DIPTERA. 



39 



it will at some time annoy him, feels the greatest interest in its 

 life-history." 



As this is the case, let us explain the history of these insects, 

 which excite so much interest. The illustrious naturalist we have 

 just mentioned will be our guide. 



Figs. 19 and 20. The Gnat (Culex pipiens). 



The body of the gnat is long and cylindrical. When in a state 

 of repose one of its wings is crossed over the other. They present a 

 charming appearance when seen through a microscope, their 

 nervures, as well as their edges, being completely covered with 



Fig. 21. Antenna of Gnat, magnified. 



Fig. 22. Head of Gnat, magnified. 



scales, shaped like oblong plates and finely striated longitudinally. 

 These scales are also found on all the segments of the body. 



The antennae of the gnat, particularly those of the male, have 

 a fine feathery appearance (Fig. 21). 



Their eyes, covered with network, are so large that they cover 



