Facial coloration of the female holotypes of A. Mopla rubra and B. M. guttata, showing the expanded terminal segments of the labial palps, and the difference in structure of the frontal ridges. The frontal ridge of guttata is almost devoid of medial sulcus, only a trace at the extreme ventral margin is apparent. In rubra there is a faint sulcus over the entire length. Photo credit: L.D.C. Fishpool.