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♂. Length, 8.5–10 mm.; of anterior wings, about 6–7 mm. Black with bright yellow markings. Head nearly quadrate, a little wider than high, closely and finely punctate. Eyes entire, elongate oval, inner margins parallel, inclined to light olive green. Ocelli in a triangle, the first a little larger than the last two, and located at the base of a slight cavity. A small cavity back and on the outer side of each of hind ocelli. Head covered with a sparse growth of long whitish pubescence, becoming thicker on face and back of eyes. Clypeus yellow and rounded, with two distinct lobes, each just inside of an imaginary line drawn straight down from base of antennæ, also a small but less distinct lobe between these two, very slightly blackened between, and including lobes. Mandibles yellow outwardly, rufous tipped.

Andrena Hallii, n.sp.♀—Length, 14–17 mm. Black, shining; pubescence black with patch on vertex, the prothorax, mesothorax (excepting posteriorly whre pubescence is not so thick and has black mixed with ferruginous, forming a more or less distinct black-appearing band between the tegulæ), scutellum and postscutellum bright ferruginous, thick, entirely obscuring punctures on thorax. Clypeus shining, large quite close punctures, a median line impunctured; antennæ black, third joint equal to fourth and fifth combined; metathorax not shining, closely and more finely punctured; scutellum with two smooth shining spots anteriorly, a few scattered punctures near-by otherwise roughened; postscutellum and metathorax roughened, enclosure triangular, distinctly outlined, carried to a point on posterior face, sometimes faintly and irregularly wrinkled in fore half, last half impunctured. Abdomen without hair bands, a few long scattered hairs on segments 3–4, 5th seg. pubescent and protuberant as is vicina; anal fimbria heavy, black; segments 1-4 depressed posteriorly, the first very slightly if at all, the remainder one-third or one-half of their length; fine scattered punctures on seg. 1–3, remainder impunctured; a sweep of hairs below like vicina. Wings dusky throughout, a violaceous reflection, otherwise like vicina; stigma and nervures piceous or very dark brown. Claws bifid, rufous; spurs black. Basal process of labrum prominent, emarginate.

Protandrena Cockerelli, n. sp.—♀. Length, 12 mm.; shining black. Upper half of clypeus, lower portion of supraclypeal area, and part of side pieces, bright yellow, all forming a band across the face one-half broader than high, and of equal breadth throughout; knees yellow spotted. Head rounded, broader than high, and covered with a short growth of gray hair, longer on cheeks and thickest at bave of antennæ; lower haif of clypeus and two small dots near lower edge of band black, not deeply or closely punctured; antennæ black at base, becoming brown towards the tip; first joint of flagellum not quite as long as the second and third combined; mandibles black; vertex deeply but not very closely punctate.

In the Canadia Entomologist, 1899, p. 293, ff., Mr. Ashmead has divided, first Aphilanthops into Clypeadon, Patton, and Aphilanthops, Patton, and secondly Plilanthus into Epiphilanthus, Pseudanthophilus, Anthophilus, and Philanthus.

♀.—Length 9–11 mm.; not as stout as Cockerelli, Dun.; a few gray hairs on face and cheeks and on under side of thorax, hair bands on seg. 2–3–4, seg. 5–6 covered with hair growing rufous towards tip, legs and venter with sparse rather longer hairs; black except a T-shaped mark resting against upper edge of clypeus, spot on tegulæ, tubercles, and four anterior knees which are pale yellow. Head subquadrate, broader than high, venter witlr fairly deep, not close, punctures; clypeal and sub-ciypeal punctures larger and shallow, mandibles piceous; antennæ black at base, growing brownish towards tip, 1st jt. flagellum not as long as 2nd and 3rd combined. Mesothorax deeply and closely punctured; scutellum with large, coarse punctures; post-scutellum not smooth, shining; metathorax with a smooth, shining spot on upper lateral angles, closely and finely punctured, a narrow suture extending upwards. Abdomen finely and closely punctured; venter with large shallow punctures. Wings subhyaline, much darkened outwardly (very much more so than in Cockerelli); stigma and nervures ferruginous, a light spot before the stigma.