38 INSECTS NOXIOUS TO AGRICULTURE. 



Larvae active,, naked; adult females and 

 pupae active or stationary, naked or covered 

 with secretion ; adults sometimes apodous ; ab- 

 domen of females exhibiting a median cleft and 

 two dorsal lobes LECANIDINTK. 



Larvae active, naked, exhibiting at the ab- 

 dominal extremity two protruding anal tu- 

 bercles. Adult females exhibiting abdominal 

 cleft and dorsal lobes; naked or covered with 

 secretion HEMICOCCIDIN^E, 



Females in all stages exhibiting anal tu- 

 bercles ; no abdominal cleft or dorsal lobes ; 

 naked or covered with secretion COCCIDIN^E. 



