Male genitalia morphology in Myrmeleontidae has traditionally been insufficiently studied, although it has received increased attention for its diagnostic value in recent times. A neutral terminology has generally been applied in standard taxonomic practice, yet knowledge of an equivalent and stable terminology across taxa based on comparative morphology has been missing. Herein a detailed comparative morphology study with examples from most tribes within Myrmeleontidae, including owlflies (Ascalaphinae), attempts to relate external and internal genital structures based on a proposed groundplan for Neuroptera and Myrmeleontidae. We contend that a groundplan based on 10 abdominal segments, plus vestigial structures from an 11th segment, coherently depicts structural components across myrmeleontid taxa. A gonarcus, an element of Neuropterida amply referred in Neuroptera, is supported to represent the pair of abdominal appendages of segment X medially fused, with gonocoxite and gonostylus components. In most myrmeleontid taxa, basal (gonocoxites) and distal (gonostyli) components separate, with gonostyli positioned posteriorly with respect to gonocoxites, still united with translucent, lightly sclerotized tissue, forming a more or less conical structure, a proposed synapomorphy for the family. Ninth gonostyli are generally reduced (pulvini) and have migrated close to the base of gonarcus (10th gonocoxites). A pelta, also a potential synapomorphy for Myrmeleontidae, derives from paired setose surfaces of the 10th gonostyli, medially positioned (still evident in Bubopsis). Three structural types of gonarcus are diagnosed for illustrative purposes, as they may represent convergent constructs.

Se lleva a cabo una síntesis del conocimiento taxonómico y biológico que se tiene de la fauna de Mantispidae del estado de Morelos. Se listan 9 especies (Nolima infensa Navás, Climaciella brunnea (Say), Dicromantispa interrupta (Say), Dicromantispa sayi (Banks), Zeugomantispa minuta (Fabricius), Zeugomantispa virescens (Rambur), Plega banksi Rehn, Plega fratercula Rehn y Plega signata (Hagen)) y una morfoespecie (Plega sp. 1) en cinco géneros y tres subfamilias con distribución por municipio y región fisiográfica del estado; cinco especies representan primeros registros de distribución para el estado de Morelos.

A new antlion species, Tyttholeon froehlichi Tavares, Marquez and Contreras sp. n., is described from the Baja California Peninsula, Mexico, an area biogeographically significant for its high number of endemic species. Previously monotypic, Tyttholeon Adams now comprises two Nearctic species. Three of the four genera within the formerly recognized tribe Gnopholeontini and their respective species, all present in the Peninsula of Baja California (Gnopholeon barberi Currie, G. delicatulus Currie, G. zapotecus Stange, Menkeleon bellulus Banks, and Tyttholeon puerilis Adams), are herein diagnosed, illustrated, and have their distribution updated and analyzed. A taxonomic key is provided for Tyttholeon.

Two new species of Glenurus Hagen, 1866 are herein described. Glenurus maya sp. n. is described from Southern Mexico and Guatemala, and G. oswaldi sp. n. from the Antilles. A lectotype for G. heteropteryx Gerstaecker, 1885 is determined, and G. discors Navás, 1920 is revalidated as a valid species. Additionally, the previously described species known to Mexico and Central America are redescribed, and larvae of two species are described for the first time. Digital images and distributional maps are provided for all treated species, and an identification key to the genus is provided.

Herein we revalidate the subgeneric name Curriomyia Banks, 1939 and elevate it to the genus rank, encompassing two species, Curriomyia expansa (Navás, 1913) and C. yavapai (Currie, 1903), previously placed in Scotoleon Banks, 1913, based on morphological data, as well as molecular data from previous studies. The genus and both species are redescribed; an identification key for the Nearctic genera of Brachynemurini and updated distributional maps, are provided. The revalidation of this genus not only groups these two very distinct species together but also maintains Scotoleon as a monophyletic genus.