Description and bioecology of two new species of the genus Cryncus (Orthoptera, Gryllidae, Gryllinae) from Cameroon with a key and distribution map of all African species

The genus Cryncus Gorochov, 1983 composed of African crickets is reported for the first time in Cameroon by the description of two new species collected at Zamakoe, Ongot and Engout'Adjap in the southern Cameroonian plateau during an inventory study of crickets carried out from March 2014 to September 2015. These new species are: Cryncus camerounensis Um Nyobe, Kekeunou Bilong Bilong sp. nov. and Cryncus desutterae Um Nyobe, Kekeunou Ma sp. nov. These descriptions bring the total number of species of this genus to 25. Cryncus camerounensis is distinguished by an irregularly shaped mirror, without a dividing vein, with a short apical field, while Cryncus desutterae is characterized by a divided oval mirror and a long apical field. Cryncus camerounensis was more abundant in the forest environment while Cryncus desutterae would exclusively colonize fallow land. This article is divided into two parts. The first part presents a description of the two new species, followed by a revised diagnosis of the genus Cryncus using both male and female characters and an identification key. The second part presents some bioecological data of these new species and a map of the geographical distribution of all known species of this genus.