Xyela longula group

Diagnosis. Article 3 of maxillary palp 0.75–0.90 times as long as scape, clearly narrower than synantennomere 3; ovipositor 0.9–1.4 times as long as fore wing; medial part of valvula 3 diamond-shaped in cross-section (Figs 86, 95), dorsal and ventral edge of valvula 3 distally evenly narrowing to acicular tip, sensilla field absent (Fig. 87); penis valve without lateral lamella, upper edge of proximal and medial lobe at almost same level, lower ergot present (Fig. 126).

Species included. Xyela helvetica and X. longula in the West Palearctic.