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Osmia lignaria Say, 1837 Osmia purpurascens Smith, 1849; Ceratosmia lignaria (Say, 1837); Osmia propinqua Cresson, 1864; Osmia lignaria lignariella Cockerell, 1906; Osmia (Osmia) lignaria propinqua Cresson, 1864, valid subspecies
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 10-11 mm.; dark blue, becoming greenish on vertex, dorsum of thorax and abdominal terga; face only slightly longer than distance between eyes above; eyes subparallel; lateral ocelli somewhat nearer each other than to eyes, and nearer eyes than margin of vertex; apical margin of clypeus somewhat produced, with a broad and deep, subquadrangular, median emargination (fig. 30); median length of labrum somewhat greater than basal width, slightly narrowed and truncate apically, with a sub-basal, transverse brush of hairs; mandibles rather slender and elongate, bi-dentate apically, with a small, inconspicuous, submedian tooth (fig. 32); width of cheeks nearly twice that of eyes; wings very lightly infuscated, 2nd recurrent vein reaching 2nd submarginal cell only slightly nearer apex than 1st does to base; tarsal segments simple and unmodified; front spurs brownish-hyaline, mid and hind spurs piceous; pubescence, including scopa, largely black, but pale with intermixed, rather long and erect fuscous hairs around antennae and on dorsum of thorax, entirely pale on basal abdominal tergum and on tergum 2 except apical margin; punctures deep and distinct in general, fine and quite close over most of head and on dorsum of thorax, becoming somewhat more widely separated but still quite close on scutum posteriorly and on scutellum, pleura and propodeum dull, punctures fine and almost crowded; punctures somewhat finer on abdominal terga medially, distinctly but not widely separated, becoming very fine toward sides, and uniformly close on tergum 5, densely crowded and minute on 6. DISTRIBUTION: British Columbia to Quebec and the New England states, south to California, Oklahoma and Georgia, March to June. FLOWER RECORDS: Cercis, Fragaria, Geranium, Lupinus, Malus, Prunus, Rubus, Salix, Taraxacum, Vicia and Viola. Robertson (1929) records lignaria also on Camassia, Cardamine, Chaerophyllurn, Claytonia, Collinsia, Dentaria, Dicentra, Direa, Erigenia, Erythronium, Hydrophyllum, Mertensia, Osmorrhiza, Oxalis, Polymoniurn, Pyrus, Ranunculus, Ribes, Stellaria, Taenidia, Viburnum and Zanthoxylurn. The subspecific designation of lignaria is made necessary by the recognition of another subspecies, propinqua Cresson, that is found in the West.
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