Seticornuta nigroflava, Alvarado, 2022

Alvarado, Mabel, 2022, Darwin wasps of the genus Seticornuta Morley, 1913 (Ichneumonidae: Metopiinae) in the Neotropical region, with a key to species, European Journal of Taxonomy 839, pp. 149-175 : 167-168

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Seticornuta nigroflava

sp. nov.

Seticornuta nigroflava sp. nov.

Figs 7 View Fig , 10D View Fig , 11A View Fig


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.


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.

Material examined


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. GoogleMaps



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.




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 View Fig ).


University of Kansas - Biodiversity Institute