34 Breeding Selenia illastraria. 



size of the abdomen). As soon as the first moth emerges the 

 remaining pupae should — without being exjrosed to a high tem- 

 perature or to sunshine — be placed in a warm room, and the moths, 

 as they emerge, be placed in a cool moist place, and there be kept 

 in absolute darkness. A refrigerator, or a zinc cover constructe d 

 on the evaporating butter-cooler principle, may possibly have to be 

 used here. For convenience in removing the moths without excitin g 

 them or injuring their claws, it seems best to place each pupa in a 

 separate chip-box, having a black net lid. This is the course which 

 the writer intends to follow. The moths can be roughly sorted by 

 the eye, but for the sake of greater accuracy a pair of compasses 

 should be used. (See the remarks on these in Mr. Galton's paper.) 

 If the species to be measured is small or lively, it may be necessary 

 to temporarily stupify it by placing it under a glass with a few 

 drops of chloroform on blotting-paper. 



