th>> Bombi/Uitl FOUIKI <>f Houf/i Africa (Diptera). 135 



THYRIDANTHRAX LUGENS, Loe\v (1860). 



Closely allied to the preceding, but distinguished by its smaller 

 size, less intensive and somewhat different -wing pattern, and a different 

 aieuration, which agrees with that of lencoproctua and litiea. 



This South African species seems to be widely spread over the 

 region ; but can be easily mistaken for abrupt us if attention is n , >t. 

 given to the different venation ; the distinctive character, the wing 

 pattern, as established by Loew, is subject to some variation. 



The species seems to he rarer than the preceding ; in the collection 

 there are only two specimens from the Hex River (Cape), November, 

 1882 (L. Pi'riuguey), and from Klipfoiitein, Namaqualand (Cape), 

 November, 1885, from the same collector. 



The contact of the third posterior with the discoidal cell is almost 

 straight and only a little longer than that of the fourth. 



THYRIDANTHRAX CALOCHROMATTJS, sp. iiov., g . 



An elegant species of the fenestratus group, distinguished by the 

 very reduced dark markings of the wings and by the mainly yellow 



wmg-veins. 



Type <^. A single specimen from the Cape, without precise locality, 

 determined by Bigot as Anthrax calochromatus Big., but never 

 published; the name is here retained. The species is closely allied 

 to T. macquarti, Bezzi, but the wing pattern is more reduced, even 

 more than in T. elegatis or in T. polypliemus. 



Length of body 9 mm. ; of wing 9 mm. ; of wing spread 20 mm. 

 Head black, with the anterior part of the froiis and the whole face of 

 a yellowish red colour. Occiput moderately shiny, with scarce greyish 

 hairs above and with white scales at the eye borders ; central fringe 

 pale yellowish ; postvertical furrow less marked. Eyes with the upper 

 areolets not distinctly enlarged, the indentation faintly pronounced 

 and the bisecting line very short and less distinct. Frons at vertex 

 twice and more as broad as the less prominent, brownish-coloured 

 ocellar tubercle ; it is clothed with black hairs, which become pale 

 yellowish on the red part, and with whitish scales ; face with white 

 hairs on the sides and near the eyes and in the middle with Avhitish 

 scales ; it is rather conical in shape. Antennae with the two basal 

 joints yellow, the first with whitish hairs and above with a few black 

 ones; third joint wanting in the type. Genae rather broad, black 

 front, yellow behind like the mouth borders ; proboscis black, 

 as long as the mouth, with a yellow basal ring, palpi yellow- and 

 whitish-haired. Thorax black, rather shining, with sparse yellow scales 

 and with rather long yellowish hairs in front and on the sides ; bristles 



