DIPTERA. 207 
Genus PSILOPUS, Megerle. 
PsiLopus Lepmus, Mas. 
Viridis, abdominis segmentorum marginibus anticis nigris, antennis pe~ 
dibusque nigris, alis limpidis fusco bifasciatis. 
Bright green, beset with black bristles: head blue, tinged with purple, 
adorned in front with white bloom: eyes bright red: mouth black: feelers 
black; sixth joint as long as the chest : chest not shining, tinged with blue : 
breast with a hoary covering: abdomen tapering from the base to the tip, 
narrower and much longer than the chest; a black band on the fore border 
of each segment: legs black, clothed with black hairs and bristles : wings 
colourless, adorned with two dark brown bands which are united on the fore 
border ; tip cross-vein forming a right angle, whence it is indistinctly waving 
to the tip of the wing ; lower cross-vein very slightly waving : wing-ribs 
and veins black. Length of the body 23 lines; of the wings 6 lines. 
Mexico. 
Psinopus Erectus, Mas et Fem. 
Purpureus, pectore abdominisque fasciis viridibus, antennis pedibusque 
nigris, tibiis fulvis, alis sublimpidis costa fasciisque duabus connexis 
Suseis. 
Purple, beset with black bristles: head blue, tinged with purple on the 
crown, green in front, with a white bloom about the mouth: eyes red: 
mouth black: feelers black, siwth joint shorter than the chest : chest partly 
blue : breast green : abdomen longer and narrower than the chest, of the 
male cylindrical with alternate purple and green bands, of the female obco- 
nical: legs black ; thighs thinly clothed with white hairs; shanks tawny : 
wings nearly colourless, dark brown along the fore border for near half the 
length from the tip; from this stripe two broad irregular bands proceed near 
to the hind border, are there connected, and thus include a square colourless 
spot; tip cross-vein forming a slightly acute angle ; lower cross-vein very 
slightly waving ; wing-ribs and veins black ; poisers yellow. Length of the 
body 14 line ; of the wings 4 lines. 
Brazil. 
at 
