60 THE CALIFORNIA SPECIES OF MEALY BUGS 



Big Basin; Diplacus glutinosus, Woodside; Solanum sp., Permanente 

 Creek, Santa Clara County; Toxicodendron (Rhus) diversiloba, Stevens 

 Creek and Corte Madera Creek, Santa Clara County. In the Stanford 

 collection from Catalpa at Columbus, Ohio. Recorded by Hollinger (as 

 Phenacoccus pettiti) from numerous hosts in Missouri and by Sanders 

 (as Phenacoccus osborni) from sycamore at Columbus, Ohio. What is 

 possibly the same species has been described by Sulc as Heliococcus bo- 

 hemicus from Robinia pseudacacia in Bohemia and Moravia. 



Authentication. Specimens from the type host and locality agreeing 

 with the original description. 



Notes : This is one of the most distinctive species of the genus. Mr. Mor- 

 rison has kindly furnished me with copies of the figures accompanying the original 

 description of Heliococcus bohemicus Sulc and these leave no doubt that this 

 species is extremely close to P. stachyos, if it be not the same. It is worthy of 

 note that Robinia pseudacacia is a native of Eastern North America, where Phe- 

 nacoccus stachyos appears to be quite common. Mr. Morrison also informs me 

 that Phenacoccus osborni Sanders appears to be the same. 



I do not for the present accept the genus Heliococcus. The genus can be 

 maintained only on the basis of the peculiar ducts, for it is in all other respects 

 not different from typical Phenacoccus. On this basis Pseudococcus virgatus 

 (which is indeed not a Pseudococcus) would be included in Heliococcus, although 

 it does not belong to the Phenacoccus series. Until the group is better under- 

 stood it may be well to maintain the present arrangement. 



Phenacoccus solani new species. 

 Plate 2, fig. 21. 



1914. Pseudococcus solani Ckll. ; Essig, Mon. Bull. State Com. Hort. 3, No. 

 3:122, fig. 35. (Misidentification?) 



In life. Dusted with powdery secretion, with no lateral or caudal 

 tassels. Ovisac not known. 



Morphological characteristics. Antennae 8-segmented in the adult 

 female. Tooth of the tarsal claws usually very small. None of the cerarii 

 with more than two conical spines, these, in all the cerarii, small, sharply 

 pointed, accompanied by no auxiliary setae and by but the slightest group- 

 ing of the pores, the cerarii being so obscure that in the adult it is only 

 with difficulty they can be traced. Anal lobe cerarii sometimes with a 

 single small hair, sometimes with two or three very small spines in addition 

 to the cerarian spines; borne upon the dorsal surface of the anal lobes. 

 No chitinization either dorsally or ventrally. Dorsal body setae small, 

 sharply pointed, of a characteristic lanceolate shape. Triangular pores 

 numerous, accompanied by a very few cylindrical ducts without a raised 

 rim about the mouth. Anal lobe setae about one and one-half times as 

 long as the anal ring setae. 



Immature female in general resembling the adult. 



