86 MUSCID^E. 



third of the length ; mediastiual vein ending at a little beyond half of the 

 length ; radial vein ending at a little before five-sixths of the length ; 

 cubital vein joining the costal near its tip ; prsebrachial vein forming 

 an obtuse angle, between which and its tip it is very slightly curved 

 inward ; discal transverse vein with two very slight curves, parted from 

 the border by nearly its length, and by much less than its length from 

 the flexure of the prsebrachial. 

 Not rare. (E.) 



152. inoperta, n. Nigra, cano-tomentosa, capite albo, palpisful- 

 vis, antennarum articulo sexto ad dimidium incrassato, tJiorace nigro- 

 quadrivittato, alis cinereis, alulis subcinereis, abdomine obconico, vitta 

 dorsali et segmentorum marginibus posticis nigris. Long. 4 ; alar. 8 

 lin. 



Frontalia deep black, slightly widening in front ; bristles of the front 

 descending very little below the base of the antenna ; face vertical ; 

 epistoma not prominent ; palpi tawny. Antennae nearly reaching the 

 epistoma; third joint linear, slightly truncated at the tip, full four 

 times the length of the second ; fourth obsolete ; fifth distinct ; sixth 

 bare, very much longer than the third, thick to half its length ; thorax 

 with four black stripes. Costal vein ending at a short distance in front 

 of the tip of the wing; subcostal vein ending at very little beyond 

 one-third of the length ; rnediastinal vein ending at a little beyond half 

 the length ; radial vein ending at about five-sixths of the length ; cu- 

 bital vein joining the costal near its tip ; prsebrachial vein forming a 

 very obtuse and not sharply defined angle at its flexure, nearly straight 

 from thence to its tip ; discal transverse vein with the hinder curve 

 more distinct than the fore one, parted from the border and from the 

 flexure of the prsebrachial by a little less than its length. 



Bare. (E.) 



153. audax, Mcq. A. S. E. P. ser. 2. vii. 388. 48 (1849). Nigra, 

 cano-tomentosa, capite albo, palpis nigris, antennarum articulo sexto ad 

 dimidium incrassato, thorace nigro-quadrivittato, scutelli marginibus rufis, 

 alis subcinereis, alulis albis, abdomine obconico subtessellato. Long. 

 4 ; alar. 8 lin. 



Frontalia ferruginous along each side ; bristles of the front descend- 

 ing to nearly half the length of the face ; epistoma pale testaceous, not 

 prominent ; palpi black. Antennas reaching the epistoma ; third joint 

 slightly decreasing in breadth beyond the base, almost truncated at the 

 tip, about six times the length of the second; sixth stout for half the 

 length, very much longer than the third ; thorax with four black stripes. 

 Oostal vein ending at some little distance from the tip of the wing ; 

 subcostal vein ending at much beyond one-third of the length ; medi- 

 astinal vein ending at much beyond half the length ; radial vein ending 

 at about five-sixths of the length ; cubital vein joining the costal near 

 its tip ; prsebrachial vein forming a slightly obtuse angle at its flexure, 



