114 Transactions of the Royal Canadian Institute 



ground-pools in dry country. In the presence of irrigation, several 

 generations may occur in the season, and the species become abundant. 

 The females are severe biters. The males swarm after sunset over 

 prominent objects on the prairie. 



Distribution: Dry valleys and plains from Mexico and Arizona|^to 

 Canada. 



Canadian Records. 

 Smoky, Alberta, August 24, 1915 (E. H. Strickland). 



Subgenus Finlaya Theobald. 

 A'des (Finlaya) triseriatus Say. 



Culex triseriatus Say, Journ. Acad. Nat. Sci. Phil., iii, 12, 1823. 



Finlaya (?) nigra Ludlow, Can. Ent., xxxvii, 387, 1905. 



Aedes triseriatus hendersoni Cockerell, Journ. Econ. Ent., xi, 199, 1918. 



A medium sized, black mosquito, with spotted abdomen. Mesonotum 

 dark brown in the middle, the sides silvery white. Abdomen black dor- 

 sally, with silvery white lateral basal segmental spots; venter white- 

 scaled, the posterior segments black-banded at apices. Legs deep black, 

 the femora silvery white below. Wing-scales black. 



The larvae live in the water in the holes in tree trunks, the winter 

 being passed in the egg state. The females are severe biters, and, though 

 never abundant, are often troublesome in dry woods. The habits of the 

 males have not been observed. 



Distribution: United States from the Gulf of Mexico to Montana, 

 New England, and southern Canada. 



Canadian Records. 

 De Grassi Point, Ontario, Jun,e 23, July 4, 1917 (E. M. Walker). 

 Jordan, Ontario, August 3, 1916 (E. Hearle). 



Subgenus Ecculex Felt. 

 Aedes (Ecculex) vexans Meigen. 



Culex vexans Meigen, Syst. Beschr. Eur. zweifl. Ins., vi, 241, 1830. 

 Culex articulatus Rondani, Bull. Soc. Ent. Ital., iv, 30, 1872. 

 Culex malariae Grassi, Rend, della R. Accad. dei Lincei, 1899. 

 Culex sylvestris Theobald, Mon. Culic, i, 406, 1901. 

 Culex vagans Theobald, Mon. Culic, i, 411, 1901. 

 Culex nocturnus Theobald, Mon. Culic, iii, 159, 1903. 

 Culex montcalmi Blanchard, Les Moust., 407, 1905. 

 Culicada nipponii Theobald, Mon. Culic, iv, 337, 1907. 



