MOSQUITOES AND GNATS 



29 



hunchback appearance. The proboscis projects forward but not suffi- 

 ciently so as to be on a line with the axis of the body (Fig. 14). The 

 palpi in the female are short, in the male usually long. The wings, as a 

 lule, are without spots. 



Adults of the anopheles group when thus at rest hold the body at an 

 angle of about forty-five degrees with the wall's surface, the abdomen 

 directed outward (Fig. 

 14) . The proboscis 

 projects forward on a 

 line with the axis of 

 the body. In both 

 sexes the palpi are 

 about as long as the 

 proboscis. The wings 

 are usually spotted. 



The larva of Culex, 

 when at the surface 

 of the water, rests in 

 an oblique or vertical _ 

 position with the re- 

 spiratory tube at the 

 exact surface (Fig. 15). 



The resting larva of 

 Anopheles floats in a 

 horizontal position just 

 beneath the surface. 

 There is no respiratory 

 tube, the spiracles 

 opening on the eighth 

 abdominal segment 

 which is applied to 

 the surface (Fig. 15). 



Eggs of Culex are de- 

 posited upon water in 

 masses, the rafts of eggs 

 often being more or less 

 boat-shaped (Fig. 10). 



Anopheles lay their eggs upon water unmassed, the eggs floating 

 singly by lateral expansions (Fig. 16). 



The mosquito breeding in our Southern States which carries yellow 

 fever from man to man, ^Edes calopus iStegomija calopiis, S. fasciata), 

 is rather peculiarly marked. Upon each side of the thorax is a broad, 

 silveiy, curved line, between which there are two parallel median lines 

 and a slender discontinuous line, the whole pattern presenting somewhat 



Fig. 15. — At top, half grown larva of Anopheles in 

 breathing position, just beneath the surface film. At 

 bottom, half grown larva of Culex in breathing position 

 — greatly enlarged (after Howard, Bui. No. 25, Bureau 

 of Entomology, Dept. of Agr.)- 



