UEc.l89^.] I)a\i>. An KxoDi s UK W'a'i 1 k I'l 1 1 1 I ~. \\>\ 



ON THE USE OF BISULPHIDE. 



By Ai.HKKT p. Morse. 



In connection with tiie use of this agent as a fumigator for 

 killing insects in stored grain, destroying museum pests in natural 

 history collections, furs, carpets, etc., attention should be called 

 to the fact that its vapor is decidedly heavier than the air: con- 

 se(|uently, in ortler to get the full benefit of the amount used the 

 pans containing it shouiil be placed /t/\'/i up in the cases or bins 

 treated, never on the Jloor. This fact has been (|uite marked in 

 personal experience, where the odor of the chemical was much 

 more noticeable on tiie floor of the house below that on which it 

 was used. Reference to this peculiarity may have been made 

 before but if so it has escaped my notice. 



LOCAL ENTOMOLOGICAL NOTES. 



Members of the New York Kntoinologic.Tl Society and all oll)cis, .tic solicited 

 to contribute to tiiis column, their rare captures, local lists ami other items of 

 interest relating to the insect fauna of New York and vicinity. 



AN EXODUS OF WATER BEETLES. 



By W.M. T. Davis. 



On the borders of the salt meadow, not far from New Spring- 

 ville, on Staten Island, there is a little pond that receives an 

 abundant supply of water from a perennial spring. Masses of 

 Spirogyrn are festooned from the submerged sticks that lie in 

 extremely clear water, and there is also in season some liydrodictyon 

 and much floating Lemna. From this pond, on the 22nd of last 

 September, a bright sunny day, many hundred water beetles were 

 taking flight, some of them alighting on its surface again but the 

 majority flying westward over the salt meadow. The wind was 

 blowing gently from the south, so it had nothing to do with the 

 direction of their flight. .Ml that were examined proved to be 

 Hydrophiliis nimbaius, and their constant flying up from the surface 

 of the water, reminded one of that steady departure of winged 

 ants that so often takes place from the grass stems in a field. 



