73 



head, the front part of which is only half the width 

 of the posterior portion. On the last segment there 

 is a swimming fan. There is no respiratory syphon. 

 They lie horizontally rather deep in the water and are 

 extremely voracious (Fig. 25). Add some Coretbra 

 larvae to a glass of water containing Culicine larvae and 

 watch the result ! 



THE LARVAE OF ANOPHELINES 



To collect the larvae. Necessary apparatus : 



1. An ordinary spoon. 



2. A white enamel tin or large cup, or an ordinary 

 bath tin. 



3. Bottles, specimen tubes, paper, pencils, etc. 



I. By inspection. Inspect closely the surface of 

 any small puddles that have been in existence some 

 time. Examine especially small rock puddles, small 

 shallow pools in ' nullahs ' and river-beds, in the dry 

 season. 



Examine especially the edges where larvae are fond 

 of resting, with the head facing the open water and the 

 tail touching the bank. Note also how larvae tend to 

 cling to floating twigs, etc. If no larvae are seen, stir 

 up vigorously the bottom of the pool with the spoon. 

 This will dislodge larvae from the edges, etc. 



Examine the surface of the pool again and observe 

 the larvae now plainly visible against the muddy water. 

 Wait a few minutes for the appearance of the larger 

 larvae, which remain below longer than the younger 

 forms. Examine carefully for nymphae, which easily 

 escape detection. 



Dip out the larvae and nymphae with .the spoon 

 as they appear. The thinner the edge of the spoon the 



