Two new genera and species of fossil Palaeontinidae are described from Daohugou Village, Inner Mongolia, China： Cladocossus undulatus gen. et sp. nov. and Cricocossus paradoxus gen. et sp. nov. Both new genera are described based on well-preserved forewings. This discovery confirms the high diversity of palaeontinids during the Middle Jurassic. Both specimens have interesting modal structures which are new to Palaeontinidae： M five-branched and M3 with two branches. Based on this character, wing structural characteristic is discussed.
Two new species of lacewings are described and illustrated from the Jiulongshan Formation （Middle Jurassic） of Inner Mongolia, China： Leptolingia calonervis sp. nov. and Litholingia ptesa sp.nov. （Grammolingiidae）. The species can be distinguished by the following features： the outermost branch of MP2 on the hind wing did not reach the margin of wing in Leptolingia calonervis sp. nov.;the second branch of Rs forked deeply while other branches of Rs forked much later in Litholingia ptesa sp. nov..
Three new species of Chresmodidae are described. They belong to two different genera： Chresmoda multinervis sp. nov., Chresmoda shihi sp. nov. and Jurachresmoda sanyica sp. nov.. A study of the forewing venation is provided. Longitudinal veins are mostly parallel; costal area is broad at the basal and narrowing distally; ScP is probably extending close to the wing apex; R is parallel at length to ScP; MA is running close to R, with two long parallel branches; MA branched-off basally; while MP is not branched until the middle of the wing. However, the important basal part of MP and CuP is poorly preserved. In addition, unique fringing hairs on the mid legs of C. shihi sp. nov. and J. sanyica sp. nov. are described and compared with Jurachresmoda gaskelli Zhang, Ren and Shih, 2008.
A new genus and species Palaeodermapteron dicranum gen. et sp. nov. of the subfamily Dermapterinae and family Dermapteridae is described from the Middle Jurassic Jiulongshan Formation of Daohugou, Inner Mongolia in China. This article documents the earliest record of fossil earwig, extending the earwig existence to the Middle Jurassic. Detailed description and illustration of the specimen along with a brief review of the subfamily Dermapterinae are given. Evolutional trend of earwig morphology and its associated living environment are also discussed.
