NOTES ON THE ETHIOPIAN FRUIT-FLIES — I. 239 



hind cross-vein. The discoidal cell is almost rectangular in shape, its basal vein 

 being about as long as the apical one ; the small cross- vein is placed a little before its 

 middle. 



Type $ (British Museum), a single specimen from Gold Coast, Aburi, 1912-13 

 (W. H. Patterson). 



6. Trirhithrum occipitale, sp. nov. (Plate v, fig. 7). 



A very distinct species, being somewhat allied to the two preceding ones on account 

 of the black pubescence of the thorax, but distinguished from all the known species 

 by the bright reddish occiput. 



5 Length of body, 4 mm. ; of ovipositor, 1 mm. ; of wing, 4 mm. 



Occiput reddish, bright ferruginous on the lower swellings, with a dark brown spot 

 on each side of middle ; frons bright reddish yellow, without any dark pattern, except 

 the black ocellar spot ; face entirely cream- white, only narrowly infuscated above 

 near the roots of antennae ; the exceedingly narrow cheeks and the rather narrow 

 jowls are of the colour of the occipital swellings, with a purplish spot below the eye. 

 Antennae entirely dark reddish, with broadly plumose arista. Proboscis black ; 

 palpi greyish, with black bristles. All the cephalic bristles are black, but less stout 

 than in the preceding species, chiefly the oc. Thorax entirely shining yellowish 

 even on the humeri and pleurae ; the pubescence on back and the hairs on pleurae 

 black, like the bristles ; chaetotaxy as in the preceding, but all the bristles weaker. 

 Scutellum and mesophragma, like the thorax and even -the hypopleura, quite black ; 

 4 set. Halteres black, with paler stalk, which at base is more yellowish. Abdomen 

 shining black, with black hairs and bristles ; first segment with a narrow whitish 

 hind border, which is interrupted in the middle ; 2nd and 3rd segment with a 

 double greyish spot in the middle, more developed and distinctly triangular on the 

 third. Ovipositor as in the preceding. Legs black, the tibiae and all the tarsi at end 

 pale yellowish ; hind tibiae with a complete row of short bristles. Wing pattern 

 blackish ; a great triangular hyaline indentation with the base on the costal cell and 

 the apex in the first basal cell ; a broad border of the axillary lobe and the alula 

 are greyish hyaline ; there is also a hyaline spot near the base of the anal cell. 

 Costal vein yellowish along the hyaline indentation ; stigma blackish. Marginal 

 band with four broad hyaline streaks along the costa ; middle band reduced to a 

 well developed tooth ; cubital band as broad as the length of the small cross-vein 

 and entirely covering the hind cross-vein ; the hyaline space between the marginal 

 and the cubital bands with acute end and not reaching the small cross- vein ; basal 

 band ending rather narrowly at end of the anal vein. Discoidal cell narrower at 

 base than at end, the small cross- vein placed much before its middle ; lower point 

 of the anal cell longer than the second basal cell. 



Type $ (British Museum), a single specimen from Nyasaland, Limbe, 4,000 ft., 

 22nd September 1916 {R C. Woody 



7. Trirhithrum bimaculatum, v. Roder, Berl. ent. Zeits., xxix, 1885, p. 135. 

 Originally described from Delagoa Bay and not found subsequently. It is said 



to have only 2 set., a thing which seems probably due to the fact that a pair of 

 bristles was accidentallv broken off. 



