Abstract: To clarify the classification of the morphologically similar species Tetrix dentifemura and T. grossus, and Euparatettix erythronotus and E. jiuwa nshanensis, we analysed the morphology and DNA data of the four insects of the family Tetrigidae. The morphological comparision showed that there are a lot of common characteristics between T. dentifemura and T. grossus, but with major difference including the length of hind wings; for E. erythronotus and E. jiuwanshanensis, there are many common characteristics except little difference, in terms of the shape of frontal ridge, the places of antenna and lateral ocelli, and the length of posterior femora. The fragments of Cyt b, 16S rRNA and 18S rRNA genes were sequenced for 4 species from 2 genera of Tetrigidae. The united sequence of the 3 fragments is 2 902 bp in length. We found that the three fragment sequences of T. dentifemura and T. grossus were completely identical, and the three fragments of E. erythronotus and E. jiuwanshanensis were also identical. Combining the results of morphological comparison with gene sequence analysis, we proposed that the T. grossus should be treated as a junior synonym of T. dentifemura, and E. jiuwanshanensis should be treated as a junior synonym of E. erythronotus.

Key words: Tetrigoidea, Tetrigidae, taxonomic revision, new synonym, morphological characteristics, gene sequence, Cyt b, 16S rRNA, 18S rRNA