Thorax slate-grey, pattern indistinguishable; scutellum with two dark triangular areas which are contiguous at their upper inner angles. Abdomen with the darker blotches on each side of the second segment very faint ; on the other segments the banding is not a prominent feature, as it is in the typical form; the bands olive-grey, their margins being distinct and defined from the ground-colour, which is a few shades lighter. In the middle line the banding is cut off square, leaving a very narrow straight line down the centre of the segments ; the outer margins of the bands sloping away from below upwards and leaving light areas on each side. Legs with all the joints of the front and middle tarsi pale, except the distal end of the latter which has a faint darkish ring ; the last two joints of the hind tarsi faintly dark, but nothing like so dark as in G. morsitans. Wings tinged with light yellowish-brown.