218 F. W. EDWARDS. 



Mediterranean specimens of both 0. dorsalis and 0. salinus are usually much lighter 

 in colour than British examples, but there is no difference in the genitalia. I cannot 

 agree with Gough that Linnaeus' C'uhx aegypti is 0. dorsalis ; the description seems to 

 me to indicate quite clearly some species of Stegomyia. 



Ochlerotatus fryeri, Theo. (fig. 7 b). 



Cidicelsafn/eri, Theo., Trans. Linn. Soc. xv., p. 84 (1912). 



I have previously given this as a synonym of 0. nigeriensis (Theo.), but closer 

 examination of the type with fresh material received from Mombasa, British E. Africa 

 {Dr. J. 0. Sliircore), and Magogoni swamp, near Witu, British E. Africa {S. A. Neave), 

 shows that it is really distinct. The chief difference is to be found in the male genitalia, 

 the claspers being quite unlike those of 0. nigeriensis, 0. sudanensis or 0. durhanensis ; 

 a figure is given herewith. The side-pieces are very stout, their basal lobes being 

 developed into small harpagones which have a short straight terminal spine. Apart 

 from this the species, though rather smaller than 0. nigeriensis, is of a distinctly 

 stouter build ; the sixth tergite of the female abdomen has a narrow pale apical line 

 instead of an apical pair of pale spots, and the basal white bands on the sixth and 

 seventh tergites tend to spread out backwards in the middle line, which is not the 

 case in 0. nigeriensis. Both species occur in East Africa, 0. nigeriensis having been 

 received from Zanzibar {Dr. W. M. Aders) and Nyasaland {S. A. Neav^, Dr. R. Bury). 



Ochlerotatus vexans, Mg. 



Culex vexans, Meigen, Syst. Beschr. vi, p. 241 (1830). 



Culex artictdatiis, Bond., Bull. Soc. Ent. It. iv, p. 30 (1872). 



Culex sylvestris, Theo., Mon. Cul. i, p. 406 (1901). 



Culex vagans, Theo., Mon. Cul. i, p. 411 (1901). 



Culicada nipponii, Theo., Mon. Cul. iv, p. 337 (1907). 



Cidicada minuta, Theo., Mon. Cul. iv, p. 338 (1907). 



Cidex stenoetrns, Theo., Mon. Cul. iv, p. 395 (1907). 



Cidicada enithrosops, Theo., Mon. Cul. v, p. 299 (1910). 



Culex pseudostenoetrus, Theo., Mon. Cul. v, p. 343 (1910). 



? Culex nocturnus, Theo., Mon. Cul. iii, p. 159 (1903). 



Culex hirsutum,, Ludlow, Psyche, xviii, p. 126 (1911). 



I have compared mounts of the genitalia of specimens from Canada, England, India, 

 and Ceylon, and find them absolutely identical. Ficalbi's figure, which has been 

 copied by Theobald and Kertesz, is rather inaccurate, the structure being better 

 represented in the figure given by Howard, Dyar and. Knab (Plate 34, fig. 225) ; 

 even this, however, is not quite correct, the shape of the clasper agreeing with the 

 Afi'ican 0. dentatus as figured by me (Bull. Ent. Res. v, p. 277, 1915). 0. dentatus, 

 however, must be distinct from 0. vexans, as the tarsi are entirely dark, and there are 

 slight differences in the basal parts of the genitalia. I have not seen a male of 

 0. nocturnus, but have included it with some doubt in the synonymy, as the females 

 appear to agree closely with the Oriental form of this species. 



It is extremely remarkable that a non-domestic mosquito should have such a wide 

 range as 0. vexans apparently has, extending over North America, Europe, China, 



