﻿On ihe BomJnjliid Fainut <>/ Soiifh Africa CDiptera). 135 



Thyridanthrax lugens, Loew (1860). 



Closely allied to the precediiio-, but <listingiiislied by its smaller 

 ■size, less intensive and somewhat ditt'erent wing pattern, and a different 

 iieuration, which agrees Avith that of lencoproctus and liaea. 



This South African species seems to be widely spread over the 

 region; but can be easily mistaken for abricpfiifi if attention is not 

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

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



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

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

 1882 (L. Pcringuey), and from Klipfontein, Naniaqualand (Cape), 

 November, 1885, from the same collector. 



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

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



Thyridanthrax calochromatus, sp. nov., (^ . 



An elegant species of the feuesfrafKs group, distinguished by the 

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

 wing-veins. 



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

 determined by Bigot as Anthra.v calochromatus Big., l)ut never 

 pu I dished; the name is here retained. The species is closely allied 

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

 more than in T. elegans or in T. pvh/i^hemiis. 



Length of l)ody 9 mm. ; of wing 9 mm. ; of wing spread 20 mm. 

 Head black, with the anterior part of the frons 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 

 ai'eolets not distinctly enlai"ged, the indentation faintly pronounced 

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

 twice and nioi'e as l)road as the less prominent, brownish-coloured 

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

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

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

 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. Clenae rather broad, black 

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

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

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

 and with rather lontj vellowish hairs in front and on the sides ; bristles 



