SYSTEMATIC TREATMENT 59 



Notes : The types of this species are in the Stanford collection, but are in 

 such bad condition that it is impossible to base a redescription upon them. The 

 original description contains nothing that will give any particular aid in recognizing 

 the species. The only distinctive feature that the types reveal is the presence of 

 many short, stout, cylindrical ducts. In this character the species is evidently very 

 similar to P. piceae (Loew) which has been redescribed by Marchal (7, pp. 243-5, 

 figs. 11-12). It is entirely possible that they are identical. 



Phenacoccus stachyos Ehrhorn. 



Plate 2, figs. 17, 22. 



1900. Phenacoccus stachyos Ehrhorn, Can. Ent. 32 :313. 



1904. Phenacoccus osborni Sanders, Ohio Nat. 2:284. 



1912. (?) Heliococcus bohemicus Sulc, Cas. spolec. Ent. 9:39, figs. 



1917. Phenacoccus pettiti Hollinger, Can. Ent. 49:281, fig. 



1918. Phenacoccus stachyos Ehrh. ; Hollinger, Ibid. 50:23. 



In life. Covered with mealy secretion from which there arise many 

 delicate, glassy threads of wax. Lateral and caudal tassels very short. 

 Oviparous, not forming a definite ovisac. 



Morphological characteristics. Ocular cerarii with three or four 

 cerarian spines, the remainder with but two, all small and slender, those 

 of the anal lobe pair but little larger than most of the others. No aux- 

 iliary setae and practically no concentration of pores about the cerarian 

 spines. Spines of the anal lobe pair borne at the extreme tips of the quite 

 prominent anal lobes. Ventral side of the anal lobes usually with a small 

 chitinized area extending in from the base of the anal lobe setae. Dorsal 

 body setae few, extremely small. Ventral setae long and slender. Tri- 

 angular pores few. Tubular ducts of a very peculiar type, many of them 

 extraordinarily large and all with their mouths borne at the apices of 

 conical prominences, about the base of which there may be from one to 

 four small spines. The base of many of these projections is surrounded 

 by a small circular, chitinized area. These ducts appear to have a rather 

 definite arrangement, there being from two to four on each anal lobe, two 

 or three near each cerarius, an indefinite number on the head and an 

 irregular double row along the median line of the body. It is from these 

 ducts that the long, glassy threads of wax arise. Anal lobe setae about 

 one and one-half times as long as the anal ring setae. Antennae notice- 

 ably long and slender. 



Immature specimens differing from the adult chiefly in a reduction 

 of the number of ducts. 



Type host and locality. From Stachys bullata, San Franciscquito 

 Creek, near Stanford University, California. 



Hosts and distribution. I have this species from Stachys sp., Woodside, 

 San Mateo County, and Big Basin, Santa Cruz County : Monardella sp., 



