178 THE SCOTTISH NATURALIST 



the middle stripe than to the eye margin ; thorax and abdomen 

 thickly grey dusted, somewhat shining ; legs black, fore knees 

 yellowish ; ventral bristle on mid femora large ; mid tibia with 

 three antero-dorsal and two postero-dorsal bristles; hind tibia 

 with besides the usual bristles three or four additional antero- 

 ventral bristles. 4 to 5 mm. 



Very common at Bonhill. I have also seen this from 

 Polton (Carter) ; Oxford (Hamra) ; May to August. 



12. a'erea, Ztt., 6* • L)ull black ; eyes very large, frons not projecting, 

 jowls descending very narrowly below the eyes; antennae 

 moderately long, arista bare ; thorax dull black, slightly shining 

 when viewed from behind ; abdomen dull black, with traces of 

 dusting on the fore margins of the segments, especially the 

 fourth ; anal organ rather large ; legs black, fore and mid knees 

 only inconspicuously brownish yellow ; mid femora constricted 

 at the tip ; antero-ventral surface with a row of about fifteen 

 bristles, the first six being long, strong, and widely placed, the 

 remainder being shorter and closely situated, the row ends at 

 the narrowed part of the femora and that part is bare except 

 for three very short bristles at the tip; postero-ventral row 

 begins at the base with the ventral long bristle, is somewhat 

 more regular in length and more numerous, but more hair-like ; 

 mid tibia thin at the base, very slightly swollen before the 

 middle, then thinner, and the tip half distinctly thickened, the 

 pubescence on the ventral surface distinct and erect only on 

 the tip half; bristling normal; mid metatarsi with a thorn at 

 the base as in armata, but rather weaker ; hind femora with a 

 row of hairs, more bristle-like at the end, on the basal three- 

 fourths of the postero-ventral surface; antero-ventral surface 

 bare ; hind tibia with only the usual bristles ; wings darkened, 

 outer cross-vein almost straight, last portion of fourth vein about 

 three times the penultimate; calyptra black, equal in size; 

 halteres black. 



9 . Dull black, thickly brown-grey dusted ; frons rather more 

 than one-third the breadth of the head, middle stripe broad, 

 viewed from in front pale grey dusted and rather conspicuous ; 

 antennae broader than in the £ ; thorax slightly shining ; 

 abdomen nearly entirely dull; legs black-grey, fore knees in- 

 distinctly yellow; ventral bristle on mid femora long; hind 

 tibia with the usual bristles ; wings clear ; calyptra and halteres 

 yellow. 3 to 4 mm. 



A very common species at Bonhill. The pale grey frontal 



