FIG, i. The egg-mass of the Mosquito floating on the 

 water. It consists of nearly 300 eggs arranged in the form 

 of a little raft. 



FIG. 2. Four egg-rafts of the gnat with the young larvz 

 iust emerging into the water. 



k 



I 



FIG. 3. Six hours later nearly a thousand larvs have 

 emerged from the four egg-rafts. 



FIG. 4. The gnat larvee when four days old. The 1 - are 

 resting at the suriace and taking in air by their tail-tube... 



FIG. 5. When ten days old the larva) are full-grown. 

 They are still hanging from the under-side of the 'surface 

 film " and obtaining air from above by means of their tail- 

 tubes. 



FIG. 6. On the eleventh day they suddenly moult their 

 skins and change into pupas, which usually rest passively at 

 the surface, breathing by tubes on the prothorax, but at times 

 show an activity unusual in insect pupae. One pupa is seen 

 just in the act of casting off the larval skin. (See Fig. 7.) 



