202 THE SCOTTISH NATURALIST 



black ; mid femora hardly contracted at the tip, with an antero- 

 ventral row of about eight strong bristles on the basal two- 

 thirds, and a row of very short but strong bristles on the 

 apical third, postero-ventral surface with a somewhat similar 

 row of rather weaker bristles ; posterior surface with a row of 

 long, soft, curved hairs, a few strong bristles at the tip of the 

 postero-dorsal surface and a few weaker bristles at the tip of 

 the antero-dorsal surface ; mid tibia with the apical half slightly 

 thickened, ventral surface clothed with rather short but distinct 

 pubescence which lengthens as it nears the apex j two antero- 

 dorsal and two postero-dorsal bristles present, the upper much 

 the weaker; bristling of hind femora not remarkable; hind 

 tibia with generally two bristles on the antero-ventral surface, 

 and about three above the usual one present on the antero- 

 dorsal surface; calyptra black, under scale much protruding; 

 halteres yellow ; wings infuscated, outer cross-vein waved, last 

 portion of fourth vein rather more than twice the penultimate ; 

 third and fourth veins slightly convergent. 

 ? . Unknown. 4 to 5 mm. 



Only the £ of this has been taken so far, and the four 

 specimens I have were taken at Bonhill and Cardross ; June 

 to August. 



19. carbo?iaria i Mg. ( = ccrvina, Verr.), £ . Shining blue-black; 

 frons in profile showing in a continuous silvered line which is 

 unbroken on the sides of the face, epistome and jowls pro- 

 jecting somewhat ; third joint of antennae about twice the 

 length of the second, arista bare; thorax blue-black, slightly 

 dusted; abdomen blue-black, pale grey dusted, the dorsal line 

 distinctly triangularly dilated, anal organ small ; legs blue-black ; 

 mid femora not much constricted at tip ; antero-ventral surface 

 with about eighteen bristles on the basal three-fourths, the row 

 decreasing in size as it advances until the last nine or ten form 

 a comb-like row on the beginning of the apical third, three or 

 four weak bristles near the tip ; postero-ventral row longer but 

 weaker; mid tibia gradually thickened towards the tip, 

 pubescence very short at the base, but longer, thicker, and 

 somewhat irregular on the thicker portion, generally three 

 antero-dorsal and two postero-dorsal bristles present; hind 

 femora with four or five long bristles at the tip on the antero- 

 ventral surface ; hind tibia with two dorsal, two antero-dorsal, 

 and two or three antero-ventral bristles ; wings grey, yellow at 

 the base, fourth and fifth veins almost parallel, outer cross-vein 



