Leiobunum rotundum is at once betrayed by the length of its black legs. The body of the female, 5 to 7 mms. long, is a smooth oval shape, brown in colour, with a dark median dorsal band which is broadest posteriorly. The ocular tubercle is smooth and each eye is surrounded by a black ring. The body of the male is smaller and more rounded, and its uniform red-brown colouring is unrelieved by an median or other marking.

"(Savory)"