TACH1NA. 33 



prsebrachial vein forming an obtuse angle at its flexure, near which it 

 is very slightly curved inward, and is thence straight to its tip ; discal 

 transverse vein with two slight curves, parted from the hind border by 

 rather less than twice its own length, and by much less than its length 

 from the flexure of the prsebrachial. 

 Bare. (E.) 



31. roralis, L. Fn. 1846 (1761); F. ; Schr.; Gmel. ; Fal. ; 

 Desv. ; Meig. ; Mcq. ; Desv. ; Zett. grossificationis, L. ; F. ; Schr. ; 

 Gmel. ; Desv. interventum, Har. Atra, gracilis, alls nigricantibus, 

 marginibus posticis pallidioribus apice albis, alulis nigricantibus, ab- 

 domine subcylindrico. Long. 2 ; alar. 3^ lin. 



Frontalia not shining ; bristles of the front descending to half of the 

 length of the face ; facialia slightly concave, beset with bristles along 

 nearly the whole length ; epistoma not prominent ; eyes bare. Antenna 

 not near reaching the epistoma ; third joint linear, rounded at the tip, 

 a little longer than the second ; sixth minutely pubescent, full thrice 

 the length of the third. Wings blackish, pale along the hind border, 

 with a white spot on the hind part of each tip ; costal vein ending in 

 front at a little distance from the tip of the wing ; subcostal vein end- 

 ing at beyond one-third of the length ; mediastinal vein ending at be- 

 fore 'one-third of the length ; radial vein ending at about five-sixths of 

 the length ; cubital vein joining the costal at its tip ; prsebrachial vein 

 forming an obtuse and not sharply-defined angle at its flexure, and 

 another very obtuse angle near its tip, which joins the cubital far from 

 the tip of the latter ; discal transverse vein .indistinctly inclined out- 

 ward, parted from the hind border and from the flexure of the praebra- 

 chial by about thrice its length. 



Generally distributed. (E. S. I.) 



32. continua, Panzer! Fn. Ix. 19; Meig. Nigra, aureo-sub- 

 tomentosa, subtus albida, capite argenteo, alis sublimpidis, alulis flavo- 

 albis, abdomine brevi-obconico luteo cinereo-vittato. Long. 2|- ; alar. 

 5 lin. 



Head broad ; frontalia black, very narrow ; bristles of the front de- 

 scending to one-fourth of the length of the face ; face vertical ; facialia 

 without bristles ; epistoma not prominent ; eyes bare. Antennae not 

 reaching the epistoma ; second joint hardly longer than deep ; third 

 subfusiform, more than twice the length of the second ; fourth very 

 short ; fifth long ; sixth bare, stout to the tip, much longer than the 

 third. Costal vein ending at hardly in front of the tip of the wing ; 

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

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

 beyond five-sixths of the length ; cubital vein ending near the tip of 

 the costal ; praabracliial vein forming a gentle curve at its flexure, very 

 slightly curved inward from thence to its tip ; discal transverse vein 

 with two slight curves, parted by less than its length from the flexure 



VOL. II. F 



