BRITISH SPECIES OF DIPTEROUS GENUS FANN1A 205 



only one antero-dorsal bristle, hind tibia with the preapical 

 bristle present. Stein gives the bristling as the foregoing, but 

 I have a series, mentioned under kowarzii, in which I find the 

 bristling varies considerably. The mid tibia has sometimes 

 two antero-dorsal bristles, and the hind tibia has often two 

 antero-dorsal and one to two antero-ventral bristles. I have 

 never taken this species in cop., so cannot say definitely whether 

 I am correct in calling this female sociella, but the abundance 

 of these variations leads me to infer that this is so. 5 to 5 J mm. 

 Abundant in woods at Bonhill ; May to July ; Blairgowrie 

 (Carter). 



22. glaucescens, Ztt., £. Shining black with a greenish tone; 

 frons somewhat, jowls but little, projecting; eyes distinctly 

 separated by a black stripe ; orbits silvered, narrower than the 

 middle stripe ; antennae shorter than the face, third joint twice 

 as long as the second; arista bare; thorax shining black, 

 dusted distinctly behind, a faint indication of two dorsal 

 stripes on the front ; abdomen shining, dark olive-green, dusted 

 on the fore margins of the segments, dorsal line present, 

 almost naked, last segment with a row of long bristles on -the 

 hind margin, anal organ very large and strong; legs black, 

 indistinctly paler at the knees ; mid femora with a continuous 

 row of bristles from base to tip on the antero-ventral surface, 

 which increase in size to the middle and decrease in size but 

 become closer to the tip; ventral bristle distinct; postero- 

 ventral bristles weaker, but more numerous, and at the con- 

 stricted portion of the femora a break in the row, a weak 

 bristle near the tip; mid tibia slightly thickened, the 

 pubescence very short and thick, hardly increasing in length 

 towards the tip, the usual bristles present; hind femora with 

 an antero-ventral row of short bristles, increasing in size at the 

 tip, postero-ventral surface with a few bristles on the basal 

 two-third ; hind tibia with the usual bristles ; wings yellowish, 

 veins brown, third and fourth veins slightly convergent, the 

 outer cross-vein bent, last portion of fourth vein two and three- 

 quarters the penultimate ; calyptra yellowish, unequal ; halteres 

 yellow. 

 9 . Dark brassy-green, shining ; frons more projecting than 

 with the $ , narrowed behind ; orbits grey dusted ; from base 

 of antennas to ocelli of equal breadth, about three-quarters as 

 broad as the middle stripe at its narrowest part ; thorax grey 

 dusted, more so at the sides ; abdomen shining brassy-green ; 



