DIPTERA, 307 
DrxIA opscuna. 
Cinerea ; caput fulvum, argentatum ; thorax nigro quadrivittatus, scutello 
‘ulvo ; abdomen fulvum, nigro vittatum, apice albo-micans ; antenne 
y Rg » Op 
fulve ; pedes nigri, tibiis basi fulvis ; ale cineree, ad costam fusce. 
Cinereous : head tawny, with a silvery white covering, clothed behind 
and beneath with white hairs; frontalia deep black, widening from the 
eyelets to the feelers: mouth black ; palpi tawny, slender; feelers tawny ; 
third joint linear, more than twice the length of the second, not near reach- 
ing the epistoma: chest with four black stripes, inner pair slender; scut- 
cheon tawny with a cinereous covering: abdomen dark tawny, with white 
reflections at the tip, and with a black stripe which is widened on the hind 
border of each segment: legs black ; thighs tawny towards the base; an- 
terior onychia long : wings gray, brown beneath the fore border except at the 
tips ; veins black, tawny at the base; prebrachial vein forming a very 
slightly acute angle at its flexure, curved inward near this and more 
slightly so from thence to the tip; lower cross-vein with two indistinct 
curyes, the lower one inward, the upper one outward: alule dingy white 
with a tawny tinge towards the borders: halteres tawny. Length of the 
body 63 lines: of the wings 14 lines. 
Brazil. 
DexiA Fusirormis. 
Cervina ; caput album ; thorax nigro quadrivittatus ; abdomen testaceum, 
albo-micans, nigro vittatum ; antenne rufe ; pedes fulvi, tarsis ni- 
gris; ale subcineree. 
Fawn-colowr : head with a shining white covering ; frontalia ferrugi- 
nous, widening from the eyelets to the feclers ; facialia without bristles ; 
epistoma not prominent; lateralia red: eyes bare: palpi tawny : feeler; 
pale red ; third joint tapering to the tip, not nearly reaching the epistoma ; 
sixth black, feathered, slender, thick at the base, more than twice the 
length of the third : chest with four black stripes : abdomen testaceous, ob- 
conical, longer than the chest, with whitish reflections, and with a black 
stripe which is widened at the base: legs tawny ; feet black ; wings slightly 
gray ; veins black, tawny towards the base; prebrachial vein forming a 
hardly acute angle at its flexure, near which it is bent inward, and very 
