DIPTERA. 308 
under side slightly ferruginous : thighs with a hoary tinge: wings with a 
very slight gray tinge; veins black, tawny at the base; prebrachial yein 
forming a very obtuse angle at its flexure, from whence it is straight with 
the exception of a slight inwagd inclination near the tip; lower cross-yein 
with the two curves which are slight: alule white: halteres yellow. 
Length of the body 34 lines; of the wings 7 lines. 
Brazil. 
Tacuina cixcra, Fem. 
Nigra ; caput argenteum ; thorax albidus, nigro quadrivittatus ; abdo- 
minis segmenta albo fasciata ; ale cinerea, ad costam subfusce. 
Black: head with a silvery white covering; frontalia deep black, 
linear; facialia without bristles except at the base; epistoma not promi- 
nent: eyes bare: palpi tawny : feelers black; third joint linear, tinged 
with white, rounded at the tip, reaching the epistoma, about four times the 
length of the second; sixth pubescent, very slender, tawny towards the 
base, very much longer than the third: chest with a whitish covering which 
is interrupted by four black stripes : abdomen long-obconical, not longer 
than the chest, with a white band on the fore border of each segment : wings 
gray, brownish alony the fore border ; veins black, tawny at the base ; pre- 
brachial vein forming a very obtuse angle at its flexure, very slightly bent 
inward near the tip, which is very near that of the cubital vein and ends at 
the tip of the wing; lower cross-vein straight: alule white: halteres 
tawny. Length of the body 24 lines; of the wings 5 lines. 
Brazil. 
TACHINA NIGRIFERA. 
Nigra ; caput argenteum ; thoraw canus, nigro quadrivitiatus ; abdomen 
cano-micans ; ale cinerea, ad venas subfusce. 
Black: head with a silvery white covering ; frontalia deep black, 
slightly widening towards the feelers; facialia beset with bristles along 
the whole length: eyes hairy: palpi black, with tawny tips: feelers black ; 
third joint linear, rounded at the tip, about four times the length of the 
second, reaching the epistoma; sixth very slender, minutely pubescent, 
