72 Transactions of the Royal Canadian Instiute 



4. Abdomen of female blunt, with short cerci; hypopygium of male 



with the side-pieces curved down, or shortly projecting 5 



Abdo,m^n of the ferraale pointed, cerci exserted ; hypopygium of male 

 with the side-pieces prominently projecting, straight 6 



5. Wing-scales normal, narrow Genus Culex L,innaeus 



Wing scales distinctly large and broad, 



Genus Mansonia Blanchard 



6. Abdomen of female with the eighth segment wholly retractile, nude; 



male harpagones with multiple terminal appendages, 



Genus Psorophora Robineau-Desvoidy 

 Abdomen of the female with the eighth segment only partly re- 

 tractile; maJe harpagones with only a single appendage. 



Genus Aedes Meige'n 



Tribe Sabethini. 



The mosquitoes of this tribe are almost wholly tropical. Their larvae 

 live in the water that collects in plants, either living or dead, such as the 

 leaf-bases of Bromeliaceaej flowet-bracts of Helicohia, cavities in tree^ 

 trunks, cocoanut shells, cacao shells and palm-spathes. One species has 

 a northern distribution, living in the leaves of the pitcher-plant, which 

 grows in swamps. 



Ge;nus Wyeomyia Theobald. 



A large genus of tropical distribution, most of the species addicted 

 to the water in Bromeliaceae. The gemis has been subdivided into sub- 

 genera on the characters of the maie genitalia (Dy'ar, Ins. Ins. Mens., 

 vii, 114-142, 1919). The single species here referred to falls in the sub- 

 genus Dendromyia Theobald. 



Wyeomyia (Dendromyia) smithii Coquillett. 



Aedes smithii Coquillett, Can. Eht., xxxiii, 260, 1901. 



A small stout mosquito with dark mesonotum and legs, the abdomeh 

 black above, silvery white below, the colours separated on the sides in a 

 straight line. Prothoracic lobes submetallijc blue. Patches of silvery 

 white scales on the sides. A small group of minute bristles on the 

 posterior side of the metanotum, only visible with microscope or very 

 strong lens. 



The larvae live in the water in the leaves of pitcher-plants {Sarracenia 

 purpurea), passing the winter frozen up in the ice-cores. The eggs are 

 laid on the still dry newly opened leaves, and hatch when water collects 

 in them. 



