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From Chvala:

3 (2) Small species, 5-8mm…………………………..pusilla (Meig.)
Larger species 10-12 mm………………………. lacera (Meig.)
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5 (4) - Face with two narrow black stripes along the facial keel. First aristal segment small (fig. 25), the dark wing band does not reach up to the end of cell R2…………………………………………………... truncata (Loew)
- Face entirely yellow, first aristal segment obviously extended (fig. 26). dark wing band occupies the whole cell R2. . .. . . . .. chrysorrhoea (Meig.)

BTW I just caught a new species of conopid for the Netherlands last year near Amsterdam: Leopoldius valvatus......
Wil be published in NFM (a Dutch magazine)
Greetings