SYSTEMATIC TREATMENT 35 



KEY TO GENERA REPRESENTED IN CALIFORNIA 



Note : This and succeeding keys are based upon carefully stained material. 

 The key to genera will apply to non-stained specimens, the keys to species will 

 not. It is assumed that satisfactory preparations will be available and no attempt 

 has been made to provide for the determination of species upon the basis of any 

 other. 



1. Posterior end of the abdomen of the adult female 



deeply invaginated, the anal ring at the inner end 



of this invagination Antonina 



Posterior end of the abdomen not invaginated 2 



2. Dorsum of the abdomen with circular pores only . 



Heterococcus 



Dorsum of the abdomen with triangular pores 3 



3. With a denticle on the face of the tarsal claws ....... 4 



Without a denticle on the face of the claws 5 



4. With a continuous series of conspicuous, chitinized 



areas about the margin of the body Puto 



Chitinized areas, if present, confined to the posterior 



end of the abdomen Phenacoccus 



5. With more than four pairs of cerarii . . Pseudococcus 



With not more than four pairs of cerarii 6 



6. Antennae of the adult female very short, 5-segmented, 



set close together at the front of the head . Ripersiella 

 Antennae of the adult female at least 6-segmented, not 



set close together at the front of the head 7 



7. Dorsum of the abdomen beset with short, stout "spearhead- 



shaped" spines Erium 



Dorsum of the abdomen with slender spines or setae 8 



8. Anal ring on the dorsum at some distance from the poste- 



rior end of the abdomen, antennae in all stages 6- 



segmented Cryptoripersia 



Not so : antennae of the adult female 7-8-segmented 



Trionymus 



Genus PSEUDOCOCCUS Westw. 



Coccidae of the type described above; without a tooth or denticle 

 on the face of the tarsal claw; with not more than 17 pairs of cerarii and 

 sometimes with not more than 5 distinct pairs; antennae of the adult 

 female 7- or 8-segmented, usually the latter ; male minute, the male larvae 



