Mexican species of the genus Orthocentrus (Hymenoptera, Ichneumonidae: Orthocentrinae).

The Mexican species of the genus Orthocentrus Gravenhorst are reviewed. Fortytwo species of the genus Orthocentrus are described as new: O. areolatus sp. nov., O. aztecus sp. nov., O. brevicornis sp. nov., O. collaris sp. nov., O. contrerasi sp. nov., O. coronadoae sp. nov., O. dorsofuscus sp. nov., O. elongatus sp. nov., O. flavoorbitalis sp. nov., O. fuscipes sp. nov., O. hidalgoensis sp. nov., O. kasparyani sp. nov., O. khalaimi sp. nov., O. latus sp. nov., O. longiventris sp. nov., O. lopezi sp. nov., O. lostuxtlasi sp. nov., O. malaris sp. nov., O. mexicanus sp. nov., O. microphthalmus sp. nov., O. minor sp. nov., O. montanus sp. nov., O. montezuma sp. nov., O. oaxacae sp. nov., O. ocampo sp. nov., O. pictus sp. nov., O. podagricus sp. nov., O. rhombifer sp. nov., O. rufipleuris sp. nov., O. ruizi sp. nov., O. scabrosus sp. nov., O. scutellatus sp. nov., O. sierrae sp. nov., O. similis sp. nov., O. tamaulipecus sp. nov., O. tergalis sp. nov., O. tlaxcalensis sp. nov., O. ungularis sp. nov., O. varicolor sp. nov., O. veracruzus sp. nov., O. vulgaris sp. nov., O. zaldivari sp. nov. In total, 53 Orthocentrus species are now known to occur in Mexico, and 52 species are reported from Mexico for the first time. A key to all known species of Mexican Orthocentrus is provided and distribution maps are presented.

New species of the genus Gnathochorisis Förster (Hymenoptera: Ichneumonidae: Orthocentrinae) from the Neotropical Region.

The Neotropical species of the genus Gnathochorisis (Ichneumonidae: Orthocentrinae) are reviewed, seven species: G. enodis sp. nov., G. khalaimi sp. nov. from Mexico, G. intercalaris sp. nov., G. punctata sp. nov., G. rufa sp. nov., G. rufithorax sp. nov. from French Guiana, and G. dilleri sp. nov. from Peru are described and illustrated, and one species G. laticincta comb. nov. is transferred from the genus Symplecis. A key to the Neotropical Gnathochorisis species is provided.