CONTENTS 



Page. 



Introduction 9 



Historical statement regarding cactus insects 11 



Number and classification of cactus insects 12 



The principal insects injurious to Opuntia, in order of their importance 13 



Insects affecting the roots or stems 13 



Species of the genus Moneilema 13 



Description of the larva of Moneilema crussum 14 



A cutworm 15 



Coccidae 15 



Species attacking the joints externally 15 



Chelinidea vittigera Uhler 15 



Nature of injury 16 



Distribution 17 



Variations 17 



Life history, and description of stages 18 



The egg 18 



The nymphal stages 18 



Dimorphism 19 



Hibernation 19 



Chelinidea tabulata Westwood 19 



Chelinidea sp 20 



The control of Chelinidea vittigera and allied species 20 



Mimorista flavidissimalis Grote 20 



The adult 21 



The larva 21 



The pupa 21 



Seasonal history 21 



Damage 21 



Control 22 



Disonycha varicornis Horn 22 



Stylopidea picta Uhler 22 



The cottony cochineal insect (Dactylopius confusus Cockerell) 23 



Enemies 24 



Control 24 



Minor species attacking the joints externally 25 



Species attacking the joints internally 25 



Melitara junctolineella Hulst 25 



Diversity of habits 27 



Description of immature stages 27 



The larva 27 



The pupa 27 



Parasite 27 



Control 27 



5 



