Notes: Female with only 3 teeth, but at least in some specimens there can be a very very tiny tooth on the side of the second tooth, near the cutting edge.Hairs on sternites noticably longer than most species except S6 which is abruptly short haired and and nearly jet black...more densely haired than other species. Tongue suppppppperrrrr long extending almost to end of abdomen. Male. The prominent projecting plate off of T6 is convex unlike almost all other Megachile species, appears almost like a cowling. Rim of T6 deeply and broadly concave with a projecting rounded lobe at each end. S6 triangular in the center and pointed, visible from above because of the concave part of T6.
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 11 mm.; entirely black, including tegulae and legs, tibial spurs yellow;eyes subparallel; clypeal margin about straight, with a very shallow, emarginate area on each extreme side; mandibles 3-dentate, a long bevelled edge between the 2nd and 3rd teeth (fig. 47); glossa extremely long, reaching nearly to tip of abdomen, and 2nd segment of labial palpi about four times length of the 1st; lateral ocelli very slightly nearer margin of vertex than to each other; cheeks very slightly broader than eyes; vertex somewhat shining, punctures quite deep and distinct, rather fine and close between ocelli medially, becoming slightly more coarse and distant on each side, close on cheeks, rather fine above, somewhat coarser below; face with some shining spaces just below anterior ocellus, but otherwise very finely and closely punctate, supraclypeal area somewhat more coarsely and densely so, punctures quite uniformly close and deep on clypeus; pubescence of face below ocelli rather c&pious, white, that on cheeks white and rather thin above, becoming somewhat longer below, black between ocelli and across vertex; pubescence whitish, rather copious on thorax laterally and posteriorly, but largely black on scutum, hairs erect, quite copious, becoming pale at extreme sides and across anterior margin, scutellum with a few, black hairs interspersed through the generally pale, erect pubescence; scutum and scutellum quite closely, deeply and distinctly punctate, punctures slightly separated medially, becoming crowded between notaulices and tegulae and on scutellum laterally, axillae very finely and densely punctate; punctures of pleura rather coarse, quite close but shallow below, becoming somewhat finer above; lateral faces of propodeum rather smooth but dull, posterior face with rather close but very minute and vague punctures; all basitarsi distinctly shorter and narrower than their tibiae; tegulae minutely and closely punctate; wings subhyaline, veins piceous; abdominal terga 2-5 rather shallowly grooved or depressed across base, basal margin of these subcarinate, apical margins of terga quite deeply depressed laterally, less so medially on the more basal terga, densely white fasciate, these very narrow medially on 2 and 3, but complete on all; tergum 1 with copious, long and erect, whitish pubescence, discal pubescence of 2 pale, rather long and erect in large part, with a few black hairs laterally, that of 3-6 black, rather short but quite dense and erect; punctures very fine and close on terga 1 and 2, slightly coarser and more distinctly separated on 3-5, 6 very slightly concave in profile, with abundant, erect, black pubescence visible, a few pale, appressed hairs toward tip, punctures very fine and close throughout; sternum 6 well covered with rather short, black, scopal hairs, with a dense fringe of very short, dark hairs along apical margin; scopa otherwise very pale yellowish
or whitish; punctures of sternum 2 quite fine and close, becoming somewhat more coarse and sparse on 3-5, apical margins depressed and obscurely hyaline, sternal fasciae absent.
MALE—Length 9 mm.; black, including legs in large part, tegulae somewhat more brownish, spurs pale yellow; eyes subparallel; clypeal margin straight beneath the dense beard; mandibles 3-dentate, with a rather slender, sharply acute, basal inferior process; glossa extremely long, reaching nearly to tip of abdomen, 2nd segment of labial palpus fully four times the length of segment 1; apical segment of flagellum slender; lateral ocelli very slightly nearer margin of vertex than to eyes; cheeks subequal to eyes in width, obscurely angulate below; vertex somewhat shining, punctures deep and distinct, quite uniformly and slightly separated, becoming somewhat finer and closer on cheeks below, some shining spaces just below anterior ocellus, face otherwise very finely and closely punctate throughout; pubescence white, quite elongate and copious on face, clypeus and lower half of cheeks, elongate and erect but rather thin on vertex and cheeks above, largely pale, with scattered, somewhat shorter, black hairs intermixed; pubescence white and quite copious on thorax laterally and posteriorly, scutum with a transverse patch of fuscous pubescence over posterior half, more distinctly whitish anteriorly, scutellum with a few, fuscous hairs intermixed with the generally white, erect pubescence; punctures of scutum quite deep and distinct, close in general, slightly separated only in center, and slightly separated in mid-line of scutellum but quite finely and closely punctate on each side, punctures of axillae very fine and densely crowded; pleura rather dull, punctures shallow but close, slightly coarser below, fine and densely crowded above; lateral faces of propodeum smooth but dull, posterior face with rather close, minute and somewhat vague punctures; front basitarsus slightly dilated, nearly equalling its tibia in width, and shallowly excavated anteriorly, following segments more or less testaceous, posterior fringe dense and white but rather short; front femur quite broadly dilated medially, lower margin strongly bowed and subcarinate, entirely piceous; front coxal spines slender and elongate, subacute apically, coxae largely bare but each with a small patch of inconspicuous pale bristles at base of spine; mid tibial spurs well developed, mid tarsi with a rather thin but elongate posterior fringe, basitarsi quite narrow and short relative to the tibiae; tegulae minutely and closely punctate; wings subhyaline, veins, brownishpiceous; abdominal terga 2-5 slightly depressed across base, basal margin of depression subcarinate, apical margins of terga rather deeplybut narrowly depressed laterally, these not evident medially on the more basal terga, but complete and deeper on the more apical terga, quite densely white fasciate, especially laterally; discal pubescence of terga 1 and 2 quite copious and elongate, entirely white, tergum 3 with a few, black hairs toward apical margin but pale basally, largely black, erect and rather copious on 4 and 5; punctures of terga 1 and 2 very fine and uniformly close, becoming somewhat more distinctly separated on 3 and 4, rather irregular and substriate on 5, carina of 6 subtriangular in outline, entire medially, margin with a few irregularities on each side, the carina slightly downcurved at tip, median teeth of apical margin broadly and conspicously carinate, subequally distant from each other and the obscure, lateral angles which are not definitely dentate; tergum 7 triangularly acute; sterna 1-4 exposed, very finely and rather closely punctate, punctures becoming sparse apically on 3 and 4, apical margins narrowly depressed and hyaline, rather thinly long pubescent; sternum 5 with rather extensive, distinctly delimited, apical, pubescence plates on each side, setose area rather broad and short, separated from basal margin by a membraneous area, partially divided medially and well covered with robust, apically dilated setae (fig. 46); sternum 6 with small, well separated, setose areas, setae flexed apically, apical lobe quite expansive, broader than long, lateral angles slightly produced; gonocoxites narrowed above base, robust apically, slightly sinuate, obliquely compressed, slightly dilated and short setose apically (fig. 55).
DISTRIBUTION—New Jersey to Texas and Oklahoma, May and June.
FLOWER RECORDS—This collects pollen from Oenothera laciniata, but has also been collected visiting Ceano thus meriolex and Pent stemon.