Key to genera of Mnesicleinae from Borneo and Malay Peninsula (modified after Descamps, 1974a)

1. Abdomen with several anterior tergites specialised........................................................... 2

1’. Abdomen without specialised tergites (excluding apical tergites)................................................ 3

2. Male 1 st tergite extended backwards by a large truncated lobe; 8 th tergite with strong dorsal projection; last tergite not divided into three parts............................................................................ Borneacridium

2’. Male 1 st and 2 nd tergites protruding dorsal crest; 4 th and 5 th tergites with latero-posterior point; 8 th tergite without dorsal protrusion; last tergite divided into three parts................................. Tuberomastax

3. Dorso-median and -external carinae of hind femora armed with strong odontiform spines. Cerci right angled inward elbows......................................................................................... Odontomastax

3’. Dorso-median and -external carinae of hind femora armed with smaller and finer spines. Cerci sharply angled inward elbows................................................................................................... 4

4. Tegmina transparent; anterior margin bends towards the end. Hind wings elongated: maximum length / width ratio = 1.7–2.5............................................................................................. Uvarovia

4’. Tegmina coloured or opaque, at least at the basal part; anterior margin straight towards the end, slightly enlarged at the apex. Hind wings subcycloid: maximum length / width ratio = 1.3–1.5......................................... Mnesicles