Horned Knobtail

In adult males, the head is dark brown, with a variety of pale grayish to greenish markings on the labrum, postclypeus, mandibles, and frons. The prothorax is dark brown with greenish-yellow sides and central back on the middle lobe. The pterothorax is dark brown with a number of grayish-green stripes. The abdomen is dark brown and has ten segments, with pale greenish-yellow stripes and spots on the first eight. Females are broadly similar to males in appearance, but with slight differences in coloration. Like other Costa Rican endemic Epigomphus, E. corniculatus females have a unique pair of postocellar "horns". In the holotype male, the abdominal length is 41.5 mm, the hind-wing length is 34 mm and the total length is 54 mm. In the allotype female, the abdominal length is 43 mm, the hind-wing length is 39 mm and the total length is 57 mm.

Endemic to Costa Rica, Epigomphus corniculatus is known from the province of Limón. It inhabits streams in lowland rainforests at elevations of around 60 m (200 ft). The species has a total range that is estimated to be less than 1,000 km². The species is classified as being endangered by the IUCN due to its small range, which has undergone extensive deforestation.

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