Colletes niger, n. sp. — ♀. Black, shining, with long erect jet black pubescence; clypeus prominent, with coarse close punctures tending to form striæ on either side of a shallow median longitudianl depression, and with a deep transverse depression just before the sharply truncate apex; face above and on sides of clypeus much more closely and finely punctured, and covered with a long and dense pubescence which extends over the clypeus itself; vertex and cheeks very finely punctured, the former practically bare except for a tuft of long hairs in the interocellular space, the latter with abundant long hairs; ocelli pale, opalescent; occiput fringed with long erect pubescence; malar space smooth, its length about, two-thirds width of mandible at base; mandibles slender and polished, deeply grooved without, notched almost at the tip, which is blunt and slightly rufescent in some lights; labrum with a rounded median pit at base; antennæ entirely glossy black, the first joint of the flagellum as long as the second and third together; no prothoracic spines; disc of mesothorax sparsely covered with erect hairs and with a few fine punctures, the pubescence becoming longer and denser and the punctuation finer and much closer on the sides, especially anteriorly;