DIPTWRA. 313 
Dexia suscompressa, Mas. 
Nigra ; caput argenteum; thorax cinereus; nigro quadrivittatus ; ab- 
domen compressum, argenteo bifasciatum; ale cineree, apice sub- 
Susce. 
Black, slender: head with a silvery white covering, clothed beneath 
and behind with white hairs; frontalia black, narrow, widening towards 
the feelers; facialia without bristles; epistoma hardly prominent: eyes 
bare: palpi black: feelers black; second joint ferruginous at the tip: 
third linear, conical at the tip, not reaching the epistoma, more than twice 
the length of the second ; sixth feathered with rather long hairs, almost twice 
the length of the third: chest gray, with four black stripes, the outer pair 
interrupted: abdomen compressed, slightly tapering from the base to the 
tip, narrower than the chest, and full twice its length; second and third 
segments with broad silvery bands along their fore borders : wings gray, 
slightly clouded with brown near their tips; prebrachial yein forming 
an obtuse angle at its flexure, very slightly bent outward from thence to 
its tip; lower cross-vein with the two curves, the lower one deep and short, 
the upper one long and slight: alule whitish, with pale yellow borders: 
halteres pale yellow. Length of the body 44 lines; of the wings 10 
lines. 
East Indies. 
Dexia vepEstris, Mas. 
Cinerea ; caput album; thoraw nigro quadrivittatus; abdomen apice 
nigrum; antenne fulve ; pedes fulvi, validi, tarsis nigris; ale 
sublimpide. 
Black, narrow, with a cinereous covering : head with a white covering ; 
frontalia deep black, ferruginous and widening towards the feelers ; facialia 
without bristles; epistoma not prominent: eyes bare: palpi ‘tawny : 
Jeelers tawny ; third joint slender, linear, pitchy towards the tip which is 
rounded, almost reaching the epistoma, about four times the length of the 
second; sixth black, bare, slender, more than twice the length of the 
