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· 9
Andrena erythronii, female, face 2012-08-03-16.01.10 |
© Copyright Laurence Packer 2014
· 7
Andrena erythronii FEM CFP comp |
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© Copyright Laurence Packer 2014
· 7
Andrena erythronii MALE comp |
Mitchell, Bees of the Eastern United States, Vol. I, 1960 · 1
Andrena erythronii, figure40e |
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Mitchell, Bees of the Eastern United States, Vol. I, 1960 · 1
Andrena erythronii, figure41c |
Mitchell, Bees of the Eastern United States, Vol. I, 1960 · 1
Andrena erythronii, figure42c |
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Beatriz Moisset · 1
Andrena erythronii, Beatriz Moisset |
Beatriz Moisset · 1
Andrena erythronii, Beatriz Moisset1 |
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Overview |
Reprinted with permission of the American Entomological Society from:
LaBerge, W. E. 1987. A revision of the bees of the genus Andrena of the Western Hemisphere. Part XII. Subgenera Leucandrena, Ptilandrena, Scoliandrena and Melandrena. Transactions of the American Entomological Society 112: 191-248.
Please report text errors to: leah at discoverlife dot org.
Andrena erythronii, a moderately large spring bee of eastern North America, is associated with trout lilies (Erythronium spp.). Both sexes of erythronii can be distinguished from those of barbilabris by the more distinct pronotal humeral angles and dorsoventral ridges and by the very weak terga fasciae. The female of erythronii is further marked by a labral process distinctly broader than long, the clypeus being strongly flattened and more or less shiny, and the propodeal dorsal enclosure being weakly sculptured. The male of erythronii is further marked by the sterna having weakly formed subapical fimbriae and tergum 7 without or with an extremely narrow pygidium-like area.
FEMALE. MEASUREMENTS AND RATIOS. — N = 20; length, 11-13 mm; width, 3-4 mm; wing length, M = 4.08 ± 0.163; FL/FW, M = 0.97 ± 0.004; FOVL/FOVW, M = 2.72 ± 0.032.
INTEGUMENTAL COLOR. — Black except as follows: mandible with apical half rufescent; flagellum below dark reddish-brown; wing membranes hyaline, veins dark brown to reddish-brown, stigma usually rufescent; terga and sterna with narrow apical hyaline areas; tibial spurs testaceous to rufescent; distitarsi rufescent.
STRUCTURE. — Antennal scape length equals first three and one-half flagellar segments; flagellar segment 1 longer than segments 2 plus 3, each of which is broader than long; segments 4-10 quadrate or longer than broad. Eyes each about three and three-fourths times as long as broad, inner margins parallel to extremely
slightly converging towards vertex. Mandibles, malar space and galeae as in barbilabris. Maxillary palpus with segmental ratio about as 0.9:1.0:0.8:0.8:0.8:0.8. Labial palpus with segmental ratio about as 1.0:0.5:0.5:0.7. Labral process large, broader than long, entire or weakly emarginate; labrum below process convex, dulled by fine punctures and shagreening, with weak median crista. Clypeus flattened, with round punctures separated by half to one puncture width except in broad median longitudinal impunctate area; surface shiny to moderately so, shagreened laterally and posteriorly. Supraclypeal area, face above antennal fossae and facial foveae as in barbilabris. Vertex moderately tall, above lateral ocellus equals about one ocellar diameter, dulled by fine tessellation and obscure punctures. Genal area sculptured as in barbilabris.
Pronotum laterally with distinct but blunt humeral angles and weak blunt dorsoventral ridges, surface sculptured as in barbilabris. Metasoma and scutellum as in barbilabris but punctures more crowded at least anteriorly and laterally on mesoscutum. Propodeum with dorsal enclosure dull, tessellate, weakly roughened in small posteromedian area; outside of enclosure as in barbilabris. Mesepisternum as in barbilabris.
Metasomal terga dull, opaque at base to weakly shiny in apical areas, tessellate, impunctate. Pygidial plate V-shaped with blunt apex (rounded when worn), with distinct raised internal triangular area. Sterna sculptured as in barbilabris.
VESTITURE. — Pale ochraceous to ochraceous except as follows: facial foveal tomentum usually brown; dorsum of thorax often darker ochraceous than elsewhere; terga 2-4 with weak apical pale fasciae interrupted medially on terga 2 and 3; terga 5 and 6 brown to dark brown. Clypeus with hairs suberect, largely curved forwards. Pollen-collecting hairs as in barbilabris but propodeal corbiculum complete without internal hairs; terga with basal area hairs moderately long, sparse, mostly erect.
MALE. MEASUREMENTS AND RATIOS. — N = 20; length, 9-11 mm; width, 2-3 mm; wing length, M = 3.60 ± 0.227 mm; FL/FW, M = 0.96 ± 0.005; FS1/FS2, M = 2.04 ± 0.046.
INTEGUMENTAL COLOR. — As in female except terga and sterna with broader apical-hyaline margins and sterna usually rufescent basally.
STRUCTURE. — Antenna moderately long, in repose reaching scutellum; scape length and flagellar segments as in barbilabris. Eyes each about three times as long as broad, inner margins parallel or converging slightly towards vertex (especially in large specimens). Mandibles, malar space and galeae as in female. Maxillary palpus as in female. Labial palpus with segmental ratio about as 1.0:0.6:0.6:0.7. Labral process broad at base, abruptly narrowed in apical half, with distinct but shallow apical emargination, shiny; labrum apical to process punctate basally, shiny, without distinct crista. Clypeus flat, with small round punctures separated by half to one puncture width except in small impunctate apicomedian area; surface shiny, unshagreened except occasionally delicately so posteriorly. Supraclypeal area, face above antennal fossae and vertex as in female. Genal area as in barbilabris.
Pronotum as in female with blunt angles and dorsoventral ridges. Mesoscutum with obscure shallow punctures, surface opaque, tessellate. Scutellum shiny to moderately shiny, punctures separated by half to two puncture widths. Propodeum and mesepisternum as in female.
Metasomal terga opaque, dulled by coarse regular tessellation, punctures sparse, minute, obscure. Tergum 7 with pygidial area absent (covered by hairs) or extremely narrow. Sterna sculptured as in barbilabris. Sternum 6 with apical margin flat, gently emarginate medially. Terminalia (Figs. 26-30) as in cymatilis but sternum 7 distinctly emarginate apically and gonostylus less angulate medially in lateral view.
VESTITURE. — Generally white to pale ochraceous. Terga 2-5 with weak apical pale fasciae, broadly interrupted medially on terga 2 and 3. Sterna 2-5 with weak subapical fimbriae.
Reprinted with permission from: Mitchell, T.B. 1960. Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 141.
FEMALE. — Length 11 mm.; clypeus flattened medially, projecting fully one-half below suborbital line, somewhat shining, with a distinct, median, slightly elevated, impunctate line on each side of which the punctures are rather fine, but deep and distinct, rather close; facial foveae rather broad, occupying above most of area between eyes and ocelli (as in recta, fig. 43), covered with pale ochraceous tomentum; space between margin of vertex and lateral ocelli subequal to their diameter; cheeks broader than eyes, rounded posteriorly, rather smooth but dull, exceedingly minutely and obscurely punctate; malar space very short; basal segment of flagellum very slightly longer than 2nd and 3rd combined; process of labrum broadly subtriangular, with a narrowly truncate tip; mandibles of moderate length, with a distinct, subapical, inner tooth; pubescence of head, thorax, and legs entirely pale, tinged with yellowish above and on the more apical leg joints, more whitish below, thoracic integument dull, tessellate, punctures of scutum and scutellum fine, shallow and rather obscure, well separated anteriorly, becoming quite sparse on scutum posteriorly and on scutellum; pleura not visibly punctate; triangle of propodeum tessellate, not visibly differing from adjacent areas, propodeal corbicula well developed, with a distinct, anterior fringe, whitish; trochanteral floccus unusually long and dense, whitish; tibial scopa quite dense, hairs simple, of moderate length, pale anteriorly, more or less brownish medially; hind tibiae rather slender and elongate, apex only slightly broader than their basitarsi which are quite slender; front and mid basitarsi slightly narrower than their respective tibiae; 2nd submarginal cell considerably shorter than 3rd, receiving 1st recurrent slightly beyond middle; abdominal terga dull, finely tessellate, punctures exceedingly minute and obscure, hardly visible, apical depressed areas rather shallow, occupying medially about one-third the length of the discs, becoming yellowish-hyaline toward rims, discal pubescence short, erect, rather dense, obscurely yellowish, terga 2-4 with thin, whitish fasciae, tergum 5 with a brownish, apical fimbria.
MALE. — Length 8 mm.; clypeus broad and flat, projecting about one-half below suborbital line, somewhat shining but closely and finely punctate beneath dense, whitish pubescence; space between margin of vertex and lateral ocelli subequal to their diameter; cheeks very broad and flat, with a narrowly rounded angle opposite middle of eye, surface rather dull, punctures very minute and obscure; malar space very short; basal segment of flagellum subequal to 2nd and 3rd combined; process of labrum somewhat rounded, length about half the breadth; mandibles rather long and slender, with a distinct, inner, subapical tooth, overlapping about one-third; head slightly broader than thorax; pubescence of entire head, thorax and legs pale, tinged with yellowish above, more whitish below; thoracic integument dull, quite densely tessellate but somewhat shining on scutum posteriorly and on scutellum, where punctures are very fine and sparse, these becoming close but obscure on scutum anteriorly; pleura without visible punctures; triangle of propodeum densely tessellate, not differing markedly from adjacent areas; all basitarsi slender and elongate, slightly narrower than their respective tibiae; 2nd submarginal cell considerably shorter than 3rd, receiving 1st recurrent slightly beyond middle; abdominal terga dull, finely tessellate, punctures exceedingly minute and obscure, hardly visible, apical depressed areas shallow, rather narrow, becoming yellowish-hyaline along rims, discal pubescence thin, erect, rather short except on basal terga, faintly yellowish, fasciae poorly developed; apical portion of sternum 8 slender and elongate, but slightly dilated medially where there is a low ventral protuberance, long, dense pubescent from this to the rather narrowly truncate tip; penis valves only slightly expanded basally. not excavated, gonocoxites somewhat dilated apically, gonocoxal lobes slightly produced, rather broadly and evenly rounded.
DISTRIBUTION. — Illinois and Michigan to Quebec, Maine and Massachusetts; April to June.
FLOWER RECORDS. — This is recorded by Robertson (1929) on Amelanchier, Claytonia, Erigenia, Erythronium, Hepatica, Prunus and Salix.
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Updated: 2024-04-25 06:33:46 gmt
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