72 THE CALIFORNIA SPECIES OF MEALY BUGS 



or slender setae. Dorsum with relatively few triangular pores and cy- 

 lindrical ducts and very few multilocular pores. Last two segments of 

 the abdomen with many short, slender, curved hairs both dorsally and 

 ventrally, the remainder of the body with few. Anal ring rather small, 

 the anal ring hairs quite short, the anal lobe hairs somewhat longer. 



Immature female differing from the adult in having the antennae 

 6-segmented and in having the cerarian spines more or less setiform. 



Type host and locality. From Elymus condensatus, Santa Paula, 

 Ventura County, Calif. 



Hosts and distribution. I have specimens of this from an unknown 

 grass, Santa Clara Valley, Ventura County; from Elymus sp. at Alum 

 Rock Park, San Jose; from undetermined grass growing in the chap- 

 arral on Jasper Ridge near Stanford University. 



Authentication. Cotypes examined. 



Notes : This is one of two species included by Essig under his Ripersia 

 smithii. The other having been later described as Trionymus calif ornicus Ehrh., 

 the name smithii must be retained for the specimens herein described. 



Trionymus villosa (Ehrh.). 



Plate 3, fig. 31. 

 1899. Riprsia villosa Ehrhorn, Can. Ent. 31 :6. 



In life. "Female in clusters and single in the crotches of twigs of 

 oak. Sac loosely woven of long white wool, oval, about 2 mm. long and 

 1 mm. broad. Female when removed from the sac, bright crimson. . . ." 

 (Ehrhorn). The specimens here described were in all probability not 

 fully mature as the species reaches a much larger size. 



Morphological characteristics. Antennae of adult female 7-seg- 

 mented. Cerarii present only on the anal lobes, the cerarian spines small 

 and slender but conical, accompanied by four or five small setae and with 

 no grouped pores. On the two or three segments preceding the last three 

 there is, at each margin, a single spine somewhat larger and stouter than 

 those of the dorsum, these perhaps representing the vestiges of the cerarii 

 of these segments. In the immature females these spines are quite prom- 

 inent, but they are somewhat difficult to distinguish in the adult. Dorsal 

 body setae few, scattered, quite small and slender. Derm with many tri- 

 angular pores and also with numerous short, stout cylindrical ducts with 

 a narrow raised rim about the mouth. Dorsum without multilocular 

 pores. Anal ring hairs quite small, scarcely exceeding one-half the length 

 of the anal lobe hairs. 



Immature female not seen. 



Type host and locality. From Quercus agrifolia at Berkeley, Calif. 



