6 PRINCIPAL CACTUS INSECTS OF UNITED STATES. 



Species attacking the joints internally — Continued. Page. 



Mt litara di /data Grote 28 



Mi litara prodt n lulls Walker 28 



M> litara ft rnaldialis Ilulst 29 



Gerstn <!:< ria j>orosa Le Conte 29 



Gerstivckeria nobilis Le Conte 30 



Ger&Uvch ria clathrata Le Conte 30 



Marmara opuntiella Busck 31 



Species injuring the blooms 32 



Species injuring the fruit 32 



Narnia pallidicomis Stal 32 



Descriptive 33 



Asphondylia opuntix Felt 34 



Cornifrons elautalis Grote 35 



Allorhina mutabilis Gory 35 



Sixeonotus luteiceps Reuter 3G 



Polistes spp 36 



Liotropis contaminatus Uhler 36 



Dyotopasta yumaella Kearfott 36 



Ozamia lucidalis Walker 36 



Platynota rostrana Walker 36 



Scavengers 37 



Copestylum marginatum Say 37 



Hermetia spp 38 



Stictomyia longicornis Bigot 39 



List of the principal cactus insects of the United States 39 



Species which injure the plant 40 



Parasites or enemies of the injurious species 45 



Scavengers 47 



Species which merely frequent the flowers 49 



Species incidentally associated with the plant 50 



Bibliography of cactus insects 53 



Index 59 



