Two new species of Meleonoma Meyrick, 1914a (Gelechioidea, Xyloryctidae) from southeastern China are described: Meleonoma foliiformis Yin, sp. nov. from Guangxi Province and M. projecta Yin, sp. nov. from Fujian Province. Adults and male genitalia are described in detail. A list of the Meleonoma species occurring in China is given. The taxonomic position of Meleonoma has been unstable, and under debate. Nonetheless, it is here tentatively placed in the family Xyloryctidae, following the latest molecular phylogenetic study concerning this genus.

The genus Lasiochira Meyrick, 1931 is reviewed, based on the specimens collected from China, Korea, and Vietnam. Of the eight species involved in this study, six are described as new: L. flavaterminata sp. nov., L. jianfengensis sp. nov., L. jiulongshana sp. nov., L. pallidiptera sp. nov., L. rosataenia sp. nov. and L. taiwanensis sp. nov. Photographs of adults and genital structures as well as the wing venation are provided, along with a key to all the known species.

The mitogenome of Ripeacma umbellata Wang, 2009 was reported in this study. It was 15,486 bps long and strongly AT biased, consisting of 13 protein-coding genes (PCGs), 22 transfer RNAs (tRNAs), 2 ribosomal RNAs (rRNAs), and 1 non-coding control region (351 bp). Most PCGs used the conventional ATN start codon, except for cox1 and cox2. Four genes used single T residue as stop codon rather than the routinely used TAA or TAG. All tRNAs, except for TrnS1, could fold into the cloverleaf secondary structure. Bayesian inference phylogenetic tree built on 13 PCGs from R. umbellata and another 21 species in Gelechioidea demonstrated that genus Ripeacma was a member in Autostichidae, which was consistent with the latest phylogenetic study.

Five species of the genus Meleonoma Meyrick are reported from Thailand. Meleonoma triangula Wang, sp. n., Meleonoma dorsolobulata Wang, sp. n., Meleonoma elongata Wang, sp. n., and Meleonoma bilobata Wang, sp. n. are described as new; Meleonoma facialis Li & Wang, 2002 is redescribed and recorded for the first time from Thailand.