10 A CONTRIBUTION TO THE KNOWLEDGE OF 



Notes : In the original description of this species it is stated' that the body 

 tapers posteriorly into a tail. It is in fact the anterior end that tapers, this 

 being due in part to the natural form and in part to the fact that the abdomen 

 when full of ova shrinks less than does the anterior portion of the body. This 

 differs from the other species of this genus herein dealt with by the very stout 

 marginal setae. The immature stages very much resemble the immature stages 

 of Icerya rileyi, but may be distinguished by the groups of stout spines on the 

 dorsum. 



Paleococcus plucheae (Ckll.)? 



Type host and locality. From Pluchea sp. near Las Cruces, N. Mex. 



Material examined. A fragmentary specimen from the type ma- 

 terial and specimens from Baccharis sp. in the river bottom below Ele- 

 phant Butte Dam, N. Mex. 



Habit. Smaller than the preceding, 5 to 6 mm. long. Rather 

 thickly covered with powdery secretion and with rows of tufts, all of a 

 yellowish color. 



Morphological characteristics. Differing from P. morrilli only in the 

 much more abundant pores of the dorsum and in having the marginal 

 setae noticeably more slender and not accompanied by short spines. 



Notes : This determination is entirely provisional, the specimen from the 

 type material being in too poor condition to aid in recognizing the species. The 

 specimens at hand agree with the original description in the color of the secretion 

 and are from the same river valley as the types. 



Paleococcus townsendi (Ckll.) ? 



Type host and locality. From Gutierrezia on the Mescalero Indian 

 Reservation, N. Mex. 



Specimens examined. From Peucephyllum schottii at Shaver's Well, 

 a few miles east of Mecca, Cal. 



Habit. Resembling the preceding but with the secretion pure white. 



Morphological characteristics. Resembling P. plucheae in abundance 

 of dorsal pores but differing from both this and P. morrilli in having all 

 spines and setae very slender. 



Notes : This determination is entirely provisional, being based only upon 

 similarity in the color of the secretion. This is the first record of the occur- 

 rence of any species of this genus in California. 



