TACH1NA. 53 



third. Veins testaceous. Costal vein ending at some distance in front 

 of the tip of the wing ; subcostal vein ending at beyond one-third of 

 the length ; mediastinal vein ending at hardly beyond half of the length ; 

 radial vein ending at a little before four-fifths of the length ; cubital 

 vein ending near the tip of the costal; prsebrachial vein forming a 

 hardly obtuse angle at the flexure, much curved inward near this, almost 

 straight from thence to the tip ; discal transverse vein with two very 

 indistinct curves, parted by much less than its length from the border, 

 and by little more than half its length from the flexure of the prae- 

 brachial. 



Not common. (E. S.) 



77. immissa, n. Nigra, cano-tomentosa, capite albo, facie parum 

 obliqua, antennarum articulo sexto quarto, apicali excepta incrassato, tho- 

 race nigro-quadrivittato, alis cinereis, alulis albis, abdomine ovato, seg- 

 mentorum marginibus posticis vittaque dorsali nigris. Long. 3 ; alar. 

 81in. 



Frontalia deep black, linear ; bristles of the front descending to half 

 the length of the face ; face slightly oblique ; epistoma not prominent. 

 Antennas reaching the epistoma ; second joint very much longer than 

 deep ; third linear, slightly truncated, more than twice the length of 

 the second ; fourth very short ; fifth short ; sixth bare, stout to three- 

 fourths of the length, very much longer than the third. Costal vein 

 ending at far in front of the tip of the wing ; subcostal vein ending at 

 much beyond one-third of the border ; mediastinal vein ending at much 

 beyond half of the border ; radial vein ending at five-sixths of the 

 border ; cubital vein ending very near the tip of the costal ; proebracliial 

 vein forming an obtuse angle at the flexure, hardly curved inward from 

 thence to the tip ; discal transverse vein with two very indistinct curves, 

 parted by less than its length from the flexure of the prsebrachial, and 

 by much more than its length from the border. 



Rare. In Mr. Desvignes's collection. (E.) 



78. involuta, n. Nigra, cano-tomentosa, capite albo, facie parum 

 obliqua, antennarum articulo sexto ad Us trientem incrassato, thorace 

 nigro-quadrivittato, alis cinereis, alulis albis, abdomine longi-ovato 

 subtessellato. Long. 4 ; alar. 7 lin. 



Frontalia deep black ; face slightly oblique ; bristles of the front de- 

 scending beyond one-third of the face ; epistoma not prominent. An- 

 tennas reaching the epistoma ; third joint linear, rounded at the tip, 

 about thrice the length of the second ; fifth rather long ; sixth a little 

 longer than the third, thick for two-thirds of the length. Costal vein 

 ending at some distance above from the tip of the wing ; subcostal vein 

 ending at a little beyond one-third of the length ; mediastinal vein end- 

 ing, at a little beyond half of the length ; radial vein ending at much 

 beyond three-fourths of the length ; cubital vein ending near the tip 

 of the costal ; prasbrachial vein forming a very obtuse angle at its flex- 



