3. OXYCERA 105 



S . Face and f rons forming a small shining black triangle, but there are very 

 indistinct narrow yellowish eyemargins about the middle of the face ; face 

 with inconspicuous though not scarce short pale greyish pubescence, which is 

 continued on over the very shallow space under the eyes to the longer whiter 

 pubescence on the jowls and lower part of the back of the head ; lower part 

 of the back of the head shining black and but little puffed out, while the 

 upper part is flush with the eyes and bears only very short dark pubescence ; 

 vertex shining black, long and pointed, and with some very short black 

 pubescence behind the ocelli ; frons bare and with a middle channel. Eyes 

 touching for nearly half the distance between the occiput and the antennte, 

 clothed with short dense dark pubescence on the large facets but with still 

 shorter and sparser pubescence on the small facets • facets on the large upper 

 part large and pale brown, abruptly contrasted with the small blackish brown 

 facets on the smaller lower part. Antenna; short, brown ; arista long, being 

 as long as the whole antenna. 



Thorax shining black, with a yellow line running from the humeri to 

 beneath the wing-base and thence on vaguely to the end of the pleurae ; 

 postalar calli yellow ; pubescence rather short and mainly black, but longer 

 and greyer about the sides above the suture, fairly dense ; pleurae with longer, 

 whiter, and much more conspicuous pubescence, but bare and polished on the 

 usual depressed middle part of the mesopleurse. Scutellum yellow with just 

 the basal corners black, and with the long spines yellow but sometimes black 

 at the tip; pubescence very short and inconspicuous, pale unless on the 

 extreme basal margin; metanotum shining black. 



Abdomen shining black with yellow side-markings and tip, densely 

 punctate on the two basal segments and on the disc of the third and fourth ; 

 at each hind corner of the third segment there is a comparatively small 

 triangular yellow spot, which only touches the hindmargin at the extreme side, 

 and which extends on to the upper corner of the fourth segment and is 

 narrowly connected along the sidemargin with a similar spot at each hind 

 corner of the fourth segment ; this latter pair of spots may extend vaguely 

 consideral)ly upwards on to the disc, and they are very narrowly connected on 

 the actual sidemargin with the large apical spot, and this latter spot occupies 

 all the middle part and end of the last segment; pubescence moderately 

 long and greyish about the sides of the two basal segments but not very con- 

 spicuous, and very short, stubby, depressed, and black on the rest until it 

 becomes greyish after the middle of the fourth segment and on to the tip. 

 Belly shining black, with short rather sparse pale pubescence. Genitalia 

 blackish, but the small terminal lamellae brownish yellow. 



Legs nearly all rather dull yellowish, but the hind femora considerably 

 obscured even to an indication of a dark ring after the middle, while the hind 

 tibiae may be similarly darkened ; coxae and trochanters mainly blackish ; front 

 tarsi blackened except on the under side of the basal joint, and the posterior 

 tarsi with the last three joints blackened. Pubescence practically reduced to 

 a slight pale fringe behind the anterior femora. 



Wings slightly brownish, but more notably so from the base to the end of 

 the cubital cell but not including the veins which margin the outer end of the 

 discal cell ; cubital fork short but distinct, leaving the cubital cell about half 

 as long as the submarginal. Squamae (alar) small, smoky with blackened 

 margins and pale fringes ; thoracal squamaj absent, but the end of the frenuni 

 near the angle with a pale fringe. Halteres dull clear orange with just the 

 base of the stem darkened. 



? . Frons distinctly more than one-third the width of the head, and the space 

 between the eyes very faintly widening from the vertex to the mouth, brightly 

 shining black with variable whitish or orange markings ; there is always a 

 conspicuous large white or yellow spot (varying somewhat in size and colour) on 

 the postocular collar against the top angle of each eye, and lower down onthe 

 frons are two spots beginning just below the ocelli and well away from the sides 

 which may extend downwards irregularly until they spread outwards at then- 

 lower end and quite (or almost) connect with the pale sides of the face, or they 

 may be less extended and broken into two pairs of rounded spots which may be 

 even small and widely separated, but still the lower spots are almost connected 



