Czerny, 1930:Male: frons narrowed anteriorly, frontal stripe rusty yellow, black around ocelli, in front of ocelli with a pointed whitish dusted triangle, reaching middle of frons. Eye margins whitish dusted anteriorly, lateral eye ridges and occiput black, with white dusting. 2-3 moderately long orbital bristles. Face and cheeks white, antennae rusty yellow, arista black, short plumose, plumosity decreasing in length towards apex, always bare at apex. Proboscis rusty yellow, palps whitish yellow. Thorax black, with thick grey dusting. Pilosity extremely short, whitish. Pleurae beneath whitish grey, sternopleuron with white hair band, above with 4 long hairs. Scutellum at edge with fine white hairs. “p” (?coxa) rusty yellow, shining, F1 and F2 apart from black apical rings with median dorsal blackish brown stripe, t2 and t3 very pale brown , tarsi strongly brownish. Wings somewhat brownish, calpters and halteres white. (Czerny, 1930) Abdomen shining black, short haired, robust. 2nd segment with a small black mark in middle of fore margin, and on left side with a dark mark covering 2 segments (? 2nd + 3rd). 4th sternite extraordinarily wide, strongly curved rusty yellow lamellae, with toothed hind margin
Identification of females:
Returning with Martin Drake to his original UK site in 2018 he took a single female. In his 2003 paper he had stated "None of the females collected unambiguously fitted the key characters used by RohaCek and Bartak (1990)" However the new specimen (which was photographed) clearly does not fit the description of N.cibaria (the other species in the couplet in the R&B key), the ovipositor sheath differs substantially, it is broad (from a dorsal view), tapering almost to a point and brown with paler brown patches. Most certainly not the black shiny cylinder with a kink typical of N.cibaria and not like the figure in R&B 1990.