CULICIDJ5: CULICALES, MEGALORRHINI, ETC. 109 



black — and are not stacked in rafts. The larvae, so far as 

 they are known, are also much pigmented, have a short 

 breathing-tube, and very large tracheal gills, and can live in 

 water however foul, scanty, and precarious. 



The notorious species in this genus is Siegomyia fasciata, 

 Fabr., which, besides being the intermediate host of Filaria, 

 was by Finlay discovered to be the nurse of the still 

 mysterious (probably Protozoon) causative of yellow fever. 

 Recently, moreover, Wenyon has discovered that in Baghdad 

 Stegomyia fasciata is probably the intermediate host of the 

 Protozoon parasite of the Baghdad sore. 



Other species causally connected with disease are 

 Stegomyia pseudoscutellaris, which Bahr has found to be an 

 intermediate host oS. Filaria bancrofti'm Fiji. 



Stegomyia fasciata, Fabr. (Fig. 20). 



Adult female. — Head black, with white markings disposed 

 somewhat in the shape of a crown ; palpi short, black tipped 



Fig. 20. — Sfefifomyia/oseiata, female. 



with white, or entirely white. Scutum brown, with a large 

 lyre-shaped device, the broad limbs of the lyre snow-white, 

 the two strings yellowish-white. Scutellum white. Abdomen 

 blackish-brown, with white bands across the dorsum and 

 white patches on the sides of the segments. Femora with 

 white tip, most distinct in the hind legs ; tibiae black, tarsus 

 of front and middle legs with two white bands, tarsus of hind 

 legs with five white bands, the last of which includes the 

 whole of the terminal segment. 



