinosus and Solanum sp. 



