244 PROP. Mi BEZZI. 



long and rough hairs which cover the whole frontal stripe ; these hairs in the male 

 are irregularly disposed in four, in the female in eight rows. Lunula very broad, 

 rounded above, clothed on the sides with hairs like those of the frontal stripe ; it is 

 moreover clothed with shining white dust, the contrast between it and the deep 

 black frons being in certain lights very striking, chiefly in the male. Cheeks about 

 as broad as the breadth of the third antennal joint, and clothed with greyish dust, 

 which is chiefly shining white in the male ; jowls about one-third of the height of 

 the eye, clothed with black hairs, which are longer on the lower part of the occiput. 

 Face flat, not at all prominent at the mouth-border, clothed with greyish dust and 

 shining white in the male ; it has along the middle a distinct, vertical keel, which 

 is not visible in the allied species, in which the broad prominence between the antennal 

 grooves is flat or even furrowed in the middle. Antennae widely separated at base, 

 quite black and very short ; the third joint is about as long as the previous one and 

 is rounded at the tip, which does not extend below the middle of the face ; second 

 joint with some bristly hairs at the end above, one of which is very long ; arista 

 bare, black, thickened at the base. Eyes reddish brown, higher than broad, wholly 

 clothed with greyish hairs, which are longer in the male. Mouth-opening rather 

 narrow ; there is a pair of distinct vibrissae, curved upwards ; labium not prominent, 

 never distinguishable ; proboscis and palpi short, the latter black and broadened 

 at the end. Thorax shining black, with more or less distinct aeneous reflections 

 on the back, which is only very faintly dusted ; the hairs of the back are rather long, 

 black, the acrostichal ones being disposed in four rows on each side. The macro- 

 chaetae are black ; there is only a pair of not very strong dorsocentrals ; the meso- 

 pleura is hairy only in the middle, with some bristly hairs on the fore border, and 

 with 3-4 long bristles at the hind border ; the sternopleura has a single bristle at its 

 upper posterior corner. Scutellum coloured like the back of mesonotum and not 

 more dusted than it ; it is quite bare, except for the usual four bristles. Post- 

 scutellum and mesophragma shining black, but with a distinct, dark greyish dust. 

 Squamulae of proportionally greater size, whitish, with a yellowish pale-fringed 

 border. Halteres black, with yellowish stalk. Abdomen of a broad oval shape in 

 the female, more elongate in the male ; it is shining black, with aeneous reflections 

 and very faintly dusted ; it is clothed with black hairs, and bears short thin black 

 bristles near the sides at the hind border of the segments. The venter is entirely 

 black, dark grey dusted and black-haired. Last abdominal segment of the male about 

 1-| times as long as the preceding segment, rounded at hind border and there not 

 specially setose ; male genitalia small, rounded, black, not prominent ; ovipositor 

 shining black ; if completely exserted, it is 1'5 mm. long. Legs black, black pilose 

 and black setose ; on the front pair the praetarsi are yellow with blackish tips, and 

 the four following joints are black ; on the two other pairs, the praetarsi are entirety 

 yellow like the following joint, the three last joints only being black. Wings yellowish 

 hyaline, with yellow veins, disposed as in lasiophthalma ; but the first posterior cell 

 is distinctly narrowed at the end, the 3rd and 4th longitudinal veins being slightly 

 convergent at the apex, as in parvicornis. The 2nd basal segment of the costa is 

 about straight, the 2nd costal cell being thus less widened outwardly ; small cross- 

 vein placed near the middle of the discoidal cell ; 6th longitudinal vein not reaching 

 the hind border of the wing. 



