NOTES ON THE DIFFERENT GENERA 571 



Sub-family. Culicinae. 



Genus. Mucidus, Theobald. 



"Mono. Culicid.,''' 1901, i, p. 268 ; 1910, v, p. 125. 



This genus is so far confined to Australia, West and Central Africa, India, East 

 Indies and Malay Peninsula. They are all large mosquitoes, easily told by the 

 whole body being more or less covered with long twisted scales, giving them a 

 mouldy appearance, and the legs densely scaled with outstanding scales ; the wings 

 with large parti-coloured scales. The Australian M. alternans, Walker, occurs in 

 larval form both in fresh and salt water. The adults bite man. 



Genus. Psorophora, Robineau Desvoidy. 



" Mem. de la Soc. d'Hist. nat. de Paris," 1827, iii, p. 412, R. Desvoidy ; " Mono. 

 Culicid.," 1901, i, p. 259; 1903, iii, p. 130; 1907, iv, p. 158 ; 1910, v, p. 123, Theobald. 



This genus is confined to the Americas and the West Indies. Several species 

 exist which can easily be told from Mucidus by the absence of long twisted scales 

 and the narrower wing scales. The legs are densely scaled and the thorax orna- 

 mented with flat spindle-shaped scales. 



P. ciliata, Robineau Desvoidy, occurs in both North and South America, and 

 bites man. 



Genus. Janthinosoma, Arribalzaga. 



"Dipt. Arg.,'' 1891, p. 52, Arribalzaga; "Mono. Culicid.," 1901, i, p. 253 ; 

 1903, iii, p. 124 ; 1907, iv, p. 152 ; and 1910, v, p. 118, Theobald. 



Hind legs only densely scaled ; some of the hind tarsi are always white. The 

 venation is as in Culex. The abdomen is metallic and iridescent. They all bite 

 man and occur only in the Americas and West Indies. 



Genus. Stegomyia, Theobald. 



" Mono. Culicid.," 1901, i, p. 283 ; 1903, iii, p. 130 ; 1907, iv, p. 170; 1910, v, p. 151. 



This, the most important genus in the Culicince, can be told by the head and 

 scutellum being clothed with flat scales and the thorax with narrow curved ones. 



About forty species are known in this genus, occurring in Southern Europe, Asia, 

 Africa, Australia, the Americas, East and West Indies, and on most oceanic islands. 

 Many of them seem to be vicious blood-suckers. They are mostly black and white 

 mosquitoes, and several seem to go by the name of tiger mosquitoes. The genus 

 contains the yellow fever mosquito (S. fasciata, Fabricius), the only one that need 

 be dealt with in detail here. The chief known species tabulate as follows : 

 A. Proboscis banded. 



a. Legs basally banded. 



Thorax brown, with scattered creamy-white 



scales ... ... ... ... ... annulirostris, Theobald. 



Thorax black, with narrow, curved golden 



scales periskelta, Giles. 



aa. Legs with basal and apical banding. Fore 

 legs with no bands ; mid with apical and 

 basal bands on first and second tarsals, 

 hind with basal bands. 



Thorax white in front, with a brown eye- 

 like spot on each side thomsoni t Theobald. 



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