Diagnosis (species group “c”). The songs are constituted by numerous discontinuous chirps at the beginning followed by continuous syllables ( Figs 3 a–k).
Notes. According to the song characteristics ( Liu et al., 2019), M. hainanensis He, 2019, should be put into the species group.
Included species and subspecies. M. minor sp. n. ( East Asia), M. m. yunnana sub sp. n. ( China), M. hainanensis He, 2019 ( China).