A NEW STEGOMYIA FROM THE TRANSVAAL. 225 



just before the roots of the wings, and a small white median spot near 

 the head, from which run two parallel dull yellow median lines to the 

 bare space in front of the scutellum, and a short silvery line on each 

 side over the roots of the wings ; the sides of the bare space in front 

 of the scutellum bordered with white. Prothoracic lobes with flat 

 white scales. Scutellum with the large median lobe black-scaled, with 

 a prominent border of silvery-white ones, lateral lobes with large flat 

 white scales, border-bristles brown. Metanotum deep brown. Pleurae 

 deep brown with prominent silvery-white puncta. Abdomen deep 

 blackish-brown with silvery-white basal bauds, except the first segment, 

 which is all deep brown with pallid bristles, large basal lateral white 

 spots to each segment ; posterior border-bristles brown, inconspicuous. 

 Legs with the anterior femora and tibia? black, metatarsus and first 

 tarsal with broad basal white bands, last three tarsi black, a trace of a 

 pale basal area on the tibia ; in the mid legs the femora are pale at the 

 base and have a small round white spot towards the apex which is 

 white, remainder as in the fore legs ; hind legs with the femora white 

 along the basal half, an oval elongate silvery-white spot towards the 

 apex, the latter snowy white, base of metatarsus and first and second 

 tarsi broadly white-banded, third tarsus all black, fourth pure white. 

 Ungues all equal and simple. Wings with the first submarginal cell 

 louger and narrower than the second posterior cell, its base nearer the 

 base of the wing than that of the second posterior, its stem about one- 

 third the length of the cell, stem of the second posterior cell about as 

 long as the cell ; posterior cross-vein about two and a half times its 

 own length distant from the mid cross- vein ; the median vein- scales 

 on the fifth, where the branch arises, in two prominent lines. Halteres 

 with pallid base and dusky scaled knobs. Length, 3 # 5-4-5 mm. 



$ . Thoracic adornment similar to that of the female. Palpi 

 black with a white patch at the base of the two apical segments on one 

 side only, that at the base of the apical one largest, and a broader 

 white band towards the base, and another small one still nearer the 

 base ; the two apical segments nearly equal, the apical one slightly the 

 shorter, both and the apex of the antepenultimate with long scattered 

 brown hairs, apical segment rounded at the tip. Antennas with deep 

 brown plume hairs and pale internodes. Abdomen and legs as in the 

 female. Fore and mid ungues unequal, simple, the larger one in the 

 fore pair rather more curved than the larger of the mid ; the hind pair 

 small, thick, curved, and equal. Claspers of male genitalia shortish 

 and rather broad, straight on one side, curved on the other, with a 

 very small nearly terminal dark process ; between the basal lobes a 

 large spine with expanded base. Length, 3'5-4,'5 mm. 



Habitat. — Transvaal (collected by Mr. Simpson, Government 

 Entomologist). 



Observations. — Evidently common from the large number 

 sent in a collection forwarded by Mr. Simpson. It superficially 

 resembles S. fasciata, but the thoracic ornamentation, the simple 

 female ungues, the different adornment of the male palpi at 

 once separate it. The female palpi are composed of three 

 segments, of which the apical is very marked, being suddenly 

 contracted at the tip and ends in a round truncated surface. 



