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Osmia bucephala Cresson, 1864 Osmia megacephala Cresson, 1864; Osmia latitarsis Cresson, 1864; Osmia lignivora Packard, 1867; Osmia lignicola Provancher, 1882; Osmia subornata Cockerell, 1897; Centrosmia bucephala (Cresson, 1864); Osmia (Centrosmia) bucephala Cresson, 1864
Life
Insecta
Hymenoptera
Apoidea
Megachilidae
Osmia
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Reprinted with permission from: Mitchell, T.B. 1962 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 152. | FEMALE Length 15-16 mm.; black, with bluish reflections; length of face to anterior ocellus equal to distance between eyes; eyes subparallel; lateral ocelli much nearer each other than to eyes, and slightly nearer eyes than to margin of vertex; clypeus quite strongly convex, apical margin considerably produced and very strongly thickened, strongly depressed just above this area; labrum subquadrate, only very slightly longer than basal width; mandibles 3-dentate, as shown (fig. 32); width of cheeks about twice that of eyes; wings lightly infuscated, 2nd recurrent vein reaching 2nd submarginal cell considerably nearer apex than 1st does to base; tarsal segments quite short, simple and unmodified, mid and hind spurs piceous; pubescence yellowish-white around antennae, on vertex, dorsum of thorax and in large part on abdominal terga 1 and 2, elsewhere, including the scopa, black; punctures in general, fine and rather close, slightly separated on each side of clypeus, around ocelli and over most of cheeks, quite dense on supraclypeal area, clypeus medially, sides of face, and vertex medially; punctures slightly separated in center of scutum, otherwise close over dorsum of thorax and on pleura, propodeum smooth but rather dull, punctures hardly evident, dorsal area velvety, upper margin not definitely striate or rugose; punctures of abdominal terga minute and rather close but not crowded on terga 1 and 2, becoming closer on the following terga, apical margins somewhat depressed, but these areas to some degree punctate, punctures becoming more sparse and minute toward the rims; abdominal terga densely and copiously pubescent, this yellowish on 1 and 2, but apex of 2 becoming blackish, and black and erect on 3-5, more or less appressed but still quite dense on 6. MALE Length 13-14 mm.; head and thorax largely black, but with vague bluish reflections above, abdomen more definitely bluish; face considerably longer than distance between eyes; eyes subparallel, lateral ocelli somewhat nearer each other than to eyes, and slightly nearer eyes than to margin of vertex; clypeus rather broadly convex, apical margin considerably produced, median area nearly straight but with vague crenulations; labrum short, much broader than the medianlength; mandibles bidentate; cheeks only slightly broader than eyes; wings subhyaline, 2nd recurrent vein reaching 2nd submarginal cell much nearer apex than 1st does to base; mid tarsal segments much modified, the basitarsus produced apically on inner side, segments 2-4 very broadly dilated apically and strongly thickened, hind basitarsus slender at base and quite broadly dilated toward apex, not tuberculate, mid and hind spurs black, the inner hind spur nearly as long as the basitarsus and strongly curved; pubescence whitish over most of head and thorax, rather dense on front of face, clypeus and lower cheeks, on pleura and around margin of dorsum of thorax, white on basal portions of legs, becoming more or less blackish on tarsal segments; pubescence whitish on terga 1 and 2, black and erect on discs of 3-5, pale with intermixed, blackish hairs on 6; punctures fine and close in general, somewhat separated on each side of vertex above eyes, otherwise quite densely crowded over most of head, close over most of scutum and scutellum, but slightly separated medially on scutum posteriorly and over much of scutellum; punctures very fine and densely crowded on pleura, lateral faces of propodeum smooth and somewhat shining, with vague, minute punctures, posterior face becoming rather dull, without distinct punctures, dorsal area velvety; punctures minute and slightly separated on abdominal terga 1-4 medially, becoming very close and minute laterally, somewhat more uniformly distributed on 5, and becoming minute and rather widely separated on 6, apical margins rather broadly depressed and impunctate on all terga, 6 without a distinct, median emargination, 7 very broad and very shallowly emarginate; sternum 2 broadly subtriangular apically, only partially covering sternum 3, this with a rather narrow, median emarginate area which is largely occupied by convergent setae; sternum 4 rather broadly rounded apically, with a median area beset with elongate, black setae, bare on each side, 5-8 entirely retracted, apicalmargin of 6 with a rather narrow, median, truncate lobe, 8 produced medially into an elongate, slender, pubescent process; genital armature as shown (fig. 27). DISTRIBUTION British Columbia and the Yukon to the New England states, south to Georgia, April to July. FLOWER RECORDS Azaleas and Pentstemon. Robertson (1929) records bucephcila on Aesculus, Baptisia, Cercis, Dentaria, Dicentra, Erythronium, Mertensia and Viola. A subspecies from the Northwest, subornata Cockerell, makes the subapecific designation of bucephalci necessary.
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