DIPTERA. 161 
THEREVA VARIANS, Fem. 
Nigra, pectore abdomineque fulvis, hoe vittis fuscis antice wna postice 
duabus ornato, antennis pedibusque fulvis, femoribus tibiis tarsorum- 
que articulis apice nigris, alis subalbidis fusco sex-maculatis. 
Body black: head beset behind with black bristles, adorned with a co- 
vering which is tawny above, but hoary in front and beneath where it is 
clothed with very few short white hairs: eyes bright coppery red ; eyelets 
pitchy: sucker and feelers tawny ; palpi pale yellow : scutcheon armed with 
four black bristles ; breast tawny with a hoary tinge: abdomen tawny, ta- 
pering from the base to the tip, about twice the length of the chest, adorned 
above with a brown stripe, which occupies the whole of the segments along 
more than half the length from the base, and is then divided and extends in 
two slender stripes towards the tip, but is interrupted: legs tawny, clothed 
with short black hairs and bristles, the latter are chiefly on the shanks; tips 
of the thighs, of the shanks and of the joints of the feet black; fourth and 
fifth joints of the feet and claws black; foot-cushions dark tawny ; wings 
rather short, dingy white, adorned with six brown marks which cloud the 
cross-veins ; wing-ribs yellow ; veins tawny, yellow towards the base, black 
towards the tips; poisers tawny. Length of the body 3} lines; of the 
wings 5 lines. 
Van Diemen’s Land. 
THEREVA LATERALIS, Fem, 
Flavo-fusca, pectore abdomineque canis, hujus disco antennisque nigris, 
pedibus fulvis femoribus anticis tarsisque nigris, alis subcinereis bast 
et ad costam fulvis. 
Body black: head adorned with a yellowish brown covering, thickly 
* ‘clothed with black hairs above and with white hairs beneath: eyes pitchy : 
sucker and feelers black: chest tinged with yellowish brown, beset on each 
side with black bristles : breast hoary, clothed with white hairs: abdomen 
much longer than the chest, linear till near the tip where it is conical, 
adorned with a hoary covering, clothed with white hairs: disk above mostly 
black: legs tawny ; shanks armed with black bristles; feet black, tawny at 
the base ; fore-thighs black with tawny tips; foot-cushions pale tawny : 
wings slightly gray, bright tawny at the base and along the fore border ; 
