REPORT OF THE SOCIETY 1 7 



The more elaborate insectaries have greenhouses attached and ha\e accommo- 

 dation for the office, containing the collections and library, the photographic 

 room, a cold storage room, for hibernating forms, and sometimes a room for 

 sleeping quarters. 



Twig Cages — In the study of insects that attack buds it is often necessary 

 to place cages on the twigs so as to enclose the bud and the insect. Parrott and 

 Fulton of the Geneva Station, in their studies of tree crickets as disease carriers, 

 devised a skeleton wire cage of copper wire (Fig. 36) . Two copper wires of unequal 

 length were twisted tightly for a short length near their middle, then spread and 

 bent into the form required. The end of the long wire was wrapt around the 

 twig with cotton to hold the cage in place which is then covered with a cheese 

 cloth. This cage is also useful in the study of aphids. 



Cameron and Treherne of Vernon, B.C., used mica chimney cages in their 

 study of the oviposition of pear-thrips on the buds. These cages were filled with 

 a cotton sleeve at each end and securely fastened to branches of the trees. 



The same investigators devised trap-emergence boxes for determining the 

 first appearance of pear-thrips in the spring and their numbers in the soil. Fig- 

 ures 34 and 35 furnish the details of the construction of such a box. 



The list of rearing devices described in the foregoing pages is very incom- 

 plete, for nearly every investigator of insect life history has contrived some device 

 that he has found useful. Unfortunately, however, many have not taken the 

 trouble to photograph and describe it. The writer is under deep obligation to 

 those entomologists who have sent him photographs and descriptions for the pur- 

 poses of this article. He is hopeful, however, that a more complete article will 

 soon be prepared by some person who will take the trouble to illustrate and des- 

 cribe all the rearing devices in use by our entomologists, for he believes that such 

 an article or bulletin would be a helpful reference guide in the majority of stations 

 and laboratories. 



