A review of the genus Lankaphthona Medvedev, 2001, with comments on the modified phallobase and the unique abdominal appendage of L.binotata (Baly) (Coleoptera, Chrysomelidae, Galerucinae, Alticini).

The flea beetle genus Lankaphthona Medvedev, 2001 is redescribed and a new species L.yunnantarsella sp. nov. Ruan, Konstantinov & Prathapan is described. Longitarsella Medvedev, 2009, syn. nov. and Philotarsa Medvedev, 2009, syn. nov. are newly synonymized with Lankaphthona. Philotarsalaosica Medvedev, 2009, syn. nov. is synonymized with Lankaphthonaphuketensis (Gruev, 1989). The following new combinations are proposed: Lankaphthonabinotata (Baly, 1876), comb. nov.; Lankaphthonacostata (Medvedev, 2016), comb. nov.; Lankaphthonacyanipennis (Medvedev, 2017), comb. nov.; Lankaphthonanigronotata (Jacoby, 1896), comb. nov.; Lankaphthonanotatipennis (Medvedev, 2009), comb. nov.; and Lankaphthonaphuketensis (Gruev, 1989), comb. nov., status restored. A highly specialized spoon-shaped 'appendage' is discovered on the first abdominal ventrite of males of Lankaphthonabinotata. Aedeagus of the same species has aberrant sheath-shaped phallobase encircling the median lobe. Morphology and possible function of these structures are discussed. Menispermaceae are newly reported as the host plants of the genus.

Revision of the Oriental Chaetocnema species (Coleoptera, Chrysomelidae, Galerucinae, Alticini).

The Oriental species of Chaetocnema Stephens, 1831 are revised. There are 85 valid species, including 19 new species: C. angustifrons sp. nov.; C. appendiculata sp. nov.; C. baoshanica sp. nov.; C. dapitanica sp. nov.; C. glabra sp. nov.; C. greenica sp. nov.; C. jinxiuensis sp. nov.; C. hongkongensis sp. nov.; C. latapronota sp. nov.; C. midimpunctata sp. nov.; C. nigrilata sp. nov.; C. parafusiformis sp. nov.; C. paragreenica sp. nov.; C. paraumesaoi sp. nov.; C. purerulea sp. nov.; C. reteimpunctata sp. nov.; C. sabahensis sp. nov.; C. subbasalis sp. nov.; C. trapezoida sp. nov.                Fifteen new synonyms are proposed: C. assamensis Scherer, 1969 (syn. nov.) = C. hainanensis Chen, 1932; C. birmanica Jacoby, 1892 (syn. nov.) = C. malayana Baly, 1877; C. ebenina Warchalowski, 1973 (syn. nov.) = C. yiei Kimoto, 1970; C. flavipennis Medvedev, 1996 (syn. nov.) = C. granulicollis Jacoby, 1896; C. harita Maulik, 1926 (syn. nov.) = C. westwoodi Baly, 1877; C. himalayana Medvedev, 1993 (syn. nov.) = C. melonae Chen, 1934; C. kwangsiensis Chen, 1939 (syn. nov.) = C. hainanensis Chen, 1932; C. loriae Jacoby, 1905 (syn. nov.) = C. nigrica Motschulsky, 1858; C. nepalensis Scherer, 1969 (syn. nov.) = C. bella Baly, 1877; C. nitens Baly, 1877 (syn. nov.) = C. nigrica Motschulsky, 1858; C. placida Jacoby, 1896 (syn. nov.) = C. bella Baly 1877; C. shanensis Bryant, 1939 (syn. nov.) = C. bella Baly 1877; C. subcostata Jacoby, 1889 (syn. nov.) = C. wallacei Baly, 1877; C. vietnamica Chen Wang, 1980 (syn. nov.) = C. modigliani Jacoby, 1896; C. vietnamica Medvedev, 2009 (syn. nov.) = C. wallacei Baly, 1877.                C. vietnamica Medvedev, 2001 is a new junior homonym of C. vietnamica Chen Wang, 1980.                C. melonae Chen, 1934 status restored and resurrected from synonymy with C. duvivieri Jacoby, 1892 in Medvedev, 2001: 613. Two subspecies are raised to species level: C. taiwanensis Chûjô, 1965 new status for C. tonkinensis taiwanensis Chûjô, 1965 and C. yunnanica Heikertinger, 1951 new status for C. discreta yunnanica Heikertinger, 1951.                Lectotypes are designated for 25 species: C. minuta Jacoby, 1896; C. granulicollis Jacoby, 1896; C. kwangsiensis Chen, 1939; C. longipunctata Maulik, 1926; C. montivaga Maulik, 1926; C. basalis Baly, 1877; C. parvula Baly, 1877; C. nitens Baly, 1877; C. geniculata Jacoby, 1896; C. simplicifrons (Baly, 1876); C. sticta Maulik, 1926; C. sumatrana Jacoby, 1896; C. wallacei Baly, 1877; C. alticola Maulik, 1926; C. belli Jacoby 1904; C. cognata Baly, 1877; C. squarrosa Baly, 1877; C. concinnipennis Baly, 1877; C. malayana Baly, 1877; C. birmanica Jacoby, 1892; C. merguiensis Bryant, 1941; C. pusaensis Maulik, 1926; C. singala Maulik, 1926; C. westwoodi Baly, 1877; C. harita Maulik, 1926.