_Male._ Tawny; head with a black spot on the vertex, and with two black dots on each side, one in front, the other behind; antennæ black towards the base; arista white; thorax with a black spot on each side in front; legs black; coxæ and femora luteous, with black tips; wings grey, tinged with yellow; veins black; cubital vein and præbrachial vein converging towards the tip of the wing; discal transverse vein straight, oblique, parted by less than its length from the border, and by more than twice its length from the præbrachial transverse; halteres with black knobs. Length of the body 3-1/2 lines; of the wings 5-1/2 lines. Gen. NERIUS, _Wied._ 215. Nerius fuscipennis, _Macq._ See Vol. I. p. 38. Gen. SERACA, n. g. _Foem. Corpus_ longiusculum. _Caput_ transversum, thorace vix angustius. Antennæ breves, articulo 3° conico, arista plumosa. _Thorax_ ellipticus. _Abdomen_ ellipticum. _Pedes_ mediocres. _Alæ_ longiusculæ, latiusculæ. _Female._ Body rather long. Head transverse, nearly as broad as the thorax; epistoma not prominent. Antennæ short, not near reaching the epistoma; 3rd joint conical, much longer than the 2nd; arista plumose. Thorax and abdomen elliptical, about equal in length. Legs moderately long and slender. Wings rather long and broad. 216. SERACA SIGNIFERA, n. s. _Foem._ Fulva, thorace vittis quatuor metathorace vittis duabus abdomine maculis lateralibus nigris, alis obscure fuscis albo quinquesignatis apud costam nigricantibus basi flavis. _Female._ Tawny, shining; head testaceous about the eyes; thorax with four black stripes, the outer pair incomplete; metathorax with two black stripes; abdomen with a row of black spots along each side; wings dark brown, blackish along the costa, yellow at the base, with five lanceolate white marks, two of these resting on the costa, the third between them near the hind border, the fourth exterior, discal, slender, oblique, the fifth on the hind border near the tip; veins black, tawny at the base; discal transverse vein curved outward, parted by about one-fourth of its length from the border, and by much more than its length from the præbrachial transverse. Length of the body 4 lines; of the wings 8 lines. 217. SERACA SIGNATA, n. s. _Foem._ Testacea, longiuscula, epistomate guttis duabus nigris, arista plumosa, abdomine postice attenuato maculis duabus lateralibus subapicalibus, alis cincrascentibus, costa exteriore nigricante.