Two new species, Symphytopterus graciler sp. nov. of the family Ephialtitidae and Praeaulacus byssinus sp. nov. of the family Praeaulacidae, are described and illustrated from the late Middle Jurassic of Jiulongshan Formation at Daohugou in Inner Mongolia, China. Based on new information on S. graciler sp. nov. and P. byssinus sp. nov., two taxonomic keys to the known species of genera Symphytopterus and Praeaulacus are provided. By comparing the wings of Symphytopterus, we find that the change of the veins length is the main interspecific difference and S. liasinus may occupy the most basal position in Symphytopterus.
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