BRITISH SPECIES OF DIPTEROUS GENUS FANNIA 157 



but rarely faint indications of a dorsal stripe ; legs coloured as 

 in the <$ , but, except in the case of the hind tibia, with only 

 the ordinary bristles ; the hind tibia carries on the antero-ventral 

 surface a row of about five equally long bristles, the usual 

 dorsal bristles, and the same antero-dorsal bristles as the £ ; 

 the wings are clearer than in the <$ . 6 to 7 mm. 



Not uncommon at Bonhill (Dumbartonshire) in July and 

 August. I have also seen it from Nethy Bridge (King). 

 pretiosa, Schin., £ . Black ; frons not projecting, epistome and 

 jowls hardly projecting; frontal stripe very narrow; antennae 

 rather long, brownish, third joint three times as long as the 

 second; arista pubescent, pale at the base; palpi brownish; 

 thorax black, shining, sides distinctly grey dusted, dorsum 

 with four indistinct stripes ; scutellum with the hind margin 

 yellowish; abdomen translucent yellow on the basal four seg- 

 ments, the first segment entirely, the second with the exception 

 of an orange triangular dorsal mark, the third except a brown 

 dorsal mark of similar nature, and the fourth except a dark 

 brown hind marginal band extended on the dorsum and the 

 sides forward, yellow, the apex, including the anal organ, black 

 brown ; legs yellow, hind femora at the tip, and hind tibia more 

 or less brown, tarsi black ; mid femora with an antero-ventral 

 row of about seven long bristles on the basal two-thirds, the 

 basal four rather widely placed and of about equal length, 

 the other three closer and shorter, from this part to the tip a 

 row of somewhat weaker, shorter, close placed bristles on the 

 contracted portion, a postero-ventral row of long and fine 

 bristles, beginning with the very long basal one, decreasing 

 towards the tip in length, and a posterior row of long hairs 

 which begins at about one-third from the base and ends in 

 longer and stronger bristles at the tip, the other bristling 

 normal ; mid tibia with the apical half distinctly thickened on 

 the ventral side, and on this side covered with pubescence, 

 which is very short and indistinct on the basal half, but longer 

 and thicker on the swollen portion, the usual bristles present ; 

 hind femora with an antero-ventral row of very short but strong 

 bristles of equal length except the tip three which are longer, 

 postero-ventral surface with a row of hair-like bristles increasing 

 in size to the tip; hind tibia with only the usual bristles; wings 

 darkened especially at the tip, third and fourth veins nearly 

 parallel, outer cross-vein nearly straight, last portion of the 

 fourth vein about two and a quarter times the penultimate; 

 calyptra unequal in size, whitish ; halteres yellow, 



