Flight period: June to October (occaisonally early November)
This small heathland and moorland species is the only UK black dragonfly (males). The legs are entirely black. There is a constriction of the abdomen around S4, giving a club-shaped appearence. The pterostigma is black.
Male: become extensively black with maturity with a black frons and thorax. Some yellow markings remain along the sides of the abdomen and thorax.
Females and immature males: have a yellow abdomen and brown thorax marked with a black triangle on top. The side of the thorax and the lower part of the abdomen is strongly marked in black.