Main characters of external morphology. A Achradocera apicalis, head and postpedicel. B A. excavata, legs. C A. angustifacies, head and postpedicel. D A. barbata, tarsomeres of foreleg. E A. meridionalis, tarsomeres of hind leg. F A. meridionalis, tibia of the mid leg. G A. insignis, tibia of mid leg. H A. tuberculata, tibia of mid leg. I A. tuberculata, femur of hind leg. J A. barbata, scanning electron microscope (SEM) of ventral postocular setae. K A. tuberculata, SEM of the midleg tarsomere. Abbreviation list: FIII, Femur of Leg III; It1, first tarsomere of Leg I; It2, second tarsomere of Leg II; IIt1, first tarsomere of Leg II; IIt2, second tarsomere of Leg II; IIIt3, third tarsomere of Leg III; IIIt4, fourth tarsomere of Leg III; pped, postpedicel (= first flagellomere); TII, tibia of leg II; v po s, ventral postocular setae.