Sialis fuliginosa
Sialis fulginosa is dark brown to black in colour. It has four membranous wings all unpatterned, uniformly brown in colour with dark veins. Wings are held roof-like over abdomen. The antenna shorter than the forewing. It has a body length of 10mm and a wingspan of 27-33mm.
To identify to species level you need to examine the genitalia.
Male genitalia: Tip of abdomen hinged (in vertical plane) opening up to reveal genital structures. Genital structures as in figure, Subgenital plate shorter than the tip of the abdomen.
Female genitalia: Tip of abdomen is rounded, without an opening. When viewed on the underside (ventral view) the Anal plates look like two large oval shapes.
Flowing waters (not torrents), often found on margins. Larvae aquatic.