1	Pronotal lateral margin explanate throughout pronotal length, translucent	2
–	Pronotal lateral margin narrowly reflexed, edge narrowly upturned or beaded adjacent to pronotal lateral seta	3
2	Pronotal margin broadly explanate entire pronotal length, sinuate anterad hind angle	Mecyclothorax perraulti sp. n.
–	Pronotal margin broadest near posterior angle, narrowed anterad toward position of lateral seta, not sinuate anterad the broadly rounded hind angle	Mecyclothorax pahere sp. n.
3	Pronotum cordate, margin distinctly sinuate anterad hind angle	4
–	Pronotum ovate, margin straight to slightly convex anterad obtuse hind angle	Mecyclothorax menemene sp. n.
4	Both anterior and posterior supraorbital setae present, a thin carina present between dorsoanterior margin of eye and anterior seta	5
–	Posterior supraorbital seta present, anterior supraorbital seta absent, only a low broad convexity mesad dorsoanterior margin of eye	Mecyclothorax mahatahi sp. n.
5	Pronotum bisetose, both lateral and basal setae present; pronotum moderately cordate, MPW/BPW ratio 1.52–1.64, pronotal lateral margins subparallel to slightly divergent anterad obtuse-rounded hind angles	6
–	Pronotum unisetose, only the lateral seta present, hind angle glabrous; pronotum distinctly cordate, MPW/BPW ratio 1.67– 1.76, pronotal lateral margins convergent for ~¹�₉ pronotal length anterad sharply right hind angle	Mecyclothorax popotioaoa sp. n.
6	Body size larger, standardized body length 4.7–5.0 mm; a single dorsal elytral seta present at ~0.25 distance from base of scutellum to elytral apex; both apical and subapical elytral setae present	Mecyclothorax mapo sp. n.
–	Body size smaller, standardized body length 3.8–4.4 mm; two dorsal elytral setae positioned at ~0.32–0.34 and ~0.66–0.68 distance from base of scutellum to elytral apex; apical elytral seta (apex 2nd stria) present, subapical elytral seta (in 7th stria) absent	Mecyclothorax fatata sp. n.