PLATE IV 



Fig. 27.— Pomatum boxes used in breeding. iAfler WilrnxK Fig. 2S.— Plugged test tubes used in rearing fruit 



flies. (Aflet Wilcox) Fig. 29.— Entomological laboratory and insectary at Frcdcricton, X.B. Fig. 30. — Entomo- 



logical laboratory at .Treesbank, Man. Fig .? 1 .—.Shelters used for plant lice investigations at Mneland, (Pholo 

 by IF. .4. Ross). Fig. 31. — Shelters used at Lafayette, Ind. iPhnto by J. J. Davis). Fig. 33.— An outdoor 



laboratory with tar-paper roof and screened with wire netting. (I'hoto by Dr. Malheson). 



