^»-.T.]B>t^.l-^PJ 



PLATE V 



Fig. 34. — Trap emergence box used for determining the first appearance of pear thrips in the spring, and their numbers 

 in the soil. (After Cameron and Treherne. B.C.) Fig. 35. — Combined trap cone and cylinder of tin used for 



holding the glass vials and filled into the holes of the soi emergence boxes. (A)ler Cameron and Treherne, B.C.) 

 Fig. 36. — The skeleton wire twig cage to be covered with cheesecloth. (After Parroll and FiiUon) Fig. 37. — A con- 

 venient method of storisg insect material. (Photo by Parrott and Fulton). Fig. 38. — A convenient box-like cage. 

 (Photo by W. .1 . Ross) Fig. 39. — Boxes used in experiments relating to pupae of Apple maggot fly. (.After W. 

 H Britlahi). Fig. 40. — Boxes used in experiments relating to the larvae of Apple maggot fly. (After W. H. Britlain). 



