PLATE XII. Aleyrodidae. 



1. Trialeurodes coryli Britton, — larvae, x i. 



2. Trialeurodes morrilli Britton, — larvae, x i. 



3. Aleuroplatiis plumosus Quaintance, — larvae and pupae, x 10. 



4. Aleyrodes asarumis Shimer, — larvae, pupae and adults, x 4. 



5. Trialeurodes vaporariorum Westwood, — greenhouse white fly, 



larvae and pupae, x 4. 



6. Trialeurodes vaporariorum Westwood, — pupae and adults, x 4. 



Photographs : i and 2 by W. E. Britton; 3 and 4 by B. H. 

 Walden ; 5 and 6 by H. A. Doty. 



