14 PROF. M. BEZZI. 



2(3). Mouth-border yellow like the face ; mesophragma yellow, with a black 

 stripe ; wings with only two hyaline spots at fore border and with the 

 lower apical angle of the discoidal cell hyaline. . . . pennata, Speis. 



3(2). Mouth-border with a black stripe ; mesophragma shining black ; wings 

 with 4—5 hyaline costal spots and with the discoidal cell wholly infuscated. 



woodi, sp. n. 



4(1). Macrochaetae quite black ; antennae only half as long as the face ; legs 

 more slender, with the front femora not bristly beneath ; wings broader 

 and shorter than the body, with a rather distinct costal bristle, a short 

 stigma and the point of the anal cell not long. . . . gracilis, Loew. 



1. Ocnerioxa pennata, Speiser, Deut. Ent. Zeits., 1915, p. 103. 



This species is very like the following one, but may be distinguished by the entirely 

 yellow frons and face, and by the somewhat different wing pattern 



Originally described from N. Kamerun, Mubi, near Jarua. I have before me a 

 cotypical male specimen received from the author. 



2. Ocnerioxa woodi, sp. nov. (PI. i, fig. 1). 

 A beautiful fly of strange coloration. 



<J$. Length of body, 4 '5-5 mm. ; of the ovipositor, 12 mm. ; of the wing, 

 5-6 mm. 



Head of a pale yellowish colour ; occiput shining, with 4 black stripes radiating 

 from the neck to the vertical bristles and to below the middle of eyes ; ocellar 

 dot black ; frons opaque, shining at vertex and on the basal stripes, and above the 

 lunula with a more or less broad, black, transverse band ; along the upper mouth- 

 border there is a very striking, black stripe ; jowls with fuscous subocular patch. 

 Antennae entirely of a pale yellowish colour, like the palpi and the proboscis, but the 

 third joint is a little infuscated. The occipital swellings are paler, almost whitish, 

 clothed with pale yellowish hairs. All the bristles are yellow, only the outer vt. 

 and those of the rather strong occipital row being black. Thorax on the back of 

 a light whitish-yellow colour, less shining and with pale pubescence ; on the sides 

 it is adorned with 4 parallel, black stripes, 2 on each side, the interior going from 

 above the humeri to the lateral angles of the scutellum, the outer along the noto- 

 pleural line to the root of the wings ; the former of these stripes is in continuation 

 with the horizontal streak of the occiput. Pleurae of a much paler, yellowish-green 

 colour, not spotted, with a whitish pubescence beneath ; mesophragma quite shining 

 black. All the bristles are yellow, sometimes infuscated at end ; the st, is quite 

 white. Scutellum of a lighter colour than the back of thorax, and with yellow 

 bristles. Halteres pale yellow. Abdomen of oval shape, more shining than the 

 thorax, with yellowish pubescence and black bristles ; it is of a yellowish-green 

 colour, in the male the elongate 4th segment being entirely black and shining, in 

 the female the segments 3-5 having a black spot on each side and the second having 

 a narrow black hind border. Venter greenish yellow ; ovipositor entirely reddish. 

 Legs entirely pale yellow, with pale pubescence and yellowish bristles, even the 

 terminal spur of the middle tibiae being yellowish ; claws black. Wings wholly 

 infuscated ; along the fore border there are 3 small elongate hyaline spots in the 



