DIPTERA. 299 



longer than the third, stout for half tlie length, very slender from thence to 

 the tip : chest and abdomen with a hoary covering : chest with three black 

 stripes : abdomen oval, not longer than the chest, thickly beset with long 

 black bristles : ivings very slightly gray; veins black, tawny towards the 

 base ; priebrachial vein forming a very obtuse angle at its flexure, very 

 slightly inclined inward from thence to its tip ; lower cross-vein very 

 slightly curved inward about the middle : alula white. Length of the body 

 2^ lines ; of the wings 4 lines. 



United States. 



Tachina ancilla, Feni. 



Nigra; caput album; thorax canus ; abdominis segmenta cano fasciata ; 

 ahc sublimpidce. 



Black : head with a shining white covering ; crown with a cinereous 

 tinge ; frontalia pitchy, slightly widening at each end ; facialia beset with 

 bristles along two-thirds of the length ; epistoma yellowish, not promi- 

 nent: palpi taivny : feelers black; third joint linear, slender, truncated at 

 the tip, more than thrice the length of the second, reaching the epistoma ; 

 sixth very slender, stout towards the base, a little longer than the third : 

 chest tvith a hoary covering : abdomen obconical, not longer than the chest, 

 ivith hoary bands along the fore borders of the segments : wings almost co- 

 lourless ; veins black, tawuy towards the base ; praebrachial vein forming a 

 very obtuse angle at its flexure, hardly bent inward towards its tip, which 

 is almost united on the border to that of the cubital vein ; lower cross-vein 

 very slightly bent inward in the middle: aluloB white. Length of the body 

 If line ; of the wings 3 lines. 



United Slates. 



Tachina subvaria,* Fern. 



Nigra, albida ; thorax nigra quadrivittatus ; abdominis segmenta nigro 

 fasciata ; antenna et pedes nigra ; alee cinerecc. 



Black, with a white covering : head pale gold-colour on each side of 

 the frontalia and of the face, clothed beneath and behind with white hairs; 



* Page 266, line 20, for obconica read subvaria. 



