Key to the apterous genera of Carventinae from Hainan Province, China

1. Spiracles II lateral and visible from above............................... .. Caiaptera Bai & Heiss, 2011 (Figs.31, 32)

- Spiracles II ventral.................................................................................... 2

2. Meso- and metanota fused to mtg I+II at middle, with a median longitudinal smooth ridge, flattened from anterior margin of mesonotum to anterior margin of tergal plate................... Notoplocaptera Usinger & Matsuda, 1959 (Figs. 33, 34)

- Metanotum separated from mtg I and II by thin transverse suture................................................ 3

3. Spiracles III lateral and visible from above................................................................. 4

- Spiracles III ventral or sublateral......................................................................... 5

4. Anterolateral angles of pronotum roundly produced over collar, median thoracic sclerite bottle-shaped, surface smooth, vltg VII of male with a small shiny callus near spiracle VII, pygophore narrowly elongate posteriorly.................................................................................... Paralibiocoris Bai, Heiss & Cai, 2018 (Figs. 35, 36)

- Anterolateral angles of pronotum truncate not produced over collar, median thoracic sclerite of conical shape, surface granulate with longitudinal sulcus; vltg VII of male with large oblique shiny raised callus across whole vltg, pygophore shorter, rounded posteriorly............................................... Neolibiocoris Bai, Heiss & Cai, gen. nov. (Figs. 1–15)

5. Spiracles II to IV ventral, V to VII lateral and visible from above........ Crassocoris Bai, Heiss & Cai, 2007 (Figs. 37, 38)

- Spiracles II ventral, III to IV sublateral, IV faintly visible from above, V to VII lateral and visible from above............ 6

6. Lateral margins of thoracic segments not incrassate, each showing two parallel layers in lateral view......................................................................... Rotundocoris Bai, Heiss & Cai, 2019 (Figs. 16-30, 39, 40)

- Lateral margins of thoracic segments incrassate, each showing three parallel layers in lateral view............................................................................................ Oblongocoris Bai, Heiss & Cai, 2020