376 GNATS on MOSQUITOES — CHAPTER XIII 



intensely purple-black scales with brilliant white lateral spots 

 iind a narrow row of brownish scales across their hinder borders ; 

 on flexion narrow basal white bands become visible. Proboscis 

 uniformly black. 



? . — Head black, with a narrow patch of white scales in the middle ; 

 palpi black, with white scales at the tip, and a few long bristles ; pro- 

 boscis black, antennie dark brown ; basal joint black, with a tuft of 

 white scales, forming two white spots just below the eyes, and on each 

 side of a small tuft of white down projecting between the eyes, which 

 are black and reddish, with a very narrow border of white scales. 

 Scutellum dark, with a few white scales ; pleursE with silvery dots. 

 Legs dark brown. "Wings with "4" far internal to " 3 " and I. much 

 curved. LeiigUi. — 4'5 mm. 



Habitat. — Bonny, West Africa; November (described from a 

 single ?). 



8. STEGOMYIA MARSHALLII, Theobald (Monog. I, p. 310). 



Veins of wings with brown scales, a patch of white at base 

 of costa in (? only. Last hind tarsal joints pure white, the other 

 joints with snowy apical bands; mid and fore tarsi with an 

 apical white band on the first joint only. Thorax dark grounded, 

 clothed with narrow curved, chestnut scales, with four distinct 

 white spots in front and two, less conspicuous, behind. Abdo- 

 minal segments dark brown, ochreous behind with lateral silvery 

 spots in the $ , or with white basal bands to third, fourth and 

 eighth segments and broad lateral spots on fifth, sixth and 

 seventh. Proboscis unhanded. Ditfers from S. vUtahis in the 

 tarsal bands being apical. 



? . — Head black, covered with bronzy-black scales in the middle, 

 two silvery-white patches in front on each side divided by a dull purplish 

 and dusky ochreous mass of tlat scales : beliind are some grey curved 

 scales and numerous upright black forked ones ; palpi short, covered 

 with deep brown scales. 



^ , — Palpi brown, with three pale rings, the two apical ones on the 

 bases of the two last joints, the last two joints are short, about equal, 

 and together not much more than half the length of the third jomt. 

 Pleurai marbled with white, ferruginous, and brown scales ; scutellum 

 brown with flat silvery scalps. Legs dark brown with minute white 

 knee-spots, and subapical white dots on the fore and mid femora. Tibite, 

 all with an apical snowy spot in front. All tarsal claws of <? witli an 

 accessory tooth very unequal on fore and mid feet ; of ? equal with an 

 accessory tooth to the thick, blunt fore claws only. Halteres yellowish 

 with darker Imobs. Length. — 3*5 to 4 mm. 



Hafciffl^— Salisbury (4,000 feet), Mashonaland. 



