7 
eee eT ; 1 = 
DIPTERA, ; : sll 
the base ; veins black, ferruginous at the base; prebrachial vein forming 
a slightly obtuse angle at its flexure which emits a short branch, a little 
curved inward near this, almost straight from thence to the tip; lower cross- 
vein with two slight curves, the lower inward, the upper one outward: 
alule dingy white. Length of the body 5} lines; of the wings 11 lines. 
Georgia. 
DEXIA BASALIS. 
Cana; caput auratum; antenne lutea; thorax nigro quadrivittatus, 
scutello piceo, pectore ferrugineo ; abdomen cyaneum, basi ferrugi- 
neum; pedes fulvi, tarsis nigris; ale cinerea, venis fusco margi- 
natis. 
Hoary : head gold-colour, clothed beneath with yellow hairs ; frontalia 
triangular, yellowish brown, widening much from the eyelets to the feelers ; 
face very pale yellow ; epistoma prominent; facialia having on each side a 
pitchy spot, between which and the epistoma they are beset with bristles: 
eyes bare; all the facets small: mouth and palpi ferruginous: feelers lu- 
teous ; third joint more than twice the length of the second; sixth black: 
chest with four interrupted black stripes ; scutcheon pitchy: breast ferrugi- 
nous with a hoary tinge: abdomen blue, ferruginous with a hoary tinge 
towards the base : legs tawny ; feet black: wings gray, darker at the base, 
tinged with brown about the veins which are black; prebrachial vein hardly 
curved inward beyond its flexure ; lower cross-vein with two curves, the 
lower inward curve more distinct than the upper outward curve: alule 
pale dingy testaceous. Length of the body 4} lines; of the wings 11 lines. 
South America. 
DEXIA LONGA. 
Nigra; caput argenteo-ferrugineum ; thorax cinereus, nigro quadrivitta- 
tus; abdomen fusiforme, thorace plus duplo longius, lateribus piceum, 
cinereo octomaculatum ; ale cineree, ad venas fusce. 
Black: head ferruginous with a silvery white covering, clothed behind 
and beneath with dingy white hairs; frontalia triangular, widening much 
Tl 
