The abundance of insects in Burmese amber illustrates a highly diverse insect community of the mid-Cretaceous, but the records of crickets are relatively rare. Here, we erect two new genera with two new species, Birmanioecanthus haplostichus gen. et sp. nov. and Apiculatus cretaceus gen. et sp. nov., based on two new specimens from northern Myanmar amber. These new species can be assigned to the subfamily Oecanthinae (Orthoptera: Gryllidae) by their prognathous head, slender body and metatibiae, and protibiae with large tympana. These new findings are the first and earliest fossil record of tree crickets and shed light on the evolution of Oecanithinae.

Mitius was initially described by Gorochov in 1985, using Gryllus flavipes (=Mitius flavipes) Chopard, 1928 as the type species. To date, nine species have been discovered across the world (Storozhenko, Kim & Jeon, 2015; Cigliano et al. 2021). Mitius castaneus (Chopard, 1937) and Mitius vaturu (Otte & Cowper, 2007) have truncate frons similar to Loxoblemmus Saussure, 1877, while the remaining seven species (Mitius blennus (Saussure, 1877), Mitius enatus Gorochov, 1994, Mitius eryuanensis Yuan, Xie & Liu, 2021, M. flavipes, Mitius minor (Shiraki, 1911), Mitius minutulus Yang & Yang, 1995, and Mitius splendens (Shiraki, 1930)) have a standard round frons. A new species with truncate frons that was discovered in Xizang autonomous region, China is described and illustrated in this paper.

We present the description of a new genus and new species of Trigonidiidae, Qiongqi crinalis gen. et sp. nov., found in amber deposits at Noije Bum, near Tanai in the Hukawng Valley of northern Myanmar. Its lateralized eyes, short clypeus, exposed mandible, and extremely dense setae entirely covering the body, provides us with new knowledge on the morphology of Trigonidiidae. Additionally, a key to species of fossil Trigonidiidae in amber was provided.