UK. I. I-.N'I. NA'I. IIISI., 6: 1993 



Table 1 . Lengths of the wing, thorax (measured from its front end to the tip of the postnotum). 

 and total body (mm). The wing and thorax were measured to the nearest 0.05 mm and the range 

 quoted to the nearest 0.1 mm, and the total length to the nearest 0.25 mm. The dimensions were 

 measured on at least ten specimens of each sex of the frequently occurring species 



Wing 



Female 



Thorax 



Total body 



Male 



Female Male 



Female 



Male 



O. florum 

 O. germinationis 

 O. lineatopunctata 

 O. petrei 

 O. punctata 

 O. punctella 

 G. angustipennis 

 G. apicalis 

 G. balachowskyi 

 G. breviseta 

 G. hackmani 

 G. hendeli ? 

 G. majuscula 

 G. subnigra 

 G. tripunctata 

 G. venusta 



4.4-5.1 



3.6-4.1 



2.8-3.8 



3.9-4.3 



3.4-4.3 



3.0 



2.8 



2.1-2.4 



2.3-2.7 



2.4 



3.0-3.8 



2.3-2.7 



2.6-3.4 



3.3-3.7 



3.8-4.4 



3.5-3.8 



2.7-3.5 



3.8-4.3 



3.2-3.9 



2.9 



2.8 



1.9-2.7 



2.6-3.1 



2.4-2.6 



2.8-3.2 



3.5 



2.2-2.7 

 2.7-3.4 

 3.2-3.6 



1.9-2.1 



1.6-1.9 



1.2-1.5 



1.8-2.0 



1.5-1.8 



1.3 



1.0 



0.9-1.5 



1.1-1.4 



1.1-1.2 

 1.7-1.9 

 1.1-1.4 

 1.1-1.5 

 1.4-1.8 



5-1.9 



.6-1.8 



.0-1.4 



.7-1.8 



.3-1.6 



.2 



.15 



.9-1.1 



.1-1.5 



.9-1.2 



.3-1.5 



9-1.3 



0-1.4 

 4-1.7 



4.5-5.75 



4.25-5.0 



3.25-4.25 



4.25-5.0 



3.75-5.0 



3.3 



2.75 



2.75-3.25 



3.0 



4.25 



2.75-3.75 



3.25-3.75 



3.25-4.0 



3.75-4.5 



3.75-4.75 



2.75-3.75 



4.0-4.75 



3.25-4.0 



3.15 



2.9 



2.3 



3.0-3.75 



2.5-3.0 



3.25-3.75 



4.25 



2.5-3.25 

 2.5-3.75 

 3.5-4.0 



which very occasionally also has extra veins and spots before the r-m crossvein but 

 is distinguished by having a dorsal thoracic stripe. 



Opomyza punctella would appear to be a species of cooler climates. Most records 

 come from northern European countries. Although it is probably rare throughout 

 most of its range, Hackman (1958) listed many localities for it in Finland and 

 implied that it was frequent there. In central Europe, it is confined to mountainous 

 areas and all Martinek's (1978a) Czechoslovakian records came from localities over 

 1000 m. The British distribution fits a similar pattern, with all records coming from 

 Scotland (Grampian, Strathclyde) and northern England (South Yorkshire. Durham, 

 Northumberland), though one is from coastal dunes. Its host plant is not known. 

 Apart from one record in early September, all dates of capture are in July. The species 

 is classified as vulnerable in Shirt (1987) and down-rated to rare by Falk (1991). 



Geomyza angustipennis Zett., 1847. Both crossveins and the adjacent membrane 

 are completely pale, making this small species distinctive. The first two tergites and 

 bases of the others are orange. Gibbs (1989) gives a full description of the female. 

 I have seen only two specimens and one of these is from Yugoslavia so the ranee 

 of variation is not known. The drawing of the male genitalia (Fig. 3a) is of 

 the Yugoslavian specimen in the Natural History Museum, London. Two other 

 European species, G. adusta Loew and G. denigrata Czerny, may key out at the same 

 couplet as angustipennis but both have dark thoraxes and only vaguely darkened wing 

 tips so look superficially more like G. breviseta or G. subnigra. 



The only known records are from the edge of a cornfield at Soakham, Kent 

 (Andrewes, 1964), Lady Park Wood (deciduous), Gwent (Gibbs, 1989), and an 

 unconfirmed record from Speybridge, Highland (Gibbs, 1989). It is classified as 

 endangered in Shirt (1987) and downgraded to rare by Falk (1991). 



