SYSTEMATIC TREATMENT 57 



Hosts and distribution. Essig has recorded this species from the 

 type host in Ventura County. Otherwise it is known only from the 

 original locality. It very probably occurs throughout the range of this 

 host, at least. 



Authentication. Specimens from type host and locality, agreeing 

 with original description. 



Notes : The only really distinctive feature of this species is the curiously 

 prominent character of the anal lobes. In some species the anal lobes are more 

 or less prominent in immature individuals, this prominence disappearing in the 

 adult, but in P. artemisiae the prominence remains. Otherwise the species is 

 scarcely distinguishable from P. colemani. 



Phenacoccus colemani Ehrh. 



Plate 2, fig. 20. 

 1906. Phenacoccus colemani Ehrhorn, Can. Ent. 38 :332-3. 



In life. Thinly dusted with waxy powder, without noticeable lat- 

 eral or caudal tassels. Oviparous, the eggs laid in a very loose; fluffy 

 ovisac. The species is scarcely, if at all, distinguishable in life from 

 Phenacoccus solani n. sp., although structurally they are sufficiently dis- 

 tinct. 



Morphological characteristics. First three or four pairs of cerarii 

 with three or four conical spines, the remainder with but two, except for 

 the anal lobe pair, in which there may be as many as four. In all, the 

 spines are quite small, slender, sharply pointed and somewhat constricted 

 at the base. In the typical form the anal lobe cerarii have but two con- 

 ical spines which are accompanied by three or four very small spines. 

 This form, however, grades over into another in which one or two of the 

 small spines are equal to the larger in size, and into another form in 

 which the small spines are replaced by a single stiff seta. In all the 

 cerarii there are but few pores, and no auxiliary setae. Dorsal body setae 

 very few and scattered, small, more or less conical, not constricted at the 

 base. Triangular pores few, mingled with a few tubular ducts. Anal 

 lobe setae nearly twice as long as anal ring setae. 



Immature female differing but little from the adult. 



Type host and locality. From Rubus sp., Pescadero road, south of 

 Palo Alto, Santa Clara County, Calif. 



Hosts and distribution. I have taken this from Rubus vitifolius, 

 wild strawberries, Symphoricarpos racemosus, Castilleia sp. Eriophyllum 

 confertiflorum and from beneath a rock, associated with ants, in the hills 

 near Stanford University. Mr. Swain has sent me specimens from ge- 

 ranium at Riverside. 



