Empididae. 69 



This species will be recognised among the Danish species witli- 

 out difficulty; the male shows resemblance to the male of hybrida, 

 but the latter is a smaller species with still darker wings, and besides 

 it differs by other characters, mentioned under this latter species; the 

 female only might be confused with the female of variahilis, but this 

 has no acrostichal bristles. The species is also like sciarina which is 

 not hitherto tound in Denmark, but this is a much smaller species, 

 (and perhaps it is only a synonym to hyhrida, see under this species). 



Bh. culicina is very rare in Denmark, only one single specimen, 

 a male, has been taken earlier; no locality is given for it. 



Geographical distribution : — Northern and middle Europe, down 

 into France; towards the north to northern Scandinavia but there 

 becoming rare; and in Finland, According to Zetterstedt it occurs 

 on leaves and on flowers of UmbelUferæ on shaded piaces; it is an 

 autumn species, Zetterstedt gives the dates Vs — ^/a. 



18. Rh. hybrida Zett. 



1838. Zett. Ins. Lapp. 572,46. — 1842. Zett. Dipt. Scand. I, 438,63. 

 — 1903. Kat. palåarkt. Dipt. II, 226. 



Male. Eyes contiguous, the very small frontal triangle dark 

 brownish; epistoma short, pale brown. Occiput dark grey, with black 

 hairs. Labrum a little longer than the head is high, thin, ferruginous; 

 palpi yellow. Antennæ shorter than the head, black, the two basal 

 joints may be dark brownish, they are not distinctly hairy, the third 

 joint elongated, somewhat attenuated towards the apex. Thorax 

 velvet black or brownish black, with slight traces of a pair of less 

 dull stripes in the middle. The dorsocentral bristles of moderate 

 length, uniserial; the acrostichal bristles short and very inconspicuous, 

 they are biserial or irregularly uniserial ; all the bristles black. Further 

 a humeral bristle, a posthumeral, generally two notopleural, a supraalar 

 and a postalar bristle, all black. Scutellum greyish brown, with four 

 black marginal bristles. Pleura greyish or yellowish brown, meta- 

 pleura with brown hairs. Abdomen relatively slender, velvet black, 

 sometimes slightly brownish black, and it may be brownish down the 

 sides. Venter yellow. Abdomen somewhat sparingly clothed with 

 black or brownish hairs which are short above, longer and erect at 

 the sides; those at the hind margins of the segments a little stronger 

 than the others; venter sparingly haired with short hairs. Exterior 

 genitalia small and inconspicuous, the lower lamellæ somewhat blade- 

 shaped, the upper lamellæ directed upwards and likewise somewhat 

 broad; both pairs somewhat shining. Penis a short, upwards curved, 

 thick thread, not protruding. Legs somewhat long and slender, 



