32 



SCALE INSECTS OF SANTA CRUZ PENINSULA 



Trionymus smithii (Essig). 



From undetermined grass near Stanford University and Elytnus sp. 

 near San Jose. 



Trionymus villosa (Ehrh.). 



I have not myself taken this species in this area, but there are speci- 

 mens in the Stanford collection from Quercus agrifolia near Mountain 

 View. 



Trionymus sp. 



An undetermined Trionymus on bamboo on the Stanford campus. I 

 have previously included this with T. festucae but now regard it as dis- 

 tinct. It is doubtless introduced. 



Genus ACLERDA Sign. 



Aclerda californica Ehrh. 



Fig. 13. 



Originally described from this area, where it occurs quite commonly 

 on a particular, unidentified species of grass that grows in the chaparral 



Fig. 13. Aclerda californica (Ehrh.) : A, anal plate; B, wax duct; C, types of mar- 

 ginal spines ; D, pore ; E, dorsal aspect of posterior extremity of abdomen of 

 adult female. From specimen from topotype material. 



