44 THE CALIFORNIA SPECIES OF MEALY BUGS 



Pseudococcus eriogoni Ehrh. 



1899. Dactylopius eriogoni Ehrhorn, Can. Ent. 31 :103. 



1902. Erium eriogoni (Ehrh.); Cockerell, Ann. Mag. Nat. Hist., (7), 10:465. 



1913. Pseudococcus yerba-santae Essig, Pomona Col. Jn. Ent. 2 :85. 



In life. Adult female enclosed in a more or less definite sac. Lateral 

 tassels very short, confined to the posterior part of the body. 



Morphological characteristics. Antennae of the adult female nor- 

 mally 8-segmented, sometimes 7-segmented. Cerarii reduced in number, 

 there being but eight or nine pairs, counting forward from the anal lobes, 

 and usually an ocular pair, but none on the head between the eyes. The 

 ocular pair may contain several cerarian spines, the remaining cerarii 

 have but two, all being quite small, the anteriormost almost merging with 

 the body setae. In none are there any auxiliary setae except in the anal 

 lobe pair, which has 3-5 small hairs, and in none is there any grouping of 

 the pores. In some specimens there is a very small chitinized area on 

 the ventral side of the anal lobes which in extreme cases somewhat re- 

 sembles that found in P. citri, but this is variable in size and sometimes 

 entirely lacking. Dorsal body setae quite numerous, slender. Triangular 

 pores abundant, mingled with many large cylindrical ducts with a raised 

 rim about the mouth, these in many specimens being quite striking by 

 reason of their abundance. Anal lobe setae about twice as long as the 

 anal ring setae. 



Immature female in all essential respects resembling the adult. 



Type host and locality. From the roots of Eriogonum sp. Stevens 

 Creek, Santa Clara County, Calif. 



Hosts and distribution. From Eriogonum nudum, Stevens Creek, 

 Santa Clara County; Viola sarmentosa at the reservoir on Big Creek, 

 Santa Cruz County ; Stachys sp., Corte Madera Creek, near Stanford 

 University; Eriodictyon calif ornicum, Sespe Canyon, Ventura County; 

 Eriodictyon tomentosum, Del Mar ; ragweed, Upland, Calif. ; Ceanothus 

 cuneatus, southern California; Erigeron sp., locality unknown. 



Authentication. Material from the type host and locality, agreeing 

 with the original description. 



Notes: I have not seen the types of this species, but I have at hand speci- 

 mens taken from the roots of Eriogonum in the type locality and agreeing in all 

 respects with the original description, which was probably based upon immature 

 specimens. I have also examined the types of P. yerba-santae Essig and of P. 

 leptodontis Claussen MSS. and am unable to regard either of these as in any way 

 distinct. 



While this is not a typical Pseudococcus its affinities appear to be entirely 

 with that genus. The absence of cerarii between the eyes and along the anterior 

 portion of the lateral margins should be sufficient to prevent confusion with any 

 other species. The sac is by no means so definitely formed as the original de- 

 scription would indicate, the insects leaving it readily when disturbed. 



