Caeca wanting; oil-gland tufted. Sternum with two shallow notches, one on each side in the posterior margin; behind the ill-developed manubrium is a perforation as in Meropidae. Both carotids present as a rule, though there are . exceptions. Spinal feather-tract not defined on the neck, which has no lateral bare tracts or apteria ; no aftershaft; no down on bare parts of skin. Deep plantar tendons as in Coraciae.