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Osmia atriventris Cresson, 1864
Osmia (Nothosmia) atriventris Cresson, 1864; Osmia (Chenosmia) atriventris Cresson, 1864; Osmia parva_homonym Provancher, 1883; Osmia parvula_homonym Dalla Torre, 1896, replacement name; Osmia nigritula Friese, 1902, replacement name; Osmia (Nothosmia) nigritula Friese, 1902; Osmia (Melanosmia) nigritula Friese, 1902

Life   Insecta   Hymenoptera   Apoidea   Megachilidae   Osmia
Subgenus: Melanosmia

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Osmia atriventris MALE mm x f
© Copyright Laurence Packer 2014 · 7
Osmia atriventris MALE mm x f
Osmia atriventris, f, back, beltsville, md ---.. ZS PMax
© Copyright source/photographer · 5
Osmia atriventris, f, back, beltsville, md ---.. ZS PMax

Osmia atriventris, F, side, beltsville, md ---.. ZS PMax
© Copyright source/photographer · 5
Osmia atriventris, F, side, beltsville, md ---.. ZS PMax
Osmia atriventris, F, Back, MD, Washington County ---.. ZS PMax
© Copyright source/photographer · 5
Osmia atriventris, F, Back, MD, Washington County ---.. ZS PMax

Osmia atriventris, F, Face, MD, Washington County ---.. ZS PMax
© Copyright source/photographer · 5
Osmia atriventris, F, Face, MD, Washington County ---.. ZS PMax
Osmia atriventris, F, Side, MD, Washington County ---.. ZS PMax
© Copyright source/photographer · 5
Osmia atriventris, F, Side, MD, Washington County ---.. ZS PMax

Osmia atriventris, m, sternites, Denny Johnson
© Copyright source/photographer · 5
Osmia atriventris, m, sternites, Denny Johnson
Osmia atriventris F 071915, diverging mandible ridges
Deana Crumbling · 1
Osmia atriventris F 071915, diverging mandible ridges

Osmia atriventris M 171270, propodeal pit
Deana Crumbling · 1
Osmia atriventris M 171270, propodeal pit
Osmia atriventris M 171270, propodeal pit alt view
Deana Crumbling · 1
Osmia atriventris M 171270, propodeal pit alt view

Osmia atriventris, female, hypostomal cavity carina
Ellen Bulger · 1
Osmia atriventris, female, hypostomal cavity carina
Osmia atriventris, female, hypostomal cavity carina
Tracy Zarrillo · 1
Osmia atriventris, female, hypostomal cavity carina

Osmia atriventris, Male 155923 parapsidal lines
Deana Crumbling · 1
Osmia atriventris, Male 155923 parapsidal lines
Osmia atriventris, Male 155923 S2 covering S3
Deana Crumbling · 1
Osmia atriventris, Male 155923 S2 covering S3
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 8 mm.; blue-green; face very slightly longer than distance between eyes above; eyes slightly convergent below; lateral ocelli subequally distant from margin of vertex and each other, slightly more distant from eyes; clypeus rather strongly convex, considerably produced apically, median area of margin nearly straight, narrowly impunctate and somewhat shining; median length of labrum approximately equal to basal width; mandibles 3-dentate, as shown (fig. 32); cheeks considerably broader than eyes; wings very lightly infuscated, 2nd recurrent vein reaching 2nd submarginal cell much nearer apex than 1st does to base; tarsal segments simple and unmodified, mid and hind spurs piceous; scopa black, pubescence otherwise largely pale, thin but rather elongate on face, cheeks below, dorsum of thorax, pleura and basal abdominal tergum, very thin, rather short and inconspicuous on terga 2-5, short, thin and subappressed, but not hiding surface on 6; punctures deep and distinct, quite close and coarse in general, slightly separated on each side of vertex, but otherwise nearly or quite contiguous over entire head; punctures quite coarse over most of scutum and scutellum, slightly separated in center of scutum posteriorly and on midline of scutellum; pleura dull, punctures shallow but contiguous; lateral faces of propodeum rather dull, very finely roughened or subreticulate, posterior face dull, densely tessellate, with scattered, obscure punctures, dorsal area velvety, becoming narrowly striate along upper margin; abdominal terga shining, punctures rather fine and distinctly separated, somewhat closer toward base, but becoming well separated toward apical margin of each plate, becoming quite close at each extreme side, apical margins only very slightly depressed, this area invaded by fine, scattered punctures which do not reach the apical rims.

MALE Length 7-8 mm.; dark bluish- green; face considerably longer than distance between eyes above; eyes somewhat convergent below; lateral ocelli slightly nearer margin of vertex than to each other, slightly more distant from eyes; clypeus rather strongly convex, somewhat produced apically, median area of margin nearly straight, vaguely crenulate, narrowly shining and impunctate; median length of labrum approximately equal to basal width; mandibles bidentate; cheeks about equal to eyes in width; wings subhyaline, recurrent veins reaching 2nd submarginal cell rather distant from base and apex, these spaces about equal; tarsal segments of legs slender and simple, unmodified, hind basitarsus with a very low, anterior tubercle near apical third, mid and hind spurs brownish or piceous; pubescence entirely pale, rather copious but thin over most of head and thorax, quite elongate on thorax dorsally and laterally, very thin and inconspicuous on abdominal terga; punctures deep and distinct, rather coarse and quite close in general, close but distinct on cheeks, vertex and upper part of face, becoming densely crowded and very fine on clypeus; scutum and scutellum shining, punctures distinct but not crowded, scutellum with a median, narrow, impunctate line; pleura dull, punctures shallow but contiguous, almost crowded; lateral faces of propodeum smooth but rather dull, punctures vague and indefinite, posterior face more densely tessellate, with closer but obscure punctures, dorsal area dull and velvety, becoming narrowly striate along upper margin; abdominal terga more shining, median punctures rather fine and slightly separated, becoming slightly closer toward sides, rather uniformly distributed on 4 and 5, 6 rather closely and shallowly punctate across base, but punctures becoming fine, sparse and indefinite apically, margins of terga shallowly but rather broadly depressed, invaded by fine punctures which do not attain apical rims; tergum 6 with a small, median, semicircular emargination, 7 narrowly produced medially, with a deep, semicircular emargination; sternum 2 broadly rounded apically, margin yellowish-hyaline, covering in large part sterna 3 and 4, 3 with a narrow, median, triangular emargination which is entirely filled with elongate, converging setae (fig. 33); 4 somewhat produced apically across median third, this area quite densely setose, 5-8 entirely retracted, 6 with a rounded, median, apical lobe; genital armature as shown (fig. 35).

DISTRIBUTION Alberta to Nova Scotia, south to Iowa, Tennessee and Georgia, April to July.

FLOWER RECORDS Barbarea, Cercis, Chrysanthemum, Geranium, Hydrangea, Rubus, Trifolium, Vaccinium, Vicia and Viola. This is recorded by Robertson (1929) on Arabis, Astragalus, Cardamine, Claytonia, Collinsia, Ellisia, Erigenia, Fragaria, Gillenia, Hypozis, Lithospermum, Mertensia, Nothoscordum, Pentstemon, Polymoniurn, Psoralea, Uvularia and Zizia.


Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
A. newhart  623 @ JRYB__SHEN (4)
Berberidaceae  Berberis thunbergii @ AMNH_BEE (1)
Boraginaceae  Phacelia dubia @ UCRC_ENT (2)
Brassicaceae  Brassica sp @ BBSL (1)
Elaeagnaceae  Elaeagnus umbellata @ AMNH_BEE (1)
Ericaceae  Vaccinium @ CUIC_ENT (7)
Fabaceae  Lotus corniculatus @ UCMS_ENT (1)

Tephrosia virginiana @ AMNH_BEE (1)

Trifolium hybridum @ CUIC_ENT (2)

Trifolium @ UCRC_ENT (2)

Vicia sp @ BBSL (1)
Geraniaceae  Geranium maculatum @ UCRC_ENT (1)
J. rykken  1049 @ JRYB__SHEN (1)

575 @ JRYB__SHEN (1)

808 @ JRYB__SHEN (3)

983 @ JRYB__SHEN (4)
Lythraceae  Lythrum alatum @ AMNH_BEE (1)
Plantaginaceae  Nuttallanthus canadensis @ LACM_ENTB (1)

Veronica officinalis @ AMNH_BEE (1)
Rosaceae  Porteranthus trifoliatus @ UCRC_ENT (3)

Prunus americana @ AMNH_BEE (1)

Prunus persica @ UCRC_ENT (2)

Rubus flagellaris @ AMNH_BEE (1)

Rubus sp @ BBSL (1); BBSL__BBSLID (2)

Rubus @ CUIC_ENT (4); LACM_ENTB (7)
Salicaceae  Salix humilis @ AMNH_BEE (1)

Salix @ AMNH_BEE (7)
Violaceae  Viola sp @ BBSL__BBSLID (2)
_  Withheld @ BBSL (3)

blueberry @ NLA (4)

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Updated: 2018-04-23 16:16:49 gmt
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