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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
Subgenus: Melanosmia

Osmia bucephala, -female, -side 2012-06-08-14.46.41
© Copyright source/photographer · 9
Osmia bucephala, -female, -side 2012-06-08-14.46.41

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Osmia bucephala, Mid-Atlantic Phenology
© Copyright source/photographer · 9
Osmia bucephala, Mid-Atlantic Phenology
Osmia bucephala, abdomen, scopal hairs tapered, bucephala
David Cappaert · 9
Osmia bucephala, abdomen, scopal hairs tapered, bucephala

Osmia bucephala, head, clypeus depression, bucephala
© Copyright source/photographer · 9
Osmia bucephala, head, clypeus depression, bucephala
Osmia bucephala, female, head, vertex x, bucephala
David Cappaert · 9
Osmia bucephala, female, head, vertex x, bucephala

Osmia bucephala, head, vertex vs frons pits, bucephala
David Cappaert · 9
Osmia bucephala, head, vertex vs frons pits, bucephala
Osmia bucephala FEM
© Copyright Laurence Packer 2014 · 7
Osmia bucephala FEM

Osmia bucephala MALE comp
© Copyright Laurence Packer 2014 · 7
Osmia bucephala MALE comp
Osmia bucephala, Thomas of Baltimore
Thomas of Baltimore · 5
Osmia bucephala, Thomas of Baltimore

Osmia bucephala, m, sternites, Denny Johnson
Denny Johnson · 5
Osmia bucephala, m, sternites, Denny Johnson
Osmia bucephala, Bufflehead Mason Bee
© Copyright John Ascher, 2006-2014 · 4
Osmia bucephala, Bufflehead Mason Bee

Osmia bucephala, Bufflehead Mason Bee
© Copyright John Ascher, 2006-2014 · 4
Osmia bucephala, Bufflehead Mason Bee
Osmia bucephala, Bufflehead Mason Bee
© Copyright John Ascher, 2006-2014 · 4
Osmia bucephala, Bufflehead Mason Bee

Osmia bucephala, Bufflehead Mason Bee
© Copyright John Ascher, 2006-2014 · 4
Osmia bucephala, Bufflehead Mason Bee
Osmia bucephala, Bufflehead Osmia
© Copyright John Ascher, 2006-2014 · 2
Osmia bucephala, Bufflehead Osmia
Overview
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.

Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
A. newhart  623 @ JRYB__SHEN (2)
Asclepiadaceae  Asclepias sp @ BBSL__BBSLID (1)
Asteraceae  Antennaria sp @ BBSL (1)

Balsamorhiza sp @ BBSL (3)

Cirsium sp @ BBSL__BBSLID (1)

Packera sp @ BBSL__BBSLID (1)

Taraxacum officinale @ BBSL__BBSLID (7)

Taraxacum sp @ BBSL__BBSLID (1)
Boraginaceae  Mertensia ciliata @ BBSL__BBSLID (1); BBSL (1)

Mertensia paniculata @ BBSL__UAM (1)

Mertensia virginica @ LACM_ENTB (1)

Mertensia @ AMNH_BEE (1)

Phacelia distans @ LACM_ENTB (1)
Brassicaceae  Erysimum wheeleri @ BBSL (3)
C. smith  672 @ JRYB__SHEN (1)
Caprifoliaceae  Lonicera involucrata @ BBSL (5); DART_ENT (1)
Clusiaceae  Hypericum perforatum @ BBSL (1)
Cornaceae  Cornus @ AMNH_BEE (1)
Ericaceae  Arctostaphylos uva-ursi @ BBSL__BBSLID (1)

Kalmia polifolia @ BBSL (1)

Rhododendron @ AMNH_BEE (7)
Euphorbiaceae  Euphorbia esula @ BBSL__BBSLID (1)
Fabaceae  Astragalus miser @ BBSL (1)

Astragalus sp @ BBSL__BBSLID (1)

Baptisia sp @ BBSL (1)

Hedysarum alpinum @ BBSL__UAM (1)

Hedysarum boreale @ BBSL (20); BBSL__UAM (17)

Lathyrus lanszwertii @ LACM_ENTB (4)

Lathyrus leucanthus @ BBSL__BBSLID (1); RMBL_ENT (1)

Lupinus argenteus @ BBSL__BBSLID (6)

Lupinus sp @ BBSL__BBSLID (4)

Melilotus officinalis @ BBSL__BBSLID (1)

Oxytropis sericea @ BBSL__BBSLID (1)

Thermopsis divaricarpa @ BBSL__BBSLID (1)

Thermopsis montana @ BBSL (1)

Thermopsis rhombifolia @ AMNH_BEE (1)

Thermopsis sp @ BBSL__BBSLID (16)

Trifolium @ AMNH_BEE (1)

Vicia americana @ RMBL_ENT (1)

Vicia praemorsa @ DART_ENT (1)
Geraniaceae  Geranium @ CUIC_ENT (1)
J. rykken  1031 @ JRYB__SHEN (1)

1096 @ JRYB__SHEN (1)

623 @ JRYB__SHEN (1)

672 @ JRYB__SHEN (1)

746 @ JRYB__SHEN (2)

814 @ JRYB__SHEN (1)

983 @ JRYB__SHEN (2)
Lamiaceae  Glechoma sp @ BBSL__BBSLID (1)
Liliaceae  Erythronium sp @ BBSL__BBSLID (1)
Linaceae  Linum lewisii @ DART_ENT (1); RMBL_ENT (2)
Oleaceae  Syringa sp @ BBSL__BBSLID (1)
Onagraceae  Epilobium angustifolium @ BBSL__BBSLID (1); RMBL_ENT (1)

Epilobium sp @ BBSL__BBSLID (1)
Orobanchaceae  Pedicularis @ AMNH_BEE (1)
Plantaginaceae  Penstemon @ AMNH_BEE (1); UCRC_ENT (1)
Rosaceae  Geum triflorum @ RMBL_ENT (1)

Physocarpus malvaceus @ BBSL (2)

Potentilla sp @ BBSL (1)

Prunus melanocarpa @ BBSL__BBSLID (1)

Rosa sp @ BBSL__BBSLID (1)

Rubus ursinus @ BBSL__BBSLID (2)
Scrophulariaceae  Penstemon cyananthus @ BBSL (1)

Penstemon sp @ BBSL__BBSLID (1)
Violaceae  Viola nuttallii @ RMBL_ENT (2)
_  Withheld @ BBSL (29)

blueberry @ NLA (2)

pond edge @ NLA (3)

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Following served from Paul McNelis, BugGuide, bugguide.net
   
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