Myiobia. 531 



fifth segment almost quite black. Abdomen is black-haired; second 

 segment withoiit bristles, third with a pair of discai and marginal and 

 fourth with a pair of discai and a row of marginal. Legs black, tibiæ 

 more or less brownish or reddish. Wings a little yellowish tinged and 

 yellowish at base ; veins yellowish brown ; subcostal vein with bristles 

 on outer half, cubital vein in most of the length, and postical vein 

 about half way to posterior cross-vein. Squamulæ white. Halteres 

 yellow. 



Female. Similar; coloiir often more yellowish; frons still broader; 

 sometimes an outwards directed bristle outwards to the uppermost 

 frontal. Antennæ with basal joints red. 



Length 6,5 to fully 8 mm. 



B. spreta is rare in Denmark, and only taken at Gilleleje (I. C. 

 Nielsen), on Lolland at Maribo (Sønderup), and in Jutland at Sønder- 

 borg (Wiistnei); the dates are in July to ^^J^. 



Geographical distribution: — Europe; towards the north to 

 southern Sweden. 



130. Myiobia R. D. 



Elongated species of medium size, and of greyish colour, more 

 or less yellow on sides of abdomen, especially in male. Head only 

 slightly broader than thorax, slightly convex or nearly flat behind, 

 somewhat puffed out below, higher than long. Frons either narrow 

 in male broad in female, or broad and of about the same breadth in 

 both sexes, a little or somewhat protruding. Jowls not broad, from 

 one sixth to one third of the heighu of the eye. Ocellar bristles more or 

 less weak; when the frons is narrow in male, there are only inner but 

 no outer vertical bristles and no orbitals, when broad there are also 

 outer vertical and two or three orbital bristles (Micromyiobia B. B.); 

 in female both pairs of vertical and two or three orbital bristles. 

 Distinct but somewhat small postocellar and occipital bristles. Behind 

 postocular bristles black hairs. Frontal bristles descending to or 

 about to end of second antennal joint, in the male with broad frons 

 and in female the uppermost directed outwards, in the male with 

 narrow frons all crossing. Cheeks bare. Vibrissæ not ascending. Eyes 

 bare or very sparingly pubescent. Epistoma somewhat low, a little 

 retreating, reflected and somewhat protruding below. Proboscis of 

 medium length, slender, labellæ not small; palpi thread-like or in 

 female a little dilated at apex. Antennæ inserted about at middle of 



34^ 



