SYSTEMATIC TREATMENT 53 



Hosts and distribution. From Distichlis spicata in the salt marshes 

 at Palo Alto. Probably occurs throughout the range of this host at least. 



Authentication. Specimens compared with the type material by Mr. 

 Morrison. 



Notes: I have examined specimens (from Essig collection) collected at La 

 Jolla and determined by Cockerell as P. salinus, but which are evidently not P. 

 salinus, belonging instead to the species herein described as Trionymus distichlii 

 n. sp. The most striking features of P. salinus and those which at once separate 

 it from any other are the almost simple anal ring, the extremely short anal lobe 

 and anal ring setae, and the fact that the anal ring is borne upon the ventral side 

 of the abdomen instead of on the dorsal side. 



Pseudococcus sequoiae (Coleman). 

 Plate 1, fig. 3. 



1901. Dactylopius sequoiae Coleman, Proc. Calif. Acad. Sci., (3), 2:410-418, 



pi. 27. (As to the female.) 



1910. Pseudococcus ryani (Coq.) ; Essig, Ponoma Col. Jn. Ent. 2:148, fig. 61. 

 (Not of Coquillet.) 



In life. Thinly covered with powdery secretion, the lateral and 

 caudal tassels practically lacking. Oviparous, the eggs placed in a very 

 long, slender and somewhat fluted ovisac. 



Morphological characteristics. With 17 pairs of cerarii the first 

 three or four pairs with 3 spines, the remainder with but 2, all very 

 small, those of the anal lobe pair somewhat the largest. The lateral 

 cerarii without auxiliary setae and without grouped pores, so obscure as 

 to be distinguishable only with difficulty in the adults. Anal lobe pair 

 with three or four slender setae, the base of each of these and of each 

 of the conical spines being surrounded by a little chitinous ring; with 

 very few pores, these not grouped. Ventral side of the anal lobes without 

 chitinized area. Dorsal body setae few, very small. Triangular pores 

 few. Small cylindrical ducts without a raised rim about the mouth ex- 

 tremely abundant, especially at the lateral margins of the body. Anal 

 lobe setae somewhat shorter than anal ring setae, accompanied by two 

 very small minor setae. 



Immature female differing but little from adult. 



Type host and locality. From Sequoia sempervirens, near Stanford 

 University. 



Hosts and distribution. On Cupressus macrocarpa throughout the 

 bay region, at Santa Cruz and at Cypress Point near Monterey. From 

 Sequoia sempervirens near Stanford University. There appears to be 

 but one generation a year, this, in the vicinity of Stanford, maturing 

 early in June. 



Authentication. Types examined. 



