GENERAL ZOOLOGY 



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Fig. 15.37. Diptera. A, larvae 

 and pupa of a mosquito, Aedes, 

 breathing at the surface of the 

 water; the functional spiracles of 

 the larva are posterior, whereas 

 those of the pupa open dorsally 

 on the thorax, fi, emergence of 

 an adult Aedes from its pupal 

 skin. C, a predaceous robber 

 fly, Apiocera, feeding upon the 

 juices of a leafhopper. Note the 

 small, club-shaped haltere, or 

 balancer, attached to the meta- 

 thoraxof the fly; this is the char- 

 acteristic condition of the hind 

 wings in dipterans. (From E. S. 

 Ross, Insects Close Up, copyright 

 1953 by University of California 

 Press, reprinted by permission.) 



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