ETHIOPIAN FRUIT-FLIES OF THE GENUS DACUS. 



95 



developed ; palpi pale yellow, antennae with the two basal joints dark yellow, the 

 third joint wanting. All the bristles of the head are black, and three pairs of 

 orbital bristles are present. Thorax unicolorous, the humeral calli and the scutellum 

 being only of a slightly lighter reddish colour ; the very narrow yellow mesopleural 

 stripe is placed along its distal border, extending only slightly on to sternopleura 

 below and on to the siitural callus above ; hypopleura unspotted ; the bristles black, 

 the anterior supra-alar well developed, the scapulars rudimentary, very thin, hardly 

 discernible. Halt^res whitish yellow. Abdomen almost spherical, of same colour and 

 punctuation as thorax, without yellow markings ; venter black ; of the ovipositor 



Fig. 9. Dacus xanthopterus, Bezzi, sp. n. 



there is only the basal segment, which is black and very swollen. Legs of a uniform 

 reddish colour, with white hairs and soft pubescence, only the basal joints of all 

 the tarsi being white. Wings long and broad, with the last portion of fourth vein 

 gently bisinuous ; they are hyaline, but the middle part from basal to hind cross-vein 

 and from costa to hind border, is suffused with a uniformly distributed yellowish 

 tinge ; the stigma honey-yellow ; there are two brown markings, a small spot at 

 the end of third vein and a broad streak on anal cell ; the marginal and submarginal 

 cells are not infuscated, only yellow, like the surrounding parts. 



Type $, a single specimen from Nyasaland, Mt. Mlanje, 24.vi.1913 (S. A. Neave). 



8. Tridacus humeraliSi sp. nov. (fig. 10). 



Apparently alhed to the preceding species, but very distinct on account of the 

 spotted face, the yellow spots on shoulders and hypopleura, and the different colour 

 of the legs and wings. 



cJ. Length of body, 8-5-9 mm. ; length of wing, 7-7*5 mm. ; breadth of wing, 

 2-2-2-5 mm. 



Body punctulate, of a blackish brown colour, with yellow markings, less pubescent 

 than the preceding species. Head yellow ; occiput reddish brown, bordered with 

 yellow ; frontal band with a rounded central dark spot and four black dots on each 

 side, the last of which are placed on the vertex, where there is also a black dot ; facial 

 black spots of triangular shape, with the lower angle directed inwards to the 

 mouth-edge ; a blackish spot below the eye. Antennae long and geniculate, of a 

 brownish red colour, but the third joint blackish ; palpi reddish yellow ; bristles 

 black and strong, three pairs of orbitals. Thorax black on the disk, with three 



