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The species of the former antlion subtribe Periclystina (Neuroptera: Myrmeleontidae) are revised. Prior to this work Periclystina comprised 10 genera and 63 species endemic to Australia (62 spp.) and New Guinea (1 sp.). In this work two former genera are synonymized and four new genera are proposed (for a total of 12 valid genera), and six former species are synonymized and 16 new species are proposed (for a total of 73 valid species). A parsimony analysis utilizing 62 morphological characters is used to infer phylogenetic relationships among all 73 species, and suitable outgroups. Based on the results of the phylogenetic analysis, the tribal and/or generic assignments of 55 (75%) of former Periclystina species are modified here. Periclystina and its two largest genera—Austrogymnocnemia and Glenoleon—were all recovered as polyphyletic in their former circumscriptions. Ten species—placed here in six genera: Anomaloplectron, Csiroleon, Fissuleon gen. nov., Franzenia, Fusoleon and Latileon gen. nov.—clustered phylogenetically with Acanthoplectron and are transferred to the tribe Acanthoplectrini. The remaining 63 species—placed in six additional genera: Austrogymnocnemia, Glenoleon, Megagonoleon gen. nov., Minyleon gen. nov., Periclystus and Riekoleon—form a monophyletic Periclystus genus group and are transferred to the tribe Dendroleontini. All 73 species are (re)described and illustrated. New identification keys are provided for the tribes of Dendroleontinae, for the Australian genera of Acanthoplectrini and Dendroleontini, and for each of the non-monotypic genera treated. In addition, five new lectotypes are designated and 35 new combinations are created.

A global synonymical checklist of the species and higher taxa of the insect order Megaloptera is provided. The checklist includes both extant and extinct taxa, and recognizes 2 families, 4 subfamilies, 48 genera, 425 species, and 6 subspecies. Both families (Corydalidae and Sialidae), and three of the four subfamilies (Corydalinae, Chauliodinae, and Sialinae) are known from both extant and extinct species; the Sharasialinae (Sialidae) is entirely extinct. Country-level geographic distribution data are provided for all species and subspecies. Synoptic type data are provided for taxa in the family and genus groups. Summary data are given for the numbers of megalopteran species currently known to occur in each of the major biogeographical regions of the world, and for the world fauna. Increase of knowledge about the diversity of the world Megaloptera fauna is summarized in counts of valid species described per decade and in a global taxonomic description curve. An updated set of keys to the world families, subfamilies, and genera of the Megaloptera is also provided.

Apertochrysa Tjeder, 1966, a new senior synonym of Pseudomallada Tsukaguchi, 1995 (Neuroptera: Chrysopidae: Chrysopinae: Chrysopini)

The cotton agroecosystem is one of the most intensely managed, economically and culturally important fiber crops worldwide, including in the United States of America (U.S.), China, India, Pakistan, and Brazil. The composition and configuration of crop species and semi-natural habitat can have significant effects on ecosystem services such as pollination. Here, we investigated the local-scale effect of crop and semi-natural habitat configuration in a large field (>200 ha in size) cotton agroecosystem on the diversity and abundance of native bees. The interfaces sampled included cotton grown next to cotton, sorghum or semi-natural habitat along with a natural habitat comparator. Collections of native bees across interface types revealed 32 species in 13 genera across 3 families. Average species richness metrics ranged between 20.5 and 30.5, with the highest (30.5) at the interface of cotton and semi-natural habitat. The most abundant species was Melissodes tepaneca Cresson (>4000 individuals, ~75% of bees collected) with a higher number of individuals found in all cotton–crop interfaces compared to the cotton interface with semi-natural habitat or natural habitat alone. It was also found that interface type had a significant effect on the native bee communities. Communities of native bees in the cotton–crop interfaces tended to be more consistent in species richness and abundance. While cotton grown next to semi-natural habitat had higher species richness, the number of bees collected varied. These data suggest that native bee communities persist in large-field cotton agroecosystems. Selected species dominate (i.e., M. tepaneca) and thrive in this large-field cotton system where cotton–crop interfaces are key local landscape features. These data have implications for potential pollination benefits to cotton production. The findings also contribute to a discussion regarding the role of large-field commercial cotton growing systems in conserving native bees.