On the genus Gastrodynerus Bohart, 1984 (Hymenoptera: Vespidae: Eumeninae).

The genus Gastrodynerus is here revised based on external morphology and male genitalia. Bohart (1984) proposed Gastrodynerus as a new genus with three species: G. vanduzeei (Bohart 1948), G. searsi Bohart, 1984, and G. stangei Bohart, 1984. Later, Rodriguez-Palafox (1996) added G. tacubayae (de Saussure, 1857). Herein, we describe four new species from Central America and South America: G. guatemalensis sp. nov.; G. barretti sp. nov.; G. aimara sp. nov. and G. yungaensis sp. nov. After this taxonomic revision, the Gastrodynerus includes eight species widely distributed in the New World. An identification key is provided for all of the species.

Taxonomic Review of Eumenes Latreille, 1802 (Hymenoptera, Vespidae, Eumeninae) from the New World.

The genus Eumenes Latreille, 1802, from the New World, is revised based on external morphology and male genitalia. New synonymy is proposed as follows: E. aureus Isely, 1917 = E. americanus de Saussure, 1852; E. bollii oregonensis Bequaert, 1838, and E. b. ehrenbergi Zavattari, 1912 = E. bollii Cresson, 1872; E. consobrinus pedalis Fox, 1894 = E. consobrinus de Saussure, 1855; E. crucifera bolliformis Viereck, 1908, E. c. nearcticus de Saussure, 1855 and E. c. stricklandi Bequaert, 1944 = E. crucifera Provancher, 1888; E. smithii belfragei Cresson, 1872 = E. smithii de Saussure, 1852; E. verticalis coloradensis Cresson, 1875, E. v. neoboreus Bequaert, 1944, E. v. tricinctus Isely, 1917 = E. verticalis Say, 1824. Eumenes flavitinctus Bohart, 1950, revised status, is no longer a subspecies of E. crucifera but elevated to specific level. Eumenes brunneus is elevated to the specific level and a new name is proposed because of homonymy, E. bequaerti Grandinete Carpenter nom. nov. An identification key for all the species of the genus from the New World is provided and the geographical distributions are updated.

Three new species of tribe Odynerini (Hymenoptera, Vespidae, Eumeninae) from the Neotropical Region.

Three new species from the Neotropical region are described: Ancistroceroides soikai Grandinete & Carpenter, sp. nov. (Costa Rica, Paraguay); Cephalastor huautla Grandinete & Carpenter, sp. nov. (Mexico), and Symmorphus centralis Carpenter & Grandinete, sp. nov. (Costa Rica).

Additions to the checklist of Scoliidae, Sphecidae, Pompilidae and Vespidae of Peru, with notes on the endemic status of some species (Hymenoptera, Aculeata).

The first checklist of the Peruvian Hymenoptera listed 1169 species and subspecies of aculeate wasps, including 173 species of Pompilidae, seven of Scoliidae, 39 of Sphecidae and 403 of Vespidae. Herein are reported 32 species as new for Peru based mainly on the collection of the Natural History Museum, London. The loss of the endemic status of two species is also reported: Entypus peruvianus (Rohwer) (Pompilidae: Pepsinae) and Omicron ruficolle schunkei Giordani Soika (Vespidae: Eumeninae).