welch] 



WATER INSECTS 



143 



Do not use hard water. Change the water if a foul odor or a 

 tilni appears in the jar. 



(/. Supply suitable food for the insects. 



;;. Hoic to Make the Outdoor Aquarium (For Insects Living in 

 Running Water). 



A very simple out-door cage can be made as follows : Take 

 a banana crate or something of similar shape and size ; remove all 

 of the extra wooden parts leaving only the bare frame ; saw 

 this frame across in about the middle of its length ; surround 

 the side and one end with fine wire screening. It will be better 

 if the wire screening of the one end can be put on in the form 

 of a lid which can be taken off at will. This cage, when finished, 

 can be placed over any object in the natural running stream and 

 pushed deep enough into the bottom so that the larvae and 

 nymphs cannot escape. 



WHAT IS .\X INSECr.^ 



The pupil who is to study insects should acquire a clear idea 

 of what we mean by an insect. A full grown insect has three 

 distinct parts to its body, namely, the head, the thorax (the 

 middle part to which are attached the legs and wings), and the 

 abdomen (the hindermost part). It also has a pair of "feelers" 

 (antennae) which project from the head, three pairs of jointed 

 legs, and usually two pairs of wings. 



Stagi£s IX THI-: Life of the Mosquito. 1, the Adult; 2, the 

 Larva ; 3, the Pupa. 



