This genus may be distinguished from Culcua by the shape of the abdomen.
17. Nerua scenopinoïdes, n. s. Fœm. Atra, nitens, antennis fulvis, scutelli spinis pedibusque albis, alis nigro-cinereis, postice pallidioribus, venis nigris, halteribus testaceis.
Female. Coal-black, shining; antennæ tawny; thorax slightly tomentose; spines of the scutellum and legs white; wings blackish grey, paler towards the hind border, veins black; halteres testaceous. Length of the body 3 lines; of the wings 5 lines.
Gen. Adraga, n. g.
Mas. Corpus sublineare. Caput thorace non latius. Oculi connexi. Antennæ brevissimæ; articulus tertius rotundus; arista apicalis, gracilis, setiformis. Thorax sutura transversa bene determinata. Scutellum prominens, trigonum, marginatum. Abdomen thorace paullo brevius, non latius. Pedes breviusculi, validi, non dilatati. Alæ mediocres.
Male. Body nearly linear, rather thick. Head not broader than the thorax. Eyes connected. Antennæ very short; third joint round; arista apical, long, slender, setiform. Thorax with the transverse suture very distinct. Scutellum prominent, triangular, with a border. Abdomen a little shorter and not broader than the thorax. Legs stout, rather short, not dilated. Wings moderately broad; veins in structure like those of Clitellaria.
18. Adraga univitta, n. s. Mas. Nigra, subtilissime punctata, antennis piceis, thorace vitta cinerea, tarsis posterioribus albis, alis nigricantibus.
Male. Coal-black, hardly shining; antennæ piceous; thorax and abdomen very minutely punctured; thorax with a stripe of cinereous tomentum; posterior tarsi white; wings blackish, veins black. Length of the body 3 lines; of the wings 5 lines.
Gen. Obrapa, n. g.
Fœm. Corpus breve, latum, crassum, convexum. Caput transversum, thorace angustius. Antennæ breves; articulus tertius rotundus; arista apicalis, gracilis, setiformis. Thorax sutura transversa bene determinata. Abdomen transversum, thorace paullo latius, valde brevius. Pedes breviusculi, validi; antici subdilatati. Alæ mediocres.