A revision of the Cretaceous ant genus Zigrasimecia Barden & Grimaldi, 2013 (Hymenoptera: Formicidae: Zigrasimeciinae).

The extinct Cretaceous ant genus Zigrasimecia Barden & Grimaldi, the iron maiden ants from Myanmar, is revised, and five new species are described: Z. boudinoti sp. nov., Z. caohuijiae sp. nov.,Z. chuyangsui sp. nov., Z. perrichoti sp. nov., and Z. thate sp. nov. Zigrasimecia hoelldobleri paratype (CNU-HYM-MA2019054) is removed from the type series. New diagnoses for all species are provided and species boundaries are discussed. Studied specimens that are not ideally preserved are presented and discussed, some of them are putative new species. Two identification keys for the genus are provided, a traditional, dichotomous key and an interactive, multi-entry key hosted online at the website www.Xper3.fr. I briefly discuss the unlikeliness of the genus Boltonimecia to belong to the subfamily Zigrasimeciinae, and also the taxonomic problem caused by the description of species based on alates and poorly preserved fossils.

First record of Mayetiini (Coleoptera: Staphylinidae: Pselaphinae) from Brazil, with the description of a new macropterous and macrophthalmic species of Mayetia Mulsant amp; Rey, 1875.

Mayetia atlantica sp. nov., the third Neotropical and first Brazilian species of Mayetiini Scheerpeltz, 1925, is described. It is the third macropterous and macrophthalmic species of the genus, alongside M. peruana Orousset, 1995 (Neotropical) and M. nepalensis Orousset, 1995 (Oriental). The new species is known from three forest remnants of the Brazilian Atlantic Forest, in the states of Esprito Santo, Minas Gerais (both in Southeast Brazil) and Bahia (Northeast Brazil), being the southernmost record of Mayetia in the New World. The description of M. atlantica is based mostly on females, but includes the first known male macropterous and macrophthalmic Mayetia. In this work, the tropical diversity of the genus is increased and its Neotropical distribution is greatly enlarged.

Redescription of Eurhopalothrix reichenspergeri (Santschi, 1923) stat. rev. (Hymenoptera: Formicidae), a Brazilian Atlantic Forest endemic species.

Eurhopalothrix reichenspergeri (Santschi, 1923) stat. rev. is resurrected from synonymy with E. gravis (Mann, 1922). In Brown Kempfs tribal basicerotine revision of 1960, Rhopalothrix reichenspergeri was transferred to the genus Eurhopalothrix and synonymized into the species E. gravis. Eurhopalothrix gravis became, from that moment until now, the species with the largest distribution in the genus. After the present work, E. gravis has a Central American and north South American (Colombia) distribution, while E. reichenspergeri is restricted to the Brazilian Atlantic Forest. A key to the workers of the southern South American Eurhopalothrix species is provided. The male of E. reichenspergeri is described and compared to the male of E. gravis, E. floridana Brown Kempf, 1960 and the putative male of E. spectabilis Kempf, 1962.