DISCUSSION OF GENERA AND SPECIES 13 



Monophleboid Coccidas in which the legs are lacking in the interme- 

 diate stages of the female; immature stages without an anal tube; adult 

 female with mouthparts, with digitules on the claw and without knobbed 

 hairs at the tip of the tibia, without reticulations on the legs and antennae, 

 with 7-segmented antennas; all stages (except perhaps the first) with six 

 pairs of abdominal spiracles ; adult male wingless, without compound 

 eyes. 



Notes : It is possible that this genus should be merged with Steingelia, but 

 the male of S. britannica (Green) is winged. Until the intermediate stages of 

 Steingelia have been described it may be well to maintain the two genera as 

 distinct. 



Stomacoccus platani Ferris. 



Originally described from this area where it is abundant on the 

 native sycamore, Platanus racemosa. It has also been taken from P. occi- 

 dentalis, an introduced species within this area. 



Genus ORTHEZIA Bosc. 

 Orthezia occidentalis Douglas. 



Orthesia calif arnica Ehrh. appears to be the same as O. occidentalis. 

 I have received a specimen of the latter from Professor Cockerell and 

 am unable to detect any differences. 



This species is rather common, occurring on the crowns and roots of 

 various plants, especially Eriophyllum confertiflorum. I have once taken 

 it from cells in the hard, dry soil clinging to the roots of a species of 

 Dudleya on the cliffs near New Years Point. 



Genus ASTEROLECANIUM Targ. 

 Asterolecanium variolosum (Ratz.). 

 Common on Quercus agrifolia, Q. lobata, and Q. douglasii. 



Genus MYCETOCOCCUS Ferris. 



Mycetococcus ehrhorni (Ckll.). 

 1918. Mycetococcus ehrhorni (Ckll.); Ferris, Can. Ent., 50:330, fig. 15A. 



This species (formerly referred to Cerococcus) was originally de- 

 scribed from this .area. It occurs only on oaks and probably infests all 

 the local species (including the tan oak, Pasania densi flora). It especially 

 favors the live oak, Q. agrifolia, the limbs of which are frequently gray 

 with the fungus which is invariably associated with the insect. 



