DIPTERA. 101 
first and second joints beset with a few black bristles ; second much shorter 
than the first; third linear, slightly curved, full twice the length of the 
first and second joints: chest red ; its fore part adorned with a short black 
stripe : abdomen linear, blackish-purple, a little narrower than the chest, 
and less than twice its length, clothed with hoary hairs, which abound 
most at the tip: legs black, shining, rather long, beset with black bristles ; ; 
foot-cushions pitchy: wings blackish-brown, somewhat paler along the 
hind borders and in the disks of the areolets; wing-ribs and veins black; 
poisers tawny. Length of the body 4 lines; of the wings 10 lines. 
Van Diemen’s Land. 
PROLEPSIS, n. g. 
Alis areole postice tres; vena inter areolas 2am et 3am angulum 
rectum fingens ven proxime basi juncta; areola la inferior margine 
posteriore clausa. 
Face armed with a thin tuft of bristles: fore-shanks without tip-spines : 
middle submarginal areolet rather wide on the border, the fork of the vein 
which includes it much nearer to the little cross-vein in the disk than to 
the tip of the wing ; three postevior areolets ; the vein between the second 
and the third, not as usual, passing direct to the hind border, but forming 
aright angle, and joining the next vein towards the base ; first inferior 
areolet closed on the hind border. 
PRroLErsis FUMIFLAMMA, Plate 3, fig. 6. 
Fem. Nigra, humeris fulvo vittatis, abdomine nigro-cyaneo, antennis basi 
fulvis, pedibus nigris, alis fulvis, margine postico nigris, apice albis 
nigro fasciatis. 
Body black: covering of the head brown; hind part and sides of 
the crown beset with black bristles: face shining, armed with a thin 
tuft of black bristles: eyes black; fore part flat, its facets larger than 
those elsewhere: sucker black, clothed with black hairs: first and se- 
cond joints of the feelers tawny, beset with black bristles: a short, 
oblique, pale tawny stripe on each side of the front of the chest: abdomen 
blue-black, almost linear, conical towards the tip, clothed with short, black 
hairs, as broad as the chest and towards twice its length: legs black, 
clothed with short black hairs and bristles: wings dark tawny, blackish 
long the hind border and with a broad blackish band near the tip, which 
Pp 
