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Type material. Ecuador: Holotype (♂, USNM): Ecuador, Past. Mera: 1300 m xii. 1992 V.O. Becker Col; Col. Becker 100503, (1♂). Paratypes (4♂), USNM. Ecuador, Past. Mera: 1300 m xii. 1992 V.O. Becker Col, Col. Becker 100503, (♂); Ibidem, 100504, (1♂); Ecuador, Past. Puyo: (22 km W) 5 February 1976 Blacklite [sic] Spangler, et al., Ecuador, Peace Corps. Smithsonian Institution Aquatic Insect Survey, Genitalic slide by DA ♂108,095, (1♂); (27 km N) Est. Fluv. Metrica 4 February 1976 Spangler, et al. (1♂).
Habitus, male genitalia (Figs 3, 42). This species is most readily diagnosed by the darkly shaded forewings and by the male genitalia, which have the following features in common with medalba: anterior margin of tegumen deeply invaginate, outer margin of valva entire, intra-saccular process naked.
(Fig. 3). Forewing length: 7.5–8.0mm (n=5). Head - Ocelli absent; proboscis reduced; frons conical; labial and maxillary palpi straight, not extending beyond clypeus. Thorax - Female with one pair of hind tibial spurs (medial pair absent). Forewing. Shaded gray brown, hind wings dark gray brown; postmedial line, when evident, characteristic of genus, outwardly bulged towards costa, sinuous towards inner margin, but entire forewing more darkly shaded than in other species. Medial area partially suffused with white in some but not all specimens. Subterminal line pale, unbroken; fringe gray. Hindwing. Uniformly brown gray; subterminal line pale tawny, unbroken; fringe gray. Abdomen - Uniformly covered in gray-brown scales. Tympanal organs. (Fig. 23). As for medalba group, vide supra. Male genitalia (Figs 42, 43) - Teguminal sulcus short, such that anterior margin of tegumen appears deeply invaginate; juxta a U-shaped plate; valvae simple, reduced, rounded, not bilobed or emarginate; intrasaccular process a simple flange, naked; phallus simple, cornuti absent. Female genitalia (Fig. 44) - Unknown.
Markings may be obscured in some specimens, rendering them more or less uniformly gray brown.
The specific epithet refers to the dark wing shading of this species and is treated as a noun in apposition.
- Goldstein, P; Metz, M; Solis, M; 2013: Phylogenetic systematics of Schacontia Dyar with descriptions of eight new species (Lepidoptera, Crambidae) ZooKeys, 291: 27-81. doi