DIPTERA. 85 
In these descriptions I have separated from Dasypogon the following 
six genera, which, with the exception of the first, are characterized ; Me- 
gapollyon, Cabasa, Prolepsis, Euarmostus, Pseudorus and Morimna. 
Nusa, Acurana, Scandon and Cherades, are allied to Laphria ; Phellus 
is allied to Mallophora; Cormansis to Atomosia; and Pheneus is most 
remote from the general structure of the family. 
Genus DIOCTRIA, Meigen. 
Drocrrm Tasmanica, Saunders’? MSS. 
Fem. Nigra, thoracis lateribus pectoreque ferrugineis, abdomine piceo 
lateribus ferrugineis, antennis pedibusque nigris, tibiis basi flaris, 
alis limpidis fusco vittatis et maculatis. 
Body black, shining: head clothed with black hairs and bristles, 
adorned .in front and behind with a hoary covering ; two black triangular 
spots on the face; epistoma adorned with a row of white bristles: sucker 
black, clothed with black hairs: eyes black; fore part rather flat, all the 
facets small: sucker black, clothed with black hairs; palpi black, beset 
with black bristles: feelers black, much longer than the head : chest fer- 
ruginous on each side: breast ferruginous, adorned with a hoary covering : 
abdomen pitchy, ferruginous along each side, thinly clothed with short 
hoary hairs, more thickly covered with longer hairs at the tip beneath, 
much more than twice the length of the chest, slender and linear near the 
base, spindle-shaped and a little broader from thence to the tip: legs 
black, clothed with very short black hairs, beset with a few black bristles ; 
shanks bright yellow towards the base; foot-cushions tawny: wings co- 
lourless, brown along the fore border to the tip, where this band is forked, 
it includes in the middle part of its length a colourless streak, beneath 
which there is a large irregular darker brown spot ; wing-ribs and veins 
black; poisers bright pale yellow. Length of the body 7 lines; of the 
wings 14 lines. 
Van Diemen’s Land. 
ie 
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