THEIR RELATION TO MAN 211 



ties. It is even more domestic than its ally and seems 

 to be confined to the vicinity of human settlements. It 

 is as susceptible to oil, in the larval stage, as any other 

 species and also hibernates as an adult. The eggs are 

 not laid in rafts, however, but are placed singly, not 

 even necessarily in water, and may remain dry for a 

 considerable period without losing vitality. When they 

 do become water-covered they hatch, and the life period 

 and stages are similar to those of pipiens. 



Fig. 98. — The yellow-fever mosquito, Siegomyia calopus: larva, pupa, adult. 



The species of Anopheles are longer and more slender 

 than the Citlex, and the wings are usually more or less 

 mottled or "dappled." The adult females hibernate in 

 houses when they can get in, and in May or June lay 

 eggs on the surface of water, singly or in little groups, 

 but not in boats or rafts. They are kept afloat by a 

 peculiar lateral supporting structure and hatch in a day 

 or two after they are laid. The resulting larva or wriggler 

 is altogether unlike that of Cidex or Stegomyia. It is 

 flatter, with a proportionately smaller head and a much 

 shorter breathing tube, and lies flat on the surface of the 

 water. It has similar mouth brushes but gets its food 



