38-2 GNATS OR MOSQUITOES — CHAPTER XIII 



pleurae brown, brindled with white scales. Lej^s nearly black, except 

 the under sides of the femora. Halteres yellowish. Length. — 4 to 

 4"8 inra. 



Habitat. — Upper Burmah, Sumatra. 



19. STEGOMYIA IRRITANS, Theobald. 



(Report Liverpool School Tropical Medicine, 1901). 

 Plate xiv, fig. 21, Head and appendages of ^ . 



Wings clothed with uniformly black scales. Tarsi unhanded. 

 Thorax unadorned black. Abdomen black, with minute basal 

 white bands on some of the anterior segments. 



Closely resembles S. hrevipalpls milil, but the $ palpi are at least 

 as long as the proboscis, and his antennae are proportionally very short, 

 instead of being well nigh as long as tlie palpi, or proboscis. 



5. — Head covered with flat creamy- grey and black scales, the black 

 ones forming a more or less triangular patch on each side, and a small 

 area in the middle, a few scattered black upright fork scales over the 

 occiput, around the eyes a narrow line of cm-ved golden scales ; clypeus 

 black, apparently nude ; palpi testaceous, with dark scales ; anterma^ 

 dark brown, with narrow pale bands, basal joint half testaceous, the 

 inner half darker, base of the second joint testaceous, basal joint with 

 a few small scales on the inner side and minute curved hairs ; proboscis 

 deep brown ; eyes black and golden. PleuriE brown, with large creamy 

 patches. Legs nearly black, grey on the coxee and under-sides of the 

 femora ; tarsal claws symmetrical ; the fore and mid feet each with an 

 extra tooth, the hind simple. Halteres yellow, with white scales on 

 the knobs. Venter whitish, with narrow black hinder border to the 

 segments. Length. — 4 mm. 



Habitat. — Bonny, West Africa. 



20. STEGOMYIA ARGENTIOPUNGTATA, Theobald. 



(Mouog. I, p. 31G). 



Veins of wings with brown scales. Tarsi unhanded, nearly 

 black. Thorax black-grounded, clothed with very long and 

 narrow, umber-brown scales, decorated with six patches of flat 

 white scales, four in front and two more at the sides behind. 

 Abdominal segments nearly black, with small basal lateral white 

 spots and yellow side bristles, venter dark brown. Proboscis 

 unhanded, brown, but black at tip. 



Head black, with numerous small white spots ; the clypeus black. 

 Antennae brown, a few black scales on second joint ; palpi of J brown, 

 those of ^ also brown, and unhanded, exceeding the proboscis in length 

 by more than its last joint, which is equal to the next, both being so small 



