UK. J, I.N I NAI HIST., 13: 2001 



Exechiopsis (Xenexechia) membranacea (Lradstrom) 



The male genitalia were figured by (aspers (1984). Il had previously been confused 

 with the frequent E. leptura (Meigen) and separation of females of these species is 

 still uncertain. E. membranacea has been recorded at a do/en sites, both woods and 

 wetlands, in southern ENGLAND: Somerset. Wilts. Hants. Herts. Berks. Oxon. 

 Bucks, Hunts and Lcics. 



Dynatosoma nigromaculatum Lundstrom 



Chandler (2000) corrected the suggestion by Chandler (1998c) that this species was 

 a synonym of D. abdominale (Staeger, 1840). Sevcik (in press) has shown that there 

 are small differences in the medial part of the gonostylus between these species and 

 D. schachti Plassmann (1999), which also has very similar genital structure 



Dynatosoma norwegiense Zaitzev & Okland 



Dynatosoma thoracicum: Landrock, 1930, not (Zetterstedt, 1838) 



This species was recorded by Chandler (1994b) on specimens from Buckleburv 

 Common, Berks. It was obvious that the figures by Landrock (1930) represented it. 

 but did not correspond to thoracicum (Zetterstedt, 1838) as figured by Zaitzev ( 1986). 

 whose identification was confirmed by Kallweit (1990), who examined Zetterstedfs 

 type. Zaitzev & 0kland (1994) described norwegiense from Norwegian material and 

 did not mention Landrock's paper, but it is considered from comparison of British 

 material with their figures that they are conspecific although the mesoscutum is 

 described as yellowish brown with two indistinct dark stripes while British material 

 has it uniformly orange brown. The synonymy of this group of the genus is. however, 

 uncertain and the identity of three other Zetterstedt names requires clarification. 



Sevcik (in press) records norwegiense from Slovakia and there is a male in BMNH 

 from Austria, labelled "Hochobir, Car. Mader" (no collector or date). 



British material of D. norwegiense: 



ENGLAND: Berks, Bucklebury Common, L2.vii.1989, 1 male (A.E. Stubbs) and 

 6.vi.l993, 1 female (Chandler); Berks, Windsor Forest, 15.viii.1994. Malaise trap. 1 

 female (via J. Brock); Herts, Ashridge Estate, 8.vii.l999. 3 males (Chandler): Hants. 

 New Forest, The Knowles, 16.vii.1995, 1 female and Denny Wood, 9.vii.l998, 1 male 

 (I. Perry). 



Mycetophila deflexa sp. n. 

 Mycetophila gratiosa: Chandler, 1988, misidentification. not Winnertz, 1863 



Male. Head dark brown, grey dusted. Antenna brownish yellow to basal half of 

 first flagellomere, rest brown; flagellomeres about twice as long as broad. Palpus 

 yellowish brown. 



Thorax shining dark brown with narrow yellow humeral area on each side and 

 yellow prothoracic spiracular area. Decumbent mesoscutal and anepisternal setae 

 yellow, stronger marginal setae including postalar, prescutellar, 2 pairs of strong 

 scutellars and strong setae on prothorax dark brown: shorter brown setae on 

 posterior part of anepisternum, upper margin of anepimeron and on laterotergitc. 



