Empididae. 51 



Female. Frons broad, grey. Abdomen grey, haired about as in 

 the male. the hairs somewhat shorter. Legs dark brown, knees nar- 

 rowly pale yellow, the hind tibiæ and tarsi normal both in shape 

 and colour; the legs are haired chiefly as in the male, but the hind 

 femora have no bristles and are ciliated above and below, and like- 

 wise the hind tibiæ. Wings broad, almost half as broad as long, 

 strongly brown fumigated. 



Length 4,5 — 5,5 mm. 



This species is at once recognised by the curiously shaped hind 

 legs and the genitalia in the male, and by the dilated wings in the 

 female, and by these characters it stands a little apart. 



Bh. vesiculosa is very rare here; I know only two specimens, one 

 taken in Ordru|) Mose many years ago (Jacobsen) and one in Jutland 

 at Allerup near Esbjerg on ^/g 1909 (Esben Petersen). 



Geographical distribution : — Northern Europe, towards the north 

 to northern Scandinavia, and in Finland; its southern limit lies in 

 Denmark, It seems on the whole to be a somewhat rare species and 

 is probably a spring species; Zetterstedt records it from '^^Id — ^^,'7, and 

 he has taken it on Salix. 



Remarks: I think it highly probable that this species is identical 

 with Bh. atripennis Zett. as suggested by Frey (Aet. Soc. pro Faun. 

 et Flor. Fenn. 31, No. 9, 1909, 20); the differences are only such 

 (colour of legs and wings) as may generally occur in species of Bhcmi- 

 phomyia. 



8. Rh. conformis Kow. 



1867. Kowarz, Verh. zool. bot. Gesell. Wien, XVII, 321, 3. — 1903. 

 Kat. palåarkt. Dipt. II, 224. — Rhamphomyia psendotrilineata: 1893. Strobl, 

 Mitth. Ver. Steierm. 1892, 49. 



Male. Eyes contiguous; the small frontal triangle blackish, grey 

 just above the antennæ; epistoma blackish. Occiput dark grey with 



^fOirziZZ 



Fig. 15. Antenna of Bh. conformis. X 65. 



black hairs. Labrum slightly longer than the head is high, black; palpi 

 not short. greyish black, with black hairs. Antennæ a little longer 

 than the head, black, the two basal joints with black hairs, the third 

 elongated, lancet-like, not much broader at the base than outwards. 



