52 
Yellowish-cinereous ; front not prominent, very narrow behind; thorax with five black stripes ; 
Head whitish with cinereous reflections ; 
10. 
ll. 
. Antenne black with the basal joints rufous ; 
. Front very prominent ; 
DIPTERA. 
. Abdomen unicolorous black . 
Abdomen otherwise coloured, if black having some whitish 
reflections . 
. Second and third abdominal segments without macrochetz or 
only with marginal ones . . . 
Second and third abdominal segments, at “least the third, with 
discal and marginal macrochetee 
. Ground-colour of the abdomen violaceous, with a tendency to 
metallic blue or green, and with rather sharply limited black 
hind borders of the segments . ........ 
Ground-colour of the abdomen grey or testaceous with blackish 
reflecting spots, or black with whitish reflections . 
thoracic stripes 
rather broad woe ee 
Antenne wholly black ; thoracic stripes linear 
. Anal segment of the same grey coloration as the preceding 
segments se ee 
Anal segment rufous or ochraceous. . - oe ew th 
eyes not descending beneath the 
vibrissz toe oe . . . 
Front slightly prominent ; eyes descending beneath the vibrissze 
Scutellum testaceous; bristles of the hind tibie fringe-like 
Scutellum greyish, only slightly rufous at the hind margin; 
bristles of the hind tibiz not fringe-like . . 
black hind-borders of the abdominal segments 
sharply limited 
Ochraceous ; 
Grey or cinereous, the abdomen with blackish reflecting spots ; 
or black, the abdomen with whitish reflections . 
Anal segment rufous oe eee oe 
Anal segment of the same coloration as the preceding segments 
Small cross-vein on the middle of the discal cell . 
Small cross-vein distinctly before the middle of the discal cell . 
1. Mystacella rubriventris, sp. n., ¢. 
lugubris, v. d. Wulp. 
3. 
4. 
6. 
violacea, v. d. Wulp. 
lineata, v. d. Wulp. 
solita, v. d. Wulp. 
adjuncta, v. d. Wulp. 
tessellata, v. d. Wulp. 
postera, v. d. Wulp. 
fuscicostalis, v. d. Wulp. 
10. 
flavifrons, v. d. Wulp. 
ll. 
subcyanea, v. d. Wulp. 
setulosa, v. d. Wulp. 
scutellum and 
abdomen testaceous, the abdomen with yellowish and dark reflecting spots and a black dorsal band; no 
dorsal macrochete ; third antennal joint and legs black ; wings hyaline. 
Length 10 millim. 
front very narrow, on the vertex less broad than half the diameter 
of the eyes; frontal band black ; frontal bristles rather weak and short, increasing in length towards the 
antenne and descending to the end of the second antennal joint ; the bristles on the vertex more robust. 
Kyes densely but shortly pilose, descending to beneath the vibrisse ; oral margin laterally densely beset 
with short hairs, the hairs ascending along the facial ridges up one third of the face, and out of which the 
two vibrisse arise at a considerable distance above the oral margin. 
Antenne notably shorter than the 
face ; the basal joints dark rufous; third joint black, nearly twice as long as the second ; arista thickened 
scarcely to the middle. 
Proboscis black ; palpi pale rufous, filiform. Thorax yellowish-cinereous, with five 
