When, in the summer of i9o4, I visited the British Museum, one of my chief objects was to examine the types of the American species of Azzdrena described by F. Smith. These insects, described when comparatively little was known about American bees, had always been difficult to identify, and with a few exceptions the current identifications were open to more or less doubt. Some years ago, the Rev. F. D. Morice very kindly sent me a series of notes resulting from his examination of them, and

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... were published in the Canadian Entomologist, 9oI; but further investigation was clearly desirable. I did not publish my notes on tndrena along with my other remarks on the British Museum bees (2'rans. Mm. Ent. Sac., 9o5), because it was intended to include them in a lengthy paper which Mr. Viereck expected to publish in 9o5; but as this work (a review of all the known American 4ndrenae)is likely to be much delayed, I give them here. 3/[elilta americana (Smith). Cilissa americana, Smith, ?. Length 2 mm. or slightly over; facial fovee apparently very broad, but ill-defined and not hairy; process of labrum low and broadly rounded; clypeus with a longitudinal median ridge, the upper part of which is narrow and grooved, while the lower part is very broad, and shining; rest of clypeus dull, with rather close punctures; mandibles broad at apex, with a short inner tooth cheeks ordinary; mesothorax fairly shining, with quite close shallow punctures, which look as if caused by blows from a hammer; mesothorax and scutellum with a good deal of black hair, which, however, is not conspicuous, except perhaps at sides of scutellum; scutellum shining on disc, with definite punctures; postscutellum quite dull, with a curious subtesselate surface, and posteriorly with long hair; enclosure of metathorax triangular and illdefined, slightly wrinkled at base; tegule with a conspicuous ferruginous spot; stigma yellowish-ferruginous, small and lanceolate; second submarginal cell not far from square, equally broad above and below, receiving the recurrent nervure at its middle; third submarginal cell very long, narrowed more than half to marginal; middle femora reddish, sharply keeled beneath; hind trochanters without any curled floccus; hair on outer face of hind tibia rather long and coarse, but