Key to the species of Cyriotasiastes (Newman 1842)

1 Female with antennomeres III to VII or VIII, two-toned, with band of whitish recumbent pubescence near basal end or basal half of antennomeres, the other basal half covered with black recumbent pubescence; antennomere III shorter than antennomeres IV and V................................................................. C. mindorensis Vives 2009 (Fig.1C)

Female antennomeres III to VI two-toned, with band of whitish recumbent pubescence near basal end or basal half, the other basal half covered with black recumbent pubescence; antennomere III to V of the same length........................ 2

2 Elytra with C-shaped postmedian band.................................................................... 3

Elytra with Straight postmedian band..................................................................... 4

3 Thick C-shaped postmedian elytral band; frons with long erect black setae randomly arranged; prosternum thinly covered with yellowish recumbent pubescence................................... C. solsonanensis Medina et al. 2023 (Fig. 1A)

Very thin C-shaped postmedian elytral band; frons free of long erect setae; prosternum densely covered with recumbent and semi-erect whitish pubescence............................................ C. rhetenor (Newman 1842) (Fig. 1G)

4 metepisternum acute shaped, base without depression, body matte black.............. C. mindanaonis sp. nov. (Fig. 1H)

metepisternum elongated triangular shaped, base with depression, body dark brown................................................................................................... C. panayensis Barševskis 2018 (Fig. 1D)