96 PROF. M. BEZZI, 



more or less distinct longitudinal stripes and the sides reddish brown ; humeri reddish, 

 with a less distinct yellow spot on the front corner ; behind the suture there are three 

 yellow stripes, the middle one much abbreviated ; mesopleural stripe rather broad, 

 not produced along the suture, but margined anteriorly with a broad black band, 

 which shows whitish reflexions, the rest of the pleurae being of a reddish colour ; 

 hypopleural spot rather small and margined with black ; mesophragma black, with 

 a reddish longitudinal stripe. Scutellum yellow with black base ; halteres whitish. 

 All the bristles are strong and black ; anterior supra-alar well developed ; the 

 four scapular bristles very long and strong. Abdomen Hke the thorax, but the second 



Fig. 10. Dacus humeralis, Bezzi, sp. n. 



segment almost entirelyjreddish and the middle part of fourth and fifth more or 

 less broadly reddish yellow ; venter greyish ; third segment with a row of black 

 bristles extending from the venter half-way to the middle of the dorsum. Legs 

 reddish brown, the bases of hind femora broadly and the bases of all the tarsi whitish. 

 Wings hyaline ; the stigma and a narrow band filhng the marginal and submarginal 

 cells are yellow, becoming darker brown at the end of the submarginal, but not 

 forming a definite spot ; small cross- vein Hghtly margined with yellowish ; anal 

 brown band rather broad ; last portion of fourth vein distinctly bisinuous. 



^JV^ S ^^^ ^n additional specimen of the same sex from Southern Nigeria, 

 Oshogbo, xi.l910 {Dr. T. F. G. Mayer). 



9. Tridacus disjunctus, sp. nov. (figs. 11, 12). 



A very distinct species characterised by the two small and broadly separated 

 hypopleural spots, in which perhaps it shows affinity with flavicrus, Graham, from 

 Ashanti, but from which it differs in the leg coloration. 



$. Length of body, 8-8-5 mm. ; length of wing, 7-7*2 mm. ; breadth of wing, 

 2*5 mm. 



Body blackish brown, punctulate, with sparse and short light yellow pubescence ; 

 the yellow markings are well developed and very striking. Head yellow, but the 

 occiput black, with a broad yellow border ; frontal band with a broad black spot in 

 the middle, three pairs of orbital dots and a transverse stripe on the vertex ; facial 

 black spots very small, not rounded, almost Hnear, placed obliquely and extended 

 inwards to the mouth- edge ; palpi yellow ; antennae rather short, with the third 

 joint entirely yellowish ; all the bristles black, three pairs of orbitals present. Thorax 

 black, even on the pleurae, only slightly reddish on the sides behind the suture ; 

 humeri yellow, but margined with black above and below ; three postsutural narrow 



