63 



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 the one which is 

 concerned in the transmission of yellow fever (Stego- 

 myia calopus v. 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 orders Lepidoptera 

 (moths), Hemiptera (aphides, green flies, etc.), Heter- 

 optera (plant bugs), Neuroptera (caddis flies, stone 

 flies, white ants). Pick out any mosquito-like flies. 

 They will probably belong to the Chironomidae. 

 Note that true mosquitoes are not seen around the 

 lamp. 



