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Abstract>The status of the genus Plega is discussed and a preliminary survey of the North American species is presented. Plega yucatanae, a new species reared from the cells of Megachile exaltata Smith, is described and compared with its near relatives. The immature stages are described and biological information is given.

The genus Isostenosmylus Krüger, 1913 (Neuroptera: Osmylidae) is the most species-rich genus of lance lacewings in the Neotropical region. Seven species are newly described here (Isostenosmylus angustipennis, sp. nov., Isostenosmylus apaapensis sp. nov., Isostenosmylus barbatus, sp. nov., Isostenosmylus inca, sp. nov., Isostenosmylus jaguar, sp. nov., Isostenosmylus penai, sp. nov., Isostenosmylus triangulatus, sp. nov.). A neotype of Oedosmylus morenoi Navás, 1928 is proposed, the male of Isostenosmylus irroratus Ardila-Camacho et al., 2016 is newly described, and identification keys to males and females of Isostenosmylus species are provided. A morphological phylogeny and biogeographical analysis of the genus are also presented. Isostenosmylus is recovered as a monophyletic genus and species are divided in two main clades (named here as ‘bifurcatus’ and ‘pulverulentus’ clades); the greatest diversity of this genus is located in the Andean mountain range, where new studies should be focused on. http://zoobank.org/urn:lsid:zoobank.org:pub:7AA1CED6-D30D-4DE5-A45A-86C2F038B915

The Neotropical fauna of Mantispidae is currently composed of 106 species. We provide new distributional records of Mantispidae from Colombia and Panama. Three new species are described, one in Symphrasinae from Colombia, and two in Mantispinae from Colombia and Panama. Haematomantispa nubeculosa (Navás, 1933) and Leptomantispa axillaris (Navás, 1908) are reported from Colombia for the first time, the former being the first record of the genus in the country. New locality records for other species previously known from Colombia are also given. For Panama, we report Anchieta fasciatella (Westwood, 1867) and Trichoscelia iridella (Westwood, 1867) for the first time, the former is herein newly transferred from Plega to Anchieta. Three names Mantispa confluens Navás, 1914, n. syn., Buyda apicata Navás, 1926, n. syn., and Mantispa neotropica Navás, 1933, n. syn., are here synonymized with Buyda phthisica (Gerstaecker, 1885). Updated keys for the genera of Mantispinae, and species of genera Trichoscelia, Buyda, and Climaciella from Colombia are included. With this new information, the known species richness of Mantispidae from Colombia increases from 21 to 26, and from 16 to 19 species in Panama.

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