DIPTERA. 3 
Dimassus TERMINALIS, Plate I. fig. 6. 
Mas. Niger, lateribus scutelli margine abdominisque apice ferrugineis, 
abdominis segmentorum marginibus posticis albis, antennis pedibus- 
que ferrugineis, tarsis nigris, alis subcinereis fusco bifasciatis. 
Body black: head adorned with white lustre, beset behind with black 
bristles, clothed beneath with hoary hairs; eyes pitchy, fore part flat, its 
facets hardly larger than those elsewhere: sucker black; palpi tawny, 
clothed with black hairs; feelers ferruginous ; first and second joints beset 
with black bristles: chest adorned with two gray stipes, its sides and the 
hind border of the seutcheon ferruginous: abdomen dull black, adorned 
with gray lustre, slightly decreasing in breadth from the base to the tip, 
clothed on each side with white hairs, about twice the length of the chest ; 
sides and tip ferruginous, the latter clothed with black hairs ; hind borders 
of the segments white: legs ferruginous ; hips black, tinged with gray ; 
shanks beset with a few black bristles ; feet black; four hinder feet yellow 
at the base; foot-cushions tawny: wings gray, slightly tinged towards the 
hind border with pale brown, adorned with two broad dark brown bands, 
the second extending near to the tip; wing-ribs tawny ; veins black, tawny 
at the base and along part of the fore border; tip cross-yein very slightly 
curved upward till near the tip, where it has a short and equally slight 
downward curve ; poisers tawny, their knobs dingy yellow, black towards 
the base. Length of the body 5—54 lines; of the wings 8—9 lines. 
New South Wales. 
Dimassus pivisus, Mas. 
Niger, abdomine basi fulvo, antennis nigris, pedibus fulvis, tibiis piceis 
basi fulvis, tarsis nigris basi albis, alis limpidis cinereo trifasciatis 
ad costam subfulvis. 
Body black, shining: sucker, palpi and feelers black: feelers a little 
longer than the head; first and second joints beset with short black bris- 
tles: eyes red; all the facets very small: abdomen cylindrical, nearly 
twice the length of the chest; first, second and third segments bright 
tawny: legs tawny; shanks beset with a few short black bristles, pitchy 
for two-thirds of the length from the tips; feet black ; first joint white, with 
the exception of the base, which is pitchy; foot-cushions tawny: wings 
colourless, with a slight tawny tinge along the fore border, adorned with 
three broad dark gray bands; the third extends nearly to the tip, and is 
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