DIPTERA. 249 
near the hind border of the second segment ; disks of the third and fourth 
segments black: legs clothed with short tawny hairs; fore-thighs and 
middle-thighs black with tawny tips; hind-thighs thick, tawny with black 
tips ; fore-shanks tawny with black tips ; middle-shanks tawny ; hind-shanks 
black, curved, with a tawny band ; fore-feet and hind-feet pitchy; middle- 
feet tawny with black tips; claws tawny with black tips: foot-cushions 
tawny: wings colourless ; wing-ribs and veins tawny; veins black towards 
the tips; poisers tawny. Length of the body 4 lines; of the wings 74 
lines, 
East Indies. 
ErisTaLis sEmMicrrcuLus, Mas. 
Niger, abdominis maculis quatuor et segmentorum marginibus posticis 
fulvis, antennis piceis, pedibus nigris, tibiis tarsisque anterioribus basi 
fulvis, femoribus posticis crassis, alis limpidis. 
Black: head adorned with a hoary covering: eyes bronzed: feelers 
pitchy: chest adorned with two pale tawny bands, the first straight, the other 
concave: breast with a hoary tinge: abdomen obconical, a little shorter 
than the chest, adorned with four tawny spots, of which the first pair are 
much larger than the second pair; hind borders of the segments tawny : 
shanks and feet towards the base and knees tawny ; hind-legs black with thick 
thighs, ferruginous knees and curved shanks : wings colourless ; wing-ribs 
tawny ; veins black, tawny at the base; poisers tawny. Length of the body 
3 lines ; of the wings 6 lines. 
Honduras. 
Eristatis corrosus, Mas. 
Niger, capite fulvo supra nigro, thorace cyaneo trivittato, abdominis vitta 
lata ventreque fulvis, apice cyaneo, circulo ante apicali viridi-eneo, 
antennis ferrugineis, pedibus fulvis, femoribus posticis apice nigris, 
ibis posticis piceis fulvo cinctis, alis sublimpidis. 
Head black, bright tawny and clothed with tawny hairs in front: eyes 
bright red ; facets above larger than those elsewhere : feelers ferruginous; 
sixth joint black : chest bright blue, adorned with three velvety black bands, 
middle one broad and straight; side pair interrupted, nearly spindle- 
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