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Osmia tersula Cockerell, 1912
Osmia (Chenosmia) tersula Cockerell, 1912

Life   Insecta   Hymenoptera   Apoidea   Megachilidae   Osmia
Subgenus: Melanosmia

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Osmia tersula MALE CFP
© Copyright Laurence Packer 2014 · 7
Osmia tersula MALE CFP
Osmia tersula, Barcode of LifeData Systems
Barcode of Life Data Systems · 1
Osmia tersula, Barcode of LifeData Systems

Osmia tersula, head
© Copyright Hannah Gaines 2009 · 1
Osmia tersula, head
Overview
Identification Overview: Female: wide, unpitted margins to the tergites should alert that you may have one of these species. Told from other wide margined species by the portion of T1 that faces the propodeum dulled by microscopic lines and reflecting little light, the two inner teach of the mandible clearly spaced wider than the two outer teeth and the hypostomal carinae with clear decreases in height prior to reaching the bend near the mandible.

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 9-10 mm.; dark blue, with greenish tints, legs blackish; face somewhat longer than distance between eyes above; eyes very slightly convergent below; lateral ocelli subequally distant from eyes, each other and margin of vertex; clypeus convex, considerably produced apically, median third of margin straight, narrowly shining and obscurely striate; median length of labrum about equal to basal width; mandibles not much broadened apically, with an apical and an inner tooth and an upper bevelled edge (resembling inermis, fig. 32); cheeks much broader than eyes; wings subhyaline basally, becoming faintly infuscated apically, 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; pubescence of head and thorax largely pale, rather long and copious, but cheeks below with a few dark hairs behind eyes; scopa largely black, but sometimes with intermixed pale hairs; basal abdominal tergum long white pubescent, discs of the following terga with thin and short, inconspicuous, erect hairs, entirely pale on 2 and 3, becoming somewhat more elongate and darker, especially at sides, on 4 and 5, 6 rather densely covered with short, subappressed, pale pubescence; punctures in general quite deep and distinct, close but not crowded on vertex and cheeks, becoming densely crowded below ocelli and over clypeus, crowded and rather fine on scutum laterally and anteriorly, becoming rather well separated in center of disc, scutellum distinctly and quite closely punctate in large part, but punctures becoming crowded around posterior and lateral margins; pleura shining, punctures rather shallow but close; lateral faces of propodeum rather smooth but dull or finely tessellate, posterior face becoming very obscurely punctate, dorsal area tessellate and dull but rather smooth, becoming very finely and obscurely striate along upper margin; abdominal terga shining, punctures fine and quite close across base of each disc, becoming rather widely separated toward the broad, depressed, apical margins which are entirely impunctate, punctures somewhat closer at extreme sides, tergum 6 finely and densely punctate.

MALE — Length 8 mm.; bluish-green, becoming somewhat more olive-green on upper portions of head and thorax; face only slightly longer than distance between eyes above; eyes slightly convergent below; lateral ocelli sub- equally distant from eyes and each other, somewhat nearer margin of vertex; clypeus slightly convex, considerably produced apically, the broad apical margin nearly straight, narrowly shining and impunctate; median length of labrum about equal to basal width; mandibles bidentate; cheeks subequal to eyes in width; wings subhyaline basally, becoming faintly infuscated apically and in region of marginal cell, 2nd recurrent vein reaching 2nd submarginal cell somewhat nearer apex than 1st does to base; tarsal segments slender and simple, anterior margin of hind basitarsus with a robust, triangular, median tubercle, mid and hind spurs piceous; pubescence of head, thorax and basal abdominal tergum copious and elongate, entirely yellowish-white, largely obscuring surface around antennae and on clypeus, that on terga 2-6 entirely pale, rather short but erect and quite copious, more elongate on 4-6 laterally; punctures in general deep and distinct, close but not crowded on vertex and cheeks, becoming densely crowded below ocelli, fine and dense on clypeus beneath dense pubescence; punctures very close on scutum laterally and anteriorly, becoming slightly separated in center of disc, close but distinct on scutellum, becoming crowded around posterior margin; pleura somewhat shining, but punctures close in large part, lateral faces of propodeum smooth but rather dull, posterior face more tessellate, punctures hardly evident, dorsal area dull and velvety, becoming very narrowly and obscurely substriate along upper margin; abdominal terga shining, punctures quite deep and distinct, uniformly close to margins of apical depressed areas which are quite broad and entirely impunctate; apical margin of tergum 6 with a shallow but distinct, median emargination, 7 rather broadly produced medially, with a semicircular, median emargination; sternum 2 broadly outcurved apically, covering sternum 3 and base of 4 in large part, apical margin of 3 broadly emarginate medially, fringed with setae which converge but do not meet medially; sternum 4 produced apically, median third straight, slightly thickened and densely setose (fig. 34), 5-8 entirely retracted, apical margin of 6 broadly produced medially; genital armature as shown (fig. 35).

DISTRIBUTION — Alaska to Hudson’s Bay and New Brunswick, south to Colorado, Wisconsin and Michigan, in June.

FLOWER RECORD — Rubus.


Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Asteraceae  Cirsium sp @ BBSL (1)

Taraxacum sp @ BBSL (1)
Brassicaceae  Arabis glabra @ BBSL (1)
Caprifoliaceae  Lonicera sp @ BBSL (1)
Ericaceae  Vaccinium sp @ BBSL (1)
Fabaceae  Hedysarum boreale @ BBSL (2)
Violaceae  Viola adunca @ BBSL (1)
_  Withheld @ BBSL__BBSLID (2); BBSL (22)

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Updated: 2024-03-29 09:23:54 gmt
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