Description of a new Mexican endemic subgenus of Strigoderma Burmeister with six new species (Coleoptera, Melolonthidae, Anomalini)

A new subgenus of the genus Strigoderma Burmeister, 1844, Costatergus Ramírez-Ponce & Andalco-Cid subgen. nov., is proposed to accommodate S. costulipennis Bates, 1888, and S. tenebrosa Delgado & Mora-Aguilar, 2012, as well as six other unpublished species, which are characterized by finely tumescent elytra with notable longitudinal ridges: Strigoderma (Costatergus) paucipunctata Andalco-Cid & Ramírez-Ponce subgen. et sp. nov., S. (C.) julianii Andalco-Cid & Ramírez-Ponce subgen. et sp. nov., S. (C.) grossipenis Andalco-Cid & Ramírez-Ponce subgen. et sp. nov., S. (C.) uniungula Andalco-Cid & Ramírez-Ponce subgen. et sp. nov., S. (C.) vulcanica Andalco-Cid & Ramírez-Ponce subgen. et sp. nov., S. (C.) borealis Andalco-Cid & Ramírez-Ponce subgen. et sp. nov. At the species level, the most important diagnostic characters are highlighted, concentrated in the shape of the inner protarsal claw, the punctation of the pronotum, the pattern of the elytral ridges and the simple genitalia. The subgenus Costatergus is endemic to Mexico, with a clear Typical Neotropical Distribution Pattern on the Mexican Pacific slope.