NEW ETHIOPIAN FRUIT-FLIES. 179 



broadly shaded to form a dark border around the second basal cell ; the anal cell 

 and the anal vein are quite unspotted. There is sometimes a very faintly 

 developed greyish shading at the end of the 5th longitudinal vein, below the lower 

 apical corner of the discoidal cell. 



Type $, and an additional specimen of the same sex, in the British Museum from 

 British East Africa, Kabete, 28.viii.1914 (T. J. Anderson). 



Genus Dacus, s. str., Bezzi, 1915. 



2. Dacus trigonus, sp. nov. (fig. 2). 



Falling like hamatus, into section 25 of my Key (I.e., p. 90), but distinguished by 

 the broad, triangular, fuscous patch on the middle of the wings, as well by the smal 

 cross-vein being placed much beyond the middle of the discoidal cell. 



<J. Length of body, 6 '2 mm. ; length of wing, 5 mm. Body entirely black, with 

 proportionally narrow, but striking, yellow markings. Head entirely shining black, 

 with very small yellow markings, as follows : a very narrow stripe along the ocular 

 border of the occiput ; a transverse spot on the upper border of the occiput, just 

 beneath and below the vertex ; a transverse band near the base of the frons in front 

 of the ocelli, broadly interrupted in the middle ; two narrow streaks on each side of 



Fig. 2. Dacus trigonus, Bezzi, sp. n. 



the frons near the eyes ; a narrow border on each side of the face, in contact with 

 the somewhat brownish cheeks. The frons on the middle is of a dark reddish-brown 

 colour, and shining ; the lunula is black ; the face is quite black and glistening. 

 Antennae very long, the first joint being porrect and about as long as the second ; 

 they are entirely blackish brown, the second joint being a little reddish below ; arista 

 black, with yellowish base. Palpi blackish brown, with a narrow yellowish border ; 

 proboscis black, with a dirty yellowish tip. The eyes aTe black on the hind half, 

 with a perpendicular reddish stripe in front, and reddish on the fore half. The 

 cephahc bristles are of a deep black colour ; there are only two pairs of rather short 

 lower orbital bristles. Thorax entirely black, punctate, rather opaque ; on the 

 disc of mesonotum there are two indistinct, broad, greyish, longitudinal stripes, 

 enclosing a black middle stripe, which beyond the suture is divided to include a short 

 yellow streak, ending much before the scutellum. Humeral calli shining black, with 

 a rounded, pale yellowish, prominent spot on the hind half. Pleurae with a broad 

 perpendicular stripe on the meso- and pteropleura, united above with a small yellow 

 dot on sutural callus at the sides of the suture, and continued below with a small spot 

 on the upper part of the sternopleura. The single yellow hypopleural spot is rather 

 small, rounded, occupying only a part of the hypopleura. Scutellum yellow, with a 

 narrow black basal stripe. Mesophragma entirely black, rather shining. The dust 

 (C507) a2 



