84 Transactions of the Royal Canadian Institute 



Clasp-filament swollen mesially,; harpago with all the setae on the 

 inner aspect, in some speciefe soldered to the side-piece, 



Janthinosoma Lynch A^ibalzaga 



One species of Psorophora will probably be found to reach Canada, 



as it has been reported from the Champlain Valley in northern New York, 



but a short distance from the Canadian boundary. One species of 



Janthinosoma, also, is known to occur. 



Psorophora (Psorophora) ciliata Fabricius. 



Culex ciliata Fabricius, Ent. Syst., iv, 401, 1794. 

 Culex molestus Wiedemann, Dipt. Exot., 7, 1821. 

 Culex tibialis Robineau-Desvoidy, Mem. Soc. Nat. Hist. Paris, iii, 404, 



1827. 

 Culex ruhidus Robineau-Desvoidy, Mem. Soc. Nat. Hist. Paris, iii, 404, 



1827. 

 Psorophora hoscii Robineau-Desvoidy, Mem. Soc. Nat. Hist. Paris, iii, 



413, 1827. 

 Culex conterrens Walker, Ins. Saund., Dipt., 427, 1856. 

 Culex perterrens Walker, Ins. Saund., Dipt., 431, 1856. 



A very large mosquito, with dusky wings and shaggy, white-ringed 

 legs. Scales on palpi and base of proboscis mostly shaggy and erect, 

 dark. Mesonotum with smooth nude areas, a line of golden scales in 

 the middle, and large patch of silvery gray ones on the shoulders. Ab- 

 domen brown scaled, with scattering white ones, especially toward the 

 tips of the segments. Legs with the yellow integument showing in many 

 places; black erect scales at ends of femora, all of tibiae and apices of 

 tarsal joints, the tarsi, especially the hind pair, broadly white-ringed 

 at the bases. Wings with narrow brown scales, mixed with some whitish 

 ones along the costa. 



The larvae live in temporary rain-puddles, and are predaceous upon 

 the larvae of other mosquitoes with the same habit, either Psorophora 

 (subgenus Janthinosoma) or A'edes. The period of larval life is very 

 short. The winter is passed in the egg state, the eggs being spinose and 

 adapted to withstand dessication. The adult is a severe biter; but may 

 be classed otherwise as a beneficial insect, since its larva destroys many 

 other mosquito larvae. 



Distribution: Brazil to the eastern United States east of the plains 

 to northern New York. 



Canadian Records. 

 None. 



