e tawny,
not reaching the epistoma, third joint of the antennae long, linear,
arista plumose; thorax cinereous, with four black stripes, of which the
inner pair are much narrower than the outer pair; scutellum tawny
hindward; pectus white; abdomen tawny, with a few spines towards the
tip, hind borders of the third and fourth segments and tips black; legs
long, black, coxae and femora testaceous; wings grey, veins very broadly
bordered with pale brown, praebrachial vein forming a slightly obtuse
angle at its flexure, between which and its tip it is slightly curved
inward, discal transverse vein undulating, parted by about half its
length from the border, and by a little less than its length from the
flexure of the praebrachial; alulae cinereous. Length of the body 4 lines;
of the wings 9 lines.

Gen. PROSENA, _St.-Farg._

91. PROSENA ARGENTATA, n. s. _Mas et Foem._ Testacea (mas) aut nigra
(foem.), capite thoraceque argenteis, antennis fulvis, abdomine longo
fasciis vittaque nigris (mas) aut breviore fasciis cinereis lateribusque
basi testaceis (foem.), pedibus nigris femoribus testaceis, alis
subfuscescentibus (mas) aut cinereis (foem.).

_Male and Female._ Head and thorax with bright silvery tomentum,
facialia without bristles, epistoma slightly prominent; eyes bare; mouth
black, testaceous towards the base, full as long as the thorax; antennae
tawny, not reaching the epistoma, arista plumose; legs black, coxae and
femora testaceous; wings grey, veins black. _Male._ Testaceous. Pectus
mostly white; abdomen elongate-conical, with slight whitish reflexions,
dorsal stripe and hind borders of the segments black; legs long; wings
brownish towards the costa and about the veins, praebrachial vein forming
a slightly obtuse angle at its flexure, between which and its tip it is
very slightly curved inward, discal transverse vein hardly undulating,
parted by less than half its length from the border, and by less than
its length from the flexure of the praebrachial. Length of the body 5
lines; of the wings 10 lines. _Female_. Black. Pectus silvery; scutellum
deep black; abdomen conical, with broad cinereous bands, first and
second segments with broad interrupted testaceous bands, a testaceous
mark on each side of the third segment at the base; legs rather long,
femora with black tips; praebrachial vein forming a right angle at its
flexure, curved inward from thence to its tip, discal transverse vein
curved inward near its hind