BRITISH SPECIES OF DIPTEROUS GENUS FANNIA 159 



middle stripe reddish, orbits grey dusted, narrow in front but 

 widening behind, at the broadest part about three-fourths as 

 broad as the middle stripe at that part ; arista more distinctly 

 pubescent than in the £ ; thorax grey dusted but shining ; 

 abdomen shining, grey dusted, dorsal stripe absent; legs 

 coloured as in the £ , but with only the usual bristles ; wings 

 slightly darkened and less pointed than in <$ ; calyptra and 

 halteres pale yellowish. 4I to 5 mm. 



Common at Bonhill in August and September. 



Species with only the Knee-joints or Base of Fore 

 Tibia Yellow. 



manicata, Mg., £ . Black ; eyes distinctly but not widely 

 separated by a black frontal stripe; frons, epistome, and jowls' 

 slightly projecting; third joint of antennae rather more than 

 twice as long as the second ; arista almost bare ; thorax shining 

 black, sides and dorsum behind brown-grey dusted ; abdomen 

 pale grey dusted, the dorsal stripe rather widely triangularly 

 dilated on each segment; anal organ small; legs black, with 

 the exception of the tip of the fore femora on the anterior 

 side and the basal two-thirds of the fore tibia, which are 

 yellowish ; fore tibia with a tuft of bristly hairs at the tip on the 

 postero-ventral surface ; the fore coxa has a thorn behind, near 

 the tip, which is only visible when the coxa is in a favourable 

 position ; mid coxa with a strong downward and backward- 

 directed thorn with a curved point; mid femora swollen to 

 about one-third from the tip, thickest near the end of the 

 swelling, the antero-ventral surface with a row of long bristles, 

 about ten in number, the last three or four close together on 

 the thick part of the femora, apical third bare except for a few 

 very short bristles at the tip; a somewhat similarly disposed 

 row of softer, hair-like bristles on the postero-ventral surface, 

 which forms a denser clump of bristles on the thickened 

 portion ; the other bristling normal ; mid tibia with the ventral 

 surface on the apical two-fifths swollen, raised about the middle 

 of the swelling into a tubercle, the pubescence extremely short 

 on the basal portion, but erect and long on the swollen part ; 

 the bristling as usual; hind femora with a regular row of 

 bristles on the antero-ventral surface ; hind tibia with the usual 

 dorsal bristles, a row of bristles also on each of the postero- 

 ventral, antero-dorsal, and antero-ventral surfaces ; wings greyish, 

 third and fourth veins convergent, outer cross-vein nearly 



