65 



last pair stretched out stiff and straight,, or they 

 slowly oscillate to and fro. Many mosquitoes 

 wave the hind legs, notably Stegomyia, but they 

 are held with the tarsi curved backwards. 



The exact attitude adopted depends upon 

 the species and the situation, whether a vertical 

 or horizontal surface on which the Anopheline is 

 resting. One very common species (M. culicifacies) 

 at least,, when sitting on a wall, looks exactly like 

 a small brown Culex, since it holds its body parallel 

 with the wall as a Culex does. 



Culex. — Mosquitoes of the genus Culex are 

 many of them brown mosquitoes of sober hue, 

 e.g., the common house Culex, C. fatigans, which 

 is uniformly brown without markings. The genus, 

 however, contains a very large number of species. 

 In Culex mosquitoes the attitude when resting is 

 ' hunchback.' 



Stegomyia. — The genus Stegomyia is of the 

 greatest interest and importance, since it is this 

 form which is concerned in the transmission of 

 yellow fever (Stegomyia fasciata). 



These mosquitoes are generally black and 

 white, with banded legs and abdomen, and spots 

 on the thorax. They are found in houses, and 

 are most troublesome mosquitoes from their habit 

 of feeding- in the day, and their great alertness 

 and persistence. Stegomyia are also very common 

 in woods and forests. 



Capture of Mosquitoes and Flies 



I. Place a lamp upon a sheet of white 

 paper, and note the insects which are attracted 

 by the light. Note insects belonging to the 



F 



