14 



THE CALIFORNIA SPECIES OF MEALY BUGS 



ficiently different in life to indicate that they are distinct and structurally, 

 while very similar, are sufficiently well marked to be readily separable in 



Fig. 2. Pseudococcus quercicolus n. sp. ; antennal graph drawn from specimens 

 taken from Quercus chry sole pis and Pasania densiflora in the vicinity of 

 Stanford University. 



Fig. 3. Pseudococcus ryani (Coq.) and P. sequoiae (Coleman) ; antennal graphs 

 drawn from specimens taken from Sequoia in the vicinity of Stanford Uni- 

 versity; graphs of ryani drawn in solid lines, those of sequoiae in broken 

 lines; shaded area indicates the gap between the two. 



good preparations. Text figure 3 represents the graphs of the two spe- 

 cies obtained from individuals taken from Sequoia in the same locality. 

 It will be noted that the two graphs are in part quite distinct and that 

 there is an evident tendency for the average of one to lie well below the 



