1921.] ]n7 



small pnteroveiitral bristles towards tip, about 6 anterodorsal bristles, 

 bepinnino- witb a short one near base and jiradually becoming lonper, 

 and 3-4 shorter finer posterodorsal bristles. Hind femora with a 

 complete row of anteroventral bristles, and with long bristl}' hairs 

 posteroventrally on basal half or more. "VS ings brownish, ef-pecially 

 about base. Squamae and halteres yellow. 



2 . Tnterfrontalia produced almost to front of frons, but narrower 

 than in brunneisquaina. Thorax somewhat variable in colour from 

 grey to yellowish-grey and in markings, but with a broad central 

 stripe bordered ripht in front by two narrow darker stripes. Sterno- 

 pleural bristles 1 : 2. Abdomen as in hrunneis(piama, but with more 

 conspicuous brownish patches at sides of segments as well as on 

 disc. Leg bristles as in the male, including those below hind femora, 

 but these latter shorter than in the male. 



Length 8-8"5 mm. 



This species is uncommon. Mr. Verrall caught a pair in the Isle 

 of Arran on June 12th, 1882, and a fennile at Aberlady (Haddington) 

 on June SOih, 1870 ; Col. Yerbury found a female at the same 

 locality on July 5th, 1899 ; and Mr. A. E. J. Carter has taken it in 

 Perthshire. 



18 (17) Hind femora with anteroventral bristles only on apical half. 



19 (20) Larger species with wider frons and deeper jowls, the latter quite one- 



third the vertical diameter of eye and blackish in most lights 



.... *7. inimlavis, sp. n. 



cf. Somewhat resembling com/wnc^n, but rather smaller. Frons 

 as in that species rather wide. Arista slightl}' more pubescent. 

 Jowls deeper and blacker. Thorax darker, but sharply greyish about 

 humeri and notopleural depression. Scutellum all dark. Tlie lower 

 posterior sternopleural bristle not strong. Abdomen rather narrower, 

 with wider and usually less separated dark patches on 2ud aud 3rd 

 segments, and with a pair of small patches on 4th segment. Front 

 tibiae sometimes with a bristle behind ; middle tibiae with 1-2 

 anterodorsal aud 2 posterodorsal bristles ; hind tibiae with 3-4 fairly 

 strong anteroventral bristles, 1-2 anterodorsal on middle third, and 

 usually only 1 small posterodorsal bristle. Middle femora with finer 

 posteroventral bristles ; hind femora with anteroventral bristles on 

 apical half ouh', and a row of much shorter (but longer than in 

 brunneisquama) posteroventral bristly hairs on basal half. Wings 

 ra.ther yellowish-brown. Squamae pale yellowish. Halteres yellow. 



$ . Interfrontalia not quite extended to front of frons and not so 

 narrow as in compuncta, slightly trlistening in some lights. Jowls 

 greyer than in male. Thorax uniformly brownish on disc, the colour, 

 however, may break up into stripes towards scutellum. Scuteilum 

 greyish on disc. Abdomen as in compwicta, but no brownish patches 

 at sides unless indistinctly on fourth segment. Chaetotaxy of legs 

 as in the male, but hind femora posteroventrally with only 4-0 short 

 fine bristly hairs near the base. 



Length 5-5-7 mm. 



This species occurred fairly Ireely to Mr. Verrall in the Isle of 



