1906.J ^^^ 



two ratlier fine hairs in atklilion to tl.e two strong bristles ; front row 

 of frontal bristles nearly straight, middle row concave in front ; pro- 

 boscis extremely large and prominent, especially in female ; palpi 

 bare but for two or three strong bristles at the tip ; ( J ) some strong 

 bristles on hind margin of 6lh abdominal segment, hypop.ygium 

 chestnut coloured, large and con^^lex, anal protuberance nioderately 

 long, (?) end of the abdomen shaggy with numerous longish hairs; 

 legs" blackish-brown, tibiae and tarsi yellow. Frequents carrion and 



rotting fungi ; autumn. • d i 



^ ^ 2^—3 mm.— trinervis, Beck. 



5 (i) (3) Palpi broad and leaf -like (normal). 



6 (11) Scutellum with two bristles only. 



7 (10) Legs very long and slender ; palpi dmky. 



8 (9) Halteres ivhite or yellow. 



i $ . Thorax and abdomen black; middle row of frontal bristles 



straight, arista bare or nearly so ; wings lightly (usually) tinged with 



yellowish-brown, costa very long, reaching well beyond the middle, 



thickened on its outer third, fringe short, Ist thin vein comes off 



beyond the fork ; male hypopygium small, and protuberance yellow 



and papilla-like, lamella very long and slender; last abdominal 



segment of female produced beneath in a triangular curved process ; 



legs yellowish-brown, tibial spines weak. Frequents carrion ; taken 



in autumn, midwinter (December), and spring. 



2h mm. — perenms, Mg. 



9 (8) Halteres blacJc. 



J ? . Middle row of frontal bristles convex in front, arista 

 pubescent; costa reaching to the middle of wing or only a little 

 beyond, Ist thin vein comes off at the fork; anal protuberance black 

 or blackish, lamellae much shorter and broader than in perennis, last 

 abdominal segment of female normal ; tibial spines stronger than in 

 perennis; in all else resembles perennis, but is a smaller insect. Fre- 

 quents carrion ; taken in the autumn. 

 ^ l^_2mm. — vitrea,n.sp. 



10 (7) Legs of the ordinary form ; palpi bright yellow. 



? . Thorax and abdomen black, the former occasionally with a 

 reddish hue; halteres yellow and frons rather glossy; middle row of 

 frontal bristles convex in front, ari.ta finely pubescent ; wings as in 

 vilrea, but rather more deeply tinged with yellowish-brown ; last 

 abdominal segment of fen.ale produced into a triangular process as in 

 perennis ; legs yellow, tibial spines stronger than in perennis. Taken 

 in the autumn. ^^_^ mm.-luteifemorata, n. sp. 



11 (6) Scutellum with four strong bristles of equal size, or with the anterior pair 



reduced to the dimensions of coarse hairs. 



12 (15) Scutellum with equal bristles. Fore tarsi short and thick. 



13 (U) First abdominal segment $ much longer than 2nd segment, at least at 



sides, its hind margin emarginate {V-shaped) in both sexes. Female 

 proboscis normal. 



