15 



Hydrometra stagnonimj are occasionally found 

 with wings, but this is of rare occurrence. And 

 as their economy is very little known, the plan 

 suggested by Mr. Curtis^ " British Entomo- 

 logy/' Vol. i. fo. 2, for confining different spe- 

 cies " in a frame covered with coarse gauze, 

 and floating them," would be an easy method 

 of studying their natural history. The caddis 

 worms might be bred in a frame, sunk to the 

 bottom of a pond, allowing part of the frame 

 to rise above the surface of the water*. The im- 

 perfect Jield bugs (Cimices) are easily reared in 

 cageSj taking care to supply them plentifully 

 with the plant on which they are found. 



Pill Boxes. The collector should carry out 

 with him three or four dozen of pill boxes of 

 different sizes. The smallest size for minute 

 moths, Jlies, &c. Only one insect should be 

 placed in each box, as in opening the lid to put 

 in a second, the first will generally either escape 



* Mr. Donovan says, that " Swammerdam used to hatch 

 the eggs,iQedi ihelarvce, and preserve X\\q jnipce of aquatic 

 insets, in a shallow dish, which he covered with white 

 paper, occasionally moistened, and pierced in several parts 

 for the admission of air." 



