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T aeniorhynchus , etc., and observe that to the naked 
eye they are very similar. 
1. Note that the nymphae of Anophelines lie 
less vertically in the water than those of Culex . 
2. Observe that the nymphs of Anophelines are 
more elongated antero-posteriorly and compressed 
laterally than those of Culex and T aeniorhynchus . 
Fig. 31 . Nymphal Syphon Tubes 
3. Observe the very large nymphs of some 
common species of T aeniorhynchus and the great length 
of air syphons which are directed straight forwards in a 
very characteristic manner. 
