1G6 [July. 



tibiae usually with about 3 anteroventral, 3-4 stronger anterodorsal, 

 and 2-3 much shorter posteroventral bristles. Hind femora with 

 3-4 anteroventral bristles towards tip, otherwise quite short-haired 

 beneath. Wings distinctly darkened, especially about base. 

 fSquumae ver^' noticeably yellowish. Halteres yellow. 



2- Much o-reyer than the male, but the bristle beneath middle 

 tibiae is equally distinctive of the species. Interfrontalia produced 

 almost to front of frons. Thorax rather olive-grey, with a distinct 

 narrow central brown stripe and faint indications of side-stripes. 

 Abdomen olive-grey, Avith a pair of brown patches ou the second 

 and third segments only, those on the third segment much smaller 

 and more rounded. Occasionally there is a very narrow central brown 

 line between the spots, which is still more often present on the fourth 

 segment. Chaetotaxy of legs as in the male, but the bristles 

 stronger. Wings not so darkened, yellowi.-h about the base. 



Length 5-7 mm. 



This species varies somewhat in the chaetotaxy of the legs; in 

 some male specimens there are no anterodorsal bristles to middle 

 tibiae, and very rarely no bristle beneath tliose tibiae; in the latter 

 case the dark yellow squamae, the absence of long posteroventral 

 hairs to hind femora, and the darkened wings help to distinguish it. 

 The species stood in the Verrall Collection under the name 

 compimcta Wied., the true compuncta being labelled with the MS. 

 name of conipnnrtoiden. 



It is apparently not uncommon in Scotland, specimens having 

 been found in the Isle of Arran and at Tongue, Rannoch, and 

 Braemar (taken by Mr. Verrall), and at Golspie and Loch Assynt (by 

 Col. Yerbury in .June and July; and at Kirkmichael (Perth) by 

 Mr. A. E. J. Carter in August. It has also occurred at Rydal 

 (Westmorland) and the Doone Valley (Devon). 



13 Q2) Middle tibiae without a bristle beneath. 



14 (33) Acrostichal bristles fine and multiserial. 



15 (24) Middle tibiae with a distinct bristle in front near or below the middle, 



All the British species under this section have long posteroventral 

 bristly hairs about the base of hind femora. 



16 (23) Halteres yellow ; arista only pubescent. 



17 (18) Large strongly bristled species. Hind femora with the anteroventral 



row of bristles continuous to base. . G. compunda Wied. 



(S . Frons rather wide, b.ing at narrowest part about 2^ times as 

 wide as third anteunal joint. Eyes practically bare. Arista micro- 

 scopically pubescent. Thurax very much as in bririi/ieisijiiajna, 

 central dark stripe in front rather broader, apparently composed of 

 three narrow confluent stripes. Scutellum with a greyish patch at 

 tip. Sternopleural bri.stles 1 : 2. Abdomen very much as in 

 bninneisquama, but less flattened dorsoventrally and with the side- 

 margins of segments when viewed from behind broadly and 

 conspicuously darkened. Legs strong!}' bristled ; front tibiae with 

 a conspicuous bristle behind ; middle tibiae with 2-3 anterodorsal 

 aud 2-3 posterior bristles, but none beneath ; hind tibiae with 2 



