SUBFAMILY ERIOCOCCIKAE 127 



in the antennae. It is hoped that it will save at least the repeated 

 reading of a large number of descriptions. The arrangement of 

 the genera placed after the table is that of the table. It is not 

 intended to show anything as to the relationship of the genera. 



GENERA OF ERIOCOCCINAE 



a. Thorax of adult female with three pairs of normal legs, 

 b. Insects not producing or living in galls upon plants. 



c. Anal ring bearing six anal ring setae in at least some stage of 



development of insect, 

 d. Anal ring bearing six anal ring setae in all stages, nymphs 



and adult. 



e. Antennae of adult female with less than nine segments. 

 f. Antennae consisting of eight segments. 



g. Body of insect oval in outline, subdepressed, en- 

 closed in cottony wax but not in cottony sac of wax; 

 body not bearing numerous short conical setae, 

 h. Body with lateral margins not produced into 

 series of blunt tubercles, each bearing cerarus. 

 i. Adult female with lateral margins of body con- 

 vex, body about twice as long as wide; nymphs 

 of male with antennae consisting of six seg- 

 ments; abdomen with labiae and usually with 



more than four pairs of cerari. 



Pseudococcus Westw. 



ii. Adult female with lateral margins of body 



straight and subparallel, about three times as 



long as wide; nymphs of male with antennae 



consisting of eight segments; abdomen with 



labiae and never with more than four pairs of 



cerari; antennae of adult female sometimes 



consisting of seven segments. Trionymus Berg. 



hh. Body with lateral margins produced into series 



of prominent blunt tubercles, each bearing 



cerarus; cephalabiae and caudalabiae present. 



Tylococcus Newst. 



gg. Body of insect circular in outline, globular or sub- 

 globular, without lateral cottony tufts and enclosed 

 wholly or in part in cottony sac of wax; body bear- 

 ing short conical setae and with only anal cerari 



present. Erium Maskell. 



ff. Antennae consisting of less than eight segments. 



g. Adult female not enclosed in shining black scale 

 with caudal orifice. 



h. Anal lobes not strongly chitinized with blunt 

 spine-like projections at distal end. 



