ILLUSTRATIONS. 



PLATES. 



Pago. 

 Plate I. Longicorn beetle, Moncilcma crassum, an important enemy of the 



prickly pear 12 



II. Work of the longicorn beetle, Moneilema crassum, on the cactus, 



Echinoccrcus sp 12 



III. Work of the moth, Mimoristafavidissimalis, on joint of Opuntia 20 



IV. Larva? of the flea-beetle, Disonycha varicornis, on Opuntia leptocaulis. 20 

 V. Two important scale insects of the prickly pear: The cottony cochi- 

 neal insect (Dactylopius confusus) and Diaspis echinocacti cacti 24 



VI . Joint of prickly pear showing work of Marmara opuntiella 32 



VII. Studies of cactus insects. Fig. 1. — Eggs of Melitara junctolineella on 

 spines of Opuntia. Fig. 2. — Eggs of Chelinidea vittigera on spine 

 of Opuntia. Fig. 3. — Eggs of Copestylum marginatum on Opuntia 

 spines. Fig. 4. — Narnia pallidicornis 32 



TEXT FIGURES. 



Fig. 1. Chelinidea vittigera: Adult 16 



2. Chelonus laticinctus, parasite of Melitara dentata 28 



3. Gerstxckeria nobilis: Adult 30 



4. Marmara opuntiella: Adult, larva, eggs, and pupal case 31 



5. Opuntia fruit with puparia of Asphondylia opuntix 34 



6. Copestylum marginatum: Adult ! 37 



7. Hermetia chrysopila: Adult 38 



8. Stictomyia longicornis: Profile, head, and wing 39 



7 



