NEW NORTH AMERICAN BEES OF THE GENUS ANDRENA, By Henry L. Viereck and T. D. A. Cockerelt.. The genus Andrena is richly represented in Europe, Asia, northern Africa, and North America, the species differing greatly in size and appearance and ha\dng diverse flower-visiting habits. Although very many species have been described, it is evident that many more remain to be discovered. The present paper makes known a series, chiefly from the Rocky Mountain Region. •o'. Species with only tv/o submarginal cells. d^. Female with yellow face-marks ; stigma small. ANDRENA VERBESINAE, new species. Cotulla, Texas. May 12, 1906, (F. C. Pratt), on Verbesina ence-lioides. Female. — Length, 11 mm. Robust. Black; all the tarsi and the anterior and middle tibiae ferruginous, A mark occupying most of clypeus, its lower end trilobed, and very large semicircular lateral marks light yellow. Facial quadrangle a very little broader than long. Process of labrum shghtly emarginate. Clypeus shining, well punctured, flattened in middle, with a smooth band; facial foveas seen from above light ochreous, occupying a little more than half distance between eye and antenna,^ below rapidly narrowing, > A number of years ago Mr. Viereck began a revision of the genus Andrena as found in North America, and at different times published part of his results, chiefly in the form of tables. The tables for the sepa-ration of the groups and species are nearly completed, but the completion of the whole work is unavoidably delayed. It has therefore seemed advisable to publish descriptions of a number of new species, principally from the Rocky Mountains. These species were all recognized as new and given names by Mr. Viereck, and in working over them I have used Mr. Viereck's tables, giving the characters separating them from species previously described as well as from numerous species not yet published. It has been impossible to credit specifically the matter derived from Mr. Viereck's manuscript, but it will be understood that v/hile I am alone responsible for the form of the present paper, it is based upon ^r. Viereck's work and is in every sense a product of our joint labors. All the species which Mr. Viereck regarded as distinct are separately described, although several appear to me to be varietal forms only and are here given as such. Mr. Viereck, on going over the manuscript, writes that he will provisionally accept my opinions on these matters, being at present unable to reinvestigate the questions involved. It is hoped that the account given is sufficiently full to enable students to determine all the forms, whether regarded as varieties or distinct species. The "key" referred to in this paper is that in Mr. Viereck's manuscript. The comments within brackets are mine alone.— T. D. A. Cockerell. 2 This refers, strictly speaking, to the distance between eye and vertical line running through outer edge of anteimal socket; hence not necessarily to the breadth of the fovea at transverse level of antenna. Proceedings U. S. National Museum, Vol. 48— No. 2064. 59758°— Proc.N.M.vo1.48— 14 1 1
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