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DIPTERA, 2211 
the chest, widening from the base till near the tip, adorned with two yellow 
and two tawny spots, the yellow spots on the fore border of the second seg- 
ment larger than the tawny spots, which are indistinct and join the fore 
border of the third segment : legs tawny ; a black band on each hind-shank 
near the tip : wings colourless ; wing-ribs tawny ; veins black, tawny at the 
base; brands pale brown ; poisers tawny. Length of the body 2} lines; 
of the wings 4 lines. 
Brazil. 
Genus ASCIA, Megerle. 
Ascra srriava, Mas. 
Nigra, capite thoracis lateribus pectore scutellique margine postico flavis, 
abdomine vittis fulvis fasciisque flavis ornato, antennis fulvis, pedibus 
Slavis posticis fusco vittatis, alis limpidis apice fuscis. 
Head bright yellow, black about the eyelets; a small black shining 
spot above the base of the feelers: eyes pale red: mouth pale tawny: feelers 
tawny : chest black ; its sides and the breast mostly yellow ; hind border of 
the scutcheon yellow: abdomen black, clothed with black hairs; first seg- 
ment with one tawny stripe ; each following segment with three tawny stripes ; 
a short very oblique yellow band on each side of every segment : legs yellow ; 
hind-thighs, hind-shanks and hind-feet adorned with two brown stripes, and 
the like are very slightly indicated on the middle legs: wings colourless 
with brown tips ; wing-ribs tawny ; veins black, tawny at the base; brands 
black ; poisers tawny. Length of the body 2} lines ; of the wings 44 lines. 
Brazil. 
Genus BACCHA, Fabricius. 
BaccHwa optonca, Fem. 
Flava, thorace vittis tribus eneis ornato, abdomine fulvo segmentorum 
marginibus posticis apiceque piceis, antennis fulvis, pedibus flavis, 
tarsis fulvis, femoribus tibiisque posticis fusco cinctis, alis limpidis. 
Structure of B. tabida. Yellow: head black about the eyelets; a 
little black spot above the base of the feelers, which are tawny: eyes bright 
red: chest somewhat tawny about the base of the wings, adorned with three 
2G 
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