Halictus ceratinus

1. Halictus ceratinus. H. niger; alis hyalinis; abdomine clavato. Male. Length 31/2 lines. Black: the head closely and finely punctured; antennae as long as the thorax, the flagellum obscurely testaceous beneath; the face covered with griseous pubescence; the mandibles ferruginous at their apex. Thorax closely punctured; the wings hyaline and iridescent, their apex slightly clouded; the nervures and tegulae testaceous; the legs rufo-testaceous, the tarsi paler, and covered with pale glittering pubescence. Abdomen clavate; the apical margins of the segments with fasciae of short white pubescence, frequently more or less obliterated; shining and delicately punctured; beneath, the apex of the third segment, and the fourth, entirely clothed with very short whitish pubescence; the abdomen is of a dark rufo-testaceous hue, palest beneath, varying in different individuals. Hab. Borneo (Sarawak). This remarkable form of Halictus occurs at Sierra Leone. I have described a species from that locality, the " H. clavatus;" it is a smaller and very distinct species from H. ceratinus; in this species the first recurrent nervure is received in the middle of the second submarginal cell.
Published as part of Smith, F., 1857, Catalogue of the hymenopterous insects collected at Sarawak, Borneo; Mount Ophir, Malacca; and at Singapore, by A. R. Wallace., pp. 42-88 in Journal of the Proceedings of the Linnean Society of London, Zoology 2 on page 42