NSECTS 



57 



to the others, and so little time is wasted in the building of the 

 home. 



At times Chironomous ventures out, and swims rapidly 

 towards the surface, possibly in order to obtain air, for the 



9. 



GNATS 



1. Larva of gnat. 2. Pupa of gnat. 3. Gnat. 4. Surgical instruments. 



CORETHRA 

 5. Larva of Corethra. 6. Pupa of Corethra. 7. Corethra. 



CHIRONOMOUS 



8. LarTa of Chironomous. 9. Pupa of Chironomous. 



habitat of these little creatures is usually a stagnant pond, 

 well supplied with decaying vegetable matter and poor in 

 oxygen, on which the larva depends. And this may make 

 one wonder how these little creatures manage to live at a 

 considerable depth in stagnant water. It so happens that 



