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I have Stuart Ball's description of spinipes, which is: pale coloured, strongly spined front legs, marked wings (dark cloud over both anterior and posterior cross-veins and dark spot near apex of wing). Thorax mainly dull with 4 dark longitudinal spots, narrowly shining along dc rows. Abdomen shining with dark central stripe. Head mainly yellow, tiangular black patches on occiput either side of broad pale central line. Ocellar triangle dark. Antennae yellow. Legs entirely pale.

I get the impression that N tipularia is very similar though.