HOW TO KNOW THE IMMATURE INSECTS 



4. Separator. — This is also known as the Ber- 

 lese funnel. It consists of a funnel over which a 

 sieve is placed. The funnel leads into a recep- 

 tacle which contains liquid preservative. Over 

 the top of the funnel a light bulb is placed by 

 which the heat and light drive the insects down 

 until they fall into the receptacle. A rack or 

 special container is often employed to support 

 the funnel. Where a constant source of hot 

 water or steam is available the funnel may be 

 surrounded by a water jacket or coils of hollow 

 tubing which greatly reduces the fire hazard. 



Fig. 42. Separator: 

 A, container; B, light; 

 C, funnel; D, screen; 

 E, preservative. 



5. Aspirator. — This is also known as a suction bottle. It is conven- 



Fig. 43. Aspirator. 



lent to collect small insects either from the sweeping net or from under 

 stones, bark, etc. Its construction is illustrated in the figure 43. 



6. Other Apparatus. — Different sizes of bottles and vials are needed 

 for storing insect specimens. Tweezers, forceps, pocket knife, small 

 shovel or spade, note book, labels, etc., are all important in collecting 

 insects. It is preferable to have a collecting bag to store those tools 

 for fieldwork. 



HOW TO PRESERVE SPECIMENS 



For facihtating permanent study and handling, the insects must be 

 killed and carefully preserved to make good specimens. It is impor- 



24 



