12. 
13. 
14. 
15. 
16. 
Grey or cinereous species, usually with conspicuous stripes on 
the thorax 
Anal segment rufous or ochraceous, in coloration contrasting 
with the preceding segments os . oe 
Anal segment of the same coloration as the preceding segments 
. Cheeks with a deep transverse groove extending from the 
facial ridges to the lower limit of the eyes; eyes not 
BRACHYCOMA. 
descending beneath the vibrissz 
Cheeks without such a groove; eyes descending beneath the 
vibrissz 
Antenne rufous 
Antenne black 
. Scutellum testaceous 
Scutellum cinereous . 
Abdomen cinereous, with irregular black reflecting spots ; 
smaller species (5°5 millim.) 
. Antenne, or at least their basal joints, rufous 
Antenne wholly black 
. Abdomen light grey, with black “reflecting spots, which are 
arranged in three rows ; larger species (8°5 millim. or more) 
. Frontal bristles on each side in a double row . 
Frontal bristles on each side in a single row . 
. Legs partly rufous ; abdomen yellowish-rufous 
Legs wholly black ; abdomen cinereous or testaceous . 
. Posterior cross-vein nearly in the middle between the small 
cross-vein and the curvation of the fourth vein . 
Posterior cross-vein distinctly beyond the middle between the 
small cross-vein and the curvation of the fourth vein 
Hind tibie outwardly fringed with bristles of equal length, 
which are placed close to each other . 
Hind tibiz outwardly with bristles of unequal length, ‘and if 
somewhat fringe-like with a longer bristle at or beneath 
the middle 
Frontal bristles on each side | in a double row or somewhat 
irregular 
Froutal bristles on each side in a single row . 
Palpi rufous; larger species (10 millim.) . 
Palpi black ; smaller species (6 millim.) 
Frontal band as broad as the lateral portions. 
Frontal band narrower than the lateral portions . 
Bristles above the vibrissee mounting to nearly half the face ; 
palpi rufous . 
Bristles above the vibrisse few i in number and not mounting 
on the face; palpi black . 
Fo Biot 
foveata, v.d. Wulp. 
5. 
robusta, v. d. Wulp. 
6. 
ruficauda, v. d. Wulp. 
7. 
trifida, v. d. Wulp. 
pygmea, v. d. Wulp. 
9. 
12. 
biseriata, v. d. Wulp. 
10. 
pallidula, v. d. Wulp. 
11. 
sublucens, v. d. Wulp. 
91 
subtilipalpis, v. d. Wulp. 
fimbriata, v. d. Wulp. 
13. 
14. 
15. 
trregularis, v. d. Wulp. 
nigripalpis, v.d. Wulp. 
16. 
17. 
barbatula, v. d. Wulp. 
incompta, v. d. Wulp. 
n 2 
