https://www.naturespot.org.uk/species/fever-fly Length: 3.5 to 8 mm. Similar to the St Mark's Fly but not as hairy and with a ring of spines at the tip of the front tibia. The female has tinted wings - except for the tips, whilst the male has clear wings with a black stigma. Both males and females can be distinguished from other Dilophus species by having two rows of sub-medial spines on the front tibia, in addition to the apical ring. The lower row is usually just a single spine and generally on the dorsal side.
