COLLECTING INSECTS. 63 



dition in a two per cent, solution of formalin. Further experiments 

 in this method are very desirable. 



Wasps and other smooth, non-hairy Hymenoptera may be put into 

 sawdust. 



Bees should if possible be pinned, and sent home in corked boxes; 

 but when this is not practicable, they should be put into pill-boxes, 

 with some chips of tissue-paper to prevent them rolling about. 



Diptei'a. — A few of the larger Diptera may be dealt with in the 

 same way as bees ; but as a rule they require special modes of 

 treatment. See special instructions. 



AjHera. — The Spring-tails (CoUembola) are among the most difficult 

 of all insects to preserve. They may be put into spirit, but, when 

 possible, specimens of each species should be mounted dry on card, 

 or pinned with the finest pins. The Fish-insects [Lepisma) may be 

 treated in the same way. 



