746 LIST OF DIPTERA. 



Group III. Brachelia, Desv. Essai Myod. 61. 



Group IV. Fausta, Desv. Essai Myod. 62. 



Group V. Mericia, Desv. Essai Myod. 64. 



Group VI. Erigone, Desv. Essai Myod. 65. 



Third joint of the feelers nearly linear, very slightly convex 

 above and beneath, almost truncate at the tip, much longer than the 

 second joint, but less than twice its length ; bristle naked ; first and 

 second joints very short; third joint stout at the base, whence it 

 slightly tapers along half its length, and is then slender. 



Tachina bibens ? Wied. Meig. Dip. iv. 310, 123. 

 a. England. 



Tachina Medoacus, n. s. Cinerea, capite albo micante, thoracis 

 vittis tribus nigris, antennis pedibusque nigris, palpis fulvis, alis 

 subcinereis. 



Body black, covered with gray bloom, beset with black hairs 

 and bristles : head adorned with white lustre, clothed beneath with 

 hoary hairs, a tawny stripe from the eyelets to the feelers ; sides of 

 the face fringed with bristles for one-third of the length from the 

 base ; epistoma slightly prominent : eyes dark red, not hairy : 

 sucker black, clothed at the tip with pale tawny hairs ; palpi tawny, 

 slender, beset with black bristles : feelers black, a little shorter than 

 the face ; third joint much longer than the second, flat above, 

 hardly convex beneath, truncated at the tip ; bristle much longer 

 than the third joint ; its second joint full twice the length of the 

 first ; third stout, though tapering for more than one-third of the 

 length, very slender from thence to the tip : chest adorned with 

 three indistinct black stripes : scutcheon and abdomen armed with 

 black spines : abdomen nearly elliptical, not longer than the chest : 

 legs black, clothed with black hairs and bristles ; foot-cushions 

 pitchy : wings light gray; wing-ribs tawuy ; veins pitchy, tawny at 

 the base ; tip cross-vein forming a very obtuse angle with the fourth 

 longitudinal vein, slightly curved inward near the base, straight 

 from thence to the tip, joining the border at some distance above 

 the tip of the wing ; lower cross-vein nearly straight. Length of 

 the body 3 lines ; of the wings 5^ lines. 

 a. England. 



