Darwin wasps of the genus Seticornuta Morley, 1913 (Ichneumonidae: Metopiinae) in the Neotropical region, with a key to species Author Alvarado, Mabel Departamento de Entomología, Museo de Historia Natural, Universidad Nacional Mayor de San Marcos, Av. Arenales 1256 Jesús María, Lima 14, Perú and Bosque Llaqta, Avenida Confraternidad Internacional Este N ° 364, Huaraz, Perú. malvaradog@unmsm.edu.pe text European Journal of Taxonomy 2022 2022-10-10 839 149 175 http://dx.doi.org/10.5852/ejt.2022.839.1939 journal article 165035 10.5852/ejt.2022.839.1939 0031102a-1f65-422c-987f-0c370fc5f518 2118-9773 7195158 E4615884-F227-4551-AB5A-A60482E8DE37 Seticornuta nigroflava sp. nov. urn:lsid:zoobank.org:act: 5293728A-9434-4967-8709-4DD333EB0F5E Figs 7 , 10D , 11A Diagnosis This species can be recognized by this combination of features: pronotum yellow but centrally black, mesoscutum yellow with three black vittae, and metapleuron three-sided with the margin evenly declivous. Etymology The specific epithet ‘ nigroflava ’ is from the Latin ‘ nigra ’, meaning ‘black’, and ‘ flava ’, meaning ‘yellow’, in reference to the entirely black and yellow body of this species. Fig. 7. Details of Seticornuta nigroflava sp. nov. , ♀, holotype (SEMC). A . Habitus, lateral view. B . Facial view C . Head dorsally, mesoscutum, propodeum and first metasomal tergite. Material examined Holotype GUATEMALA • ♀ ; “ GUATEMALA : Huehuetenango : Puerta del Cielo 3400m 15.55307 -91.60338 14-VI-2015 ZHFalin ex. Eryngium guatemalense flowers in forest GUAT1F15 123/ SEMC1461629″; SEMC . Description Female MEASUREMENTS. Body length 7.3 mm . Fore wing length 6 mm . HEAD. Face+clypeus 0.9 × as wide as long; labrum not exposed when mandibles closed; malar space 0.8 × as long as basal mandibular width; lateral ocellus separated from compound eye by 1.1 × ocellar diameter; distance between ocelli 1.2 × maximum ocellar diameter; head posteriorly behind ocellar triangle concave; gena, on lateral view 1.1 × as long as compound eyes; occipital carina complete; antenna with 28 flagellomeres, ratio of length from second to fourth flagellomeres: 1.3:1.2:1.2, subapical flagellomere 1.3 × as long as centrally wide. MESOSOMA. Epicnemial carina interrupted subapically; metapleuron rectangular, dorsal margin weakly declivous and posteriorly evenly declivous, polished, glabrous; submetapleural carina smooth, anteriorly expanded into a conspicuous rounded lobe. Propodeum with lateromedian longitudinal carina strong, slightly closer subbasally; lateral longitudinal absent; posterior transverse carina absent between lateral and lateromedian longitudinal carinae. Fore wing with Cu1a between Cu1b and 2m-cu 1.5 × as long as Cu1 between Rs&M and 1m-cu. Hind wing with distal abscissa of Cu1 sclerotized throughout, abscissa of M faint. METASOMA. Metasoma with tergite I 1.2 × as long as posteriorly wide, lateromedian carinae extending 0.2 × length of tergite; tergite II 0.9 × as long as posteriorly wide; laterotergite II 0.5 × as long as wide, wedge-shaped, mesal edge convex; laterotergite III 0.5 × as long as wide, semicircular. COLOR. Head extensively yellow, frons centrally, interocellar area, vertex posteriorly, upper posterior of gena black, and antennae black; mesosoma predominantly yellow, pronotum centrally, mesoscutum with three longitudinal vittae, area bellow subalar prominence, mesosternum, metapleuron antero-ventrally, propodeum black; metasomal tergites I–VII black, tergites VIII–IX dark brown; wings hyaline. Male Unknown. Remarks Of all the Neotropical species, this is the only one that has some data about its biology: it was collected while visiting flowers of Eryngium guatemalense Hemsley (Apiaceae) . This represents the first record of the genus for Guatemala ( Fig. 11A ).