Thymaris Slingerlandana new species—♀. Length, 4.5mm.; ovipositor about one-third the length of the abdomen. Black, subopaue, the head and thorax very finely, microscopically punctate, with a sparse, glittering, white pubescence, which is dense or more distinct on the lower part of the face, the cheeks, the pleura and the metanotum; ocelli pale or opalescent; palpi whitish; scape and pedicel of antennæ the tegulæ, the front and middle coxæ and tronchanters, the hind trochangters except at base of first joint, and all tarsi, except as hereafter noted, honey-yellow, the hind coxæ, base of hind trochanters, a spot at base of hind tibiæ outwardly and at apex, and the apices of hind tarsl joints 1, 2 and 3 and joints 4 and 5 entirely, black; rest of legs pale ferruginous; wings hyalime, iridescent, the stigma and veins light brown, metathorax incompletely areloated, the areola alone complete or distinct pentagonal; abdomen subfusiform longly petiolated, about one-half longer than the thorax, subcompressed towards apex and entirely black, except the ventral fold, at apex of the petiole and on segments 2 and 3, which in honey-yellow.