349 
Append ix. 
bright testaceous with a tuft of several brown bristles ; pleurae 
ochraceous with numerous white scales. 
Abdomen covered with dusky black scales above, ochraceous 
below ; the first segment bright testaceous with a few scales 
showing violet reflections ; apex with black bristles. 
Legs deep brown more or less with metallic sheen, bases pale 
ochraceous; ventral surface of femora pallid; hind metatarsi 
shorter than the hind tibiae ; ungues small, equal and simple. 
Wings with the veins covered with rather broad dense brown 
scales ; blackish along the costa and first long vein; bases of the 
wings very pale; fork-cells long, the first sub-marginal longer 
and narrower than the second posterior, its base considerably 
nearer the base of the wing than that of the second posterior, 
stem of the latter nearly as long as the cell; stem of the first 
sub-marginal rather less than one-fourth the length of the cell; 
posterior cross-vein not quite its own length distant from the 
mid ; halteres with pale ochraceous stem and fuscous knob. 
Length .—3 • 5 mm. 
Habitat. —Para, Brazil (Dr. Durham). 
Observations .-—Described from three $’s taken by Dr. 
Durham. It is a very distinct species easily identified by the 
curious irregular thoracic scales. It comes near W. Grayii in 
the absence of abdominal ornamentation, but can at once be told 
from it not only by the thoracic scales, but also by the wing 
scales, which are much broader, more of the type of W. lunata, 
which it most nearly approaches structurally, and from which it 
may be told by the absence of abdominal lateral spots. 
Genus LIMATUS. nov. gen. 
Head covered with flat scales; proboscis of moderate length 
slightly swollen apically; clypeus nude ; palpi very small in the 
9 ; antennae with nude basal joint, 14-jointed, each joint with 
one basal row of verticillate hairs. Thorax densely clothed with 
large flat scales of two sizes, very convex at their free end ; 
prothoracic lobes densely clothed with flat scales and with a row 
of bristles ; scutellum densely clothed with flat scales, tri-lobed 
with four large and two small chaetae to the mid lobe; meta- 
notum with both chaetae and squamae; abdomen covered with 
flat scales, posterior border-bristles small ; legs rather long and 
thin, ungues small, equal and simple. Wings with rather broad, 
elongated, more or less conical scales, the free end broad and 
convex, some are slightly asymmetrical; fork-cells long, cross¬ 
veins as in Gulex, that is the supernumerary and mid meet at an 
