)LLECTmO VIPTERA 28* 



of blotting-paper is thru coiled within this cavity, and it 

 is over this thai a few drops of a Bolution of cyanide of 

 potash Le poured."* 



It is asele >llect flies in a bare bottle; the insi 



soon exhale moisture sufficient to ruin them. The blotting- 

 paper prevents this, and the cork can readily be removed 

 from one bottle ami put into another when a sufficient 

 quantity of flies is collected.f Moisture of any kind in- 

 jures flies. 



• In the earlier part of the season many rare specinx 

 of Diptera may be obtained bj beating. For this purpc 

 1 employ a rather heavier net wire, to which a pointed net 

 of cheese-cloth is attached. On such occasions it is neci 



■\ to carry with one a larger bottle with a little cotton- 

 wool in the bottom for chloroform, and a vial of the latter 

 in the pockel to be poured into the larger bottle. By 

 thrusting the end of the net. with its contents, for a few 

 Is into the chloroform bottle, -me can then remove 

 the specimens undisturbed. Mik advises that minute flies 

 should he preserved alive in small bottles filled with paper 

 clippings, through the cork of which a small glass tube is 

 thrust nearly to the bottle. For a collecting-net, afl 

 many experiments and failures. 1 have found mosl servi 

 able a simple, rather light, hrass wire, soldered together t<> 

 fOTm a ring aboul 38 cm. (10-11 inches) in diameter, ami 



firmly attached t<> a light handle aboul one metre long. 

 The net is made ..f very coarse bobbinet lace, the n 

 viceable and. in the end, the cheapest material. The net 

 >h< aid he readily handled with one hand. 



•• Specimens should not he allowed to remain overnight 

 unpinned. The large specimens may he pinned through 



* Dr. WillistOD writc< me: "I notice that a good many coll, 

 now use such a bottle for all kinds of ins 



+ ••11" one," says It Williston in a letter, " ; ; - that he 



cannot carry a box to pin specimens in, lie should p n-wool or 



paper clippings rice paper in his cyanide bottle •> i revent • 

 ing about of pilose specimens." 



