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sea-coast, curriei breeds in temporary pools of snow-water or rain-water on the 

 prairies. The American authors suppose, as Meigens specimens of C. dorsalis derive 

 from Berlin (freshwater), and subsequent authors (St.eger, Meinert, Theobald a. o.), 

 state that it breeds in brackish water, that also in Europe we possess two species, 

 the relations of which cannot be cleared up before the larvae have been studied. 



C. dorsalis was described by Meigen, but already in 1771 Pallas described 

 a species from the Caspian which is most probably identic with the above-named; 

 it has been deemed necessary to revive the ancient name 0. caspius. As C. dorsalis 

 it has been indicated by St.eger in Denmark, by Zetterstedt in Sweden, by 

 Schiner in Austria, bei van der Wulp in Holland and by Ficalbi in Italy; 

 it was last found by Eckstein near Strassbourg. The Danish specimens are much 

 more in accordance with the description of Meigen and Zetterstedt than with 

 the later one by Theobald. The larva has only been described by Eckstein 

 (1919 p. 293). He says that the larva very much resembles that of C. nemorosus 

 and C. cantans. "Die Striegelborsten am 8 Segment, etwa 25, haben ebenso wie die 

 der C. 7!e;»o/'osHs-Larva lauter fast gleichlange Zahnehen, doch ist der mittlere 

 meist ein wenig verdickt. Dagegen feb.11 ihnen das Basalblattehen das fur C. nemo- 

 rosa so characteristisch ist". 



With regard to the biology of the European C. dorsalis we do not know much. 

 Pifeard (1895 p. 227) states that at Aldeburgh on the Suffolk coast it is known 

 as the Norway mosquito, having lived here for at least the last twenty-five years. 

 "A tradition" says Piffard "assigns its introduction to a particular yacht, which 

 used to ply between this port and Norway". Also in Sweden (Lund-Lomma) and 

 in Norway (Christiania) as well as in Denmark it is restricted to brackish-water 

 pools near the sea-shore. Later on, in a paper which I have not been able to con- 

 sult, Dyar and Knab (Insec. Inscit. 1917 p. 122) have maintained that the descrip- 

 tion of O. curriei larva in the monograph (Howard, Dyar and Knab) was founded 

 on a misidentilied species of 0, canadensis. The correct description of the species is 

 under onondagensis (ace. to letter from Mr. Edwards S2 / 4 1920). As the American 

 authors, as stated above, have got material of 0. caspius from the Royal Museum 

 of Copenhagen (1917 p. 634), and all this material derived from Amager, they have 

 determined the specimens from this locality, where the species still lives, as 0. cas- 

 pius; later on Edwards has done the same. According to me this material is homo- 

 genous, but on the authority of Mr. Edwards and in accordance with him and Mr. 

 Lang I have separated the specimens with thorax without brown coloration and 

 with broad white bands on mesothorax from 0. caspius as 0. curriei (Coquillet). 

 Of the American species, which seem to be either identic with the two above-named 

 European species or at all events very closely related to them, A. onondagensis lives 

 as larva on the flat marshes of the Pacific coast in pools of salt water, left by high 

 tides: a set of larva' appear after each high tide. Quayle (H. D. K. 1917 p. 632) 

 lias given a description of their life. .4. curriei inhabits the open arid country; the 

 larvae live in temporary pools. In the north there is but a single annual generation 



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