BRITISH SPECIES OF DIPTEROUS GENUS FANNIA 203 



almost straight, last portion of fourth vein two and a quarter 

 times the penultimate; calyptra whitish; halteres yellow. 

 9 . Shining blue-black ; recognisable at once by the brilliantly 

 shining black orbits, which are twice as wide as the matt-brown 

 middle stripe ; mid tibia with one antero-ventral and one postero- 

 ventral bristle; in other respects much as in the &. The 

 yellowish wings and shining blue colour gives the $ much the 

 appearance of a Lonchcea. 



I have taken two $ $ and two ? 9 at Bonhill, and 

 one ? at Cardross ; June to July. 



20. polychceta, Stn., $ . Black, shining ; eyes very large and close 

 together, unprojecting in profile, jowls descending a little below 

 the eyes ; antennae rather short ; arista nearly bare ; thorax 

 black with a greenish tinge, very slightly dusted; abdomen 

 coloured as the thorax, distinctly pale grey dusted, rather hairy, 

 dorsal line distinct, anal organ small ; legs black, the fore 

 knees distinctly, the others indistinctly yellowish ; mid femora 

 with a row of eight or nine long bristles on the basal two- 

 thirds, decreasing in size towards the end, a row of ten to 

 eleven equally long little comb-like bristles on the base of the 

 slightly constricted apical third, then a small bare portion and 

 four to five very short bristles at the tip on the antero-ventral 

 surface; bristles on the postero-ventral surface longer and 

 rather weaker than on the antero-ventral ; ventral bristle con- 

 spicuous ; mid tibia with very little apical thickening, pubescence 

 short at the base, but becoming long towards the apex, at its 

 longest part about equal to the breadth of the tibia, antero- 

 dorsal surface with three bristles, the upper near the middle the 

 weakest, the middle one very long and strong, postero-dorsal 

 also with, generally, three somewhat similarly placed bristles ; 

 hind femora with a row of rather short bristles from base to tip 

 on the antero-ventral surface, the last two longer than the 

 others, and a row of weaker bristles on the basal two-thirds of 

 the postero-ventral surface of almost equal length; hind tibia 

 with two dorsal, three antero-dorsal (the middle one the longest), 

 and two or three antero-ventral bristles ; wings darkened, third 

 and fourth veins slightly convergent, outer cross-vein nearly 

 straight, last portion of fourth vein two and a half times the 

 penultimate ; calyptra unequal, whitish ; halteres yellowish. 

 9 . Frons hardly one-third the breadth of the head, parallel- 

 sided, thickly grey dusted ; middle stripe from in front by its 

 dusting hardly distinguishable from the orbits; orbits dull, at 



