Hind margin of pronotum. A, B, O. harpaloides (A: North Slob, Wexford, Ireland, voucher DNA2759, B: Halve Maan, Oostende, Belgium, voucher DNA2853). C, D. O. tachysoides (B: Belvoir Forest, Belfast, Northern Ireland, voucher DNA2763, D: Murlough NNR, Co. Down, Northern Ireland, voucher DNA2899). Scale bar 0.1 mm.