Smithsonian Institution, Entomology Department · 9
Andrena sigmundi, female, face |
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Smithsonian Institution, Entomology Department · 9
Andrena sigmundi, female, side |
Smithsonian Institution, Entomology Department · 9
Andrena sigmundi, female, top |
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Smithsonian Institution, Entomology Department · 9
Andrena sigmundi, female, face |
Smithsonian Institution, Entomology Department · 9
Andrena sigmundi, female, side |
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Smithsonian Institution, Entomology Department · 9
Andrena sigmundi, female, top |
Smithsonian Institution, Entomology Department · 9
Andrena sigmundi, female, wing |
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© Copyright Laurence Packer 2014
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Andrena sigmundi MALE CFP comp |
Michael Veit · 6
Andrena sigmundi, f on Rubus -- |
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Michael Veit · 6
Andrena sigmundi, f on Leucanthemum-- |
Michael Veit · 6
Andrena sigmundi, f on Leucanthemum-- |
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Michael Veit · 6
Andrena sigmundi, f on Leucanthemum-- |
Mitchell, Bees of the Eastern United States, Vol. I, 1960 · 1
Andrena sigmundi, figure36c |
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Overview |
Reprinted with permission of the American Entomological Society from:
LaBerge, W. E. 1973. A revision of the bees of the genus Andrena of the Western Hemisphere. Part VI. Subgenus Trachandrena. Transactions of the American Entomological Society 99: 235-371.
Please report text errors to: leah at discoverlife dot org.
This is a relatively common and widespread species of northern North America. Its closest relative seems to be the western A. salicifloris Cockerell from which it can be distinguished chiefly by the shorter tergal hairs. A. sigmundi is characterized in both sexes, but particularly in the female sex, by having the posterior hind tibial spur bent and slightly expanded in the outer third to one-half. The female has the second metasomal tergum with the apical area slightly longer than the basal area and relative weakly punctate. The male is marked by having a relatively long first flagellar segment and the sixth sternum with the apical margin entire or sinuous, not deeply emarginate. Both sexes have the basal areas of terga 2 and 3 with extremely short erect hairs.
FEMALE. MEASUREMENTS AND RATIOS. — N = 20; length, 9-12 mm; width, 3-4 mm; wing length, M = 4.03 ± 0.128 mm; FL/FW, M = 1.06 ± 0.006; FOVL/FOVW, M = 3.44 ± 0.056.
INTEGUMENTAL COLOR. — Black except as follows: mandible with apical third or more rufescent; flagellar segments 2-10 dark reddish-brown to dark brown below; wing membranes moderately to slightly infumate, veins dark reddish-brown to black; terga 2-4 occasionally slightly rufescent apically; distitarsi dark brown to dark rufescent; tibial spurs dark rufescent to testaceous.
STRUCTURE. — Antennal scape length equal to first four flagellar segments; flagellar segment 1 shorter than segments 2 and 3 together, segment 2 about as long as 3, each shorter than 4, segments 2 and 3 quadrate, 4-10 longer than broad. Eyes each almost four times as long as broad, inner margins parallel. Malar space extremely short, linear. Mandible short, in repose extending beyond middle of labrum by about one-fourth its length. Galea short, broad, moderately shiny, finely tessellate and with scattered minute punctures. Maxillary palpus longer than galea by at least last two segments, segmental ratio about as 1.0:0.9:0.9:0.8:0.8:0.7. Labial palpus with first segment curved along inner margin, slightly flattened apically, segmental ratio about as 1.0:0.6:0.6:0.6. Labral process trapezoidal, twice as broad as long or slightly broader, entire to extremely slightly emarginate; labrum apical to process with several minute cristae, moderately shiny. Clypeus with coarse, round, irregularly-sized punctures separated mostly by half a puncture width, medially with longitudinal impunctate line complete or almost so; surface shiny, unshagreened except near base. Supraclypeal area with distinct round punctures separated by about half a puncture width or more, surface shiny, lightly or not at all shagreened. Genal area in profile broader than eye; laterally with small round punctures separated by half to one puncture width and fine shagreening moderately dulling surface; ventrally with fine rugulae converging towards mandibles. Vertex above lateral ocellus equals about one ocellar diameter, dulled by crowded punctures and dense reticular shagreening. Face above antennal fossae with coarse contiguous punctures, rugulae absent, surface moderately shiny, finely shagreened. Facial fovea separated from lateral ocellus by about one ocellar diameter, narrow lower portion separated from eye margin by about its own width.
Pronotum with abundant small punctures separated mostly by one puncture width or more and dense reticular shagreening dulling surface. Mesoscutum with coarse, deep, round punctures separated by half a puncture width or less except in small posteromedian area often separated by one to three puncture widths, surface shiny to moderately shiny, with or without fine reticular shagreening. Scutellum similar to mesoscutum but without shagreening. Metascutum opaque, densely punctate. Propodeum with dorsal enclosure with one median and several lateral more or less regular, longitudinal rugae, surface finely tessellate; dorsolateral and posterior surfaces finely punctatorugose; lateral surface coarsely rugulose, rugae irregular, short, surface tessellate. Mesepisternum with large coarse contiguous punctures above, with coarse punctures separated by half a puncture width below and posteriorly, surface and bottoms of punctures finely tessellate. Front femur with basal angle rounded. Posterior hind tibial spur recurved in outer half or slightly less and very slightly expanded in outer third. Pterostigma broader than from inner margin prestigma to wing margin; second submarginal cell usually receives vein 1st m-cu slightly beyond middle of cell to two-thirds distance from base of cell.
Metasomal tergum 1 with basal area punctures separated largely by one-half to one puncture width or more, medially more crowded and at extreme sides; apical area with apical two-fifths impunctate, basal three-fifths with crowded round punctures separated mostly by half a puncture width; surface shiny, unshagreened. Tergum 2 with basal area punctures variable, separated mostly by half a puncture width to as much as two puncture widths (usually by half to one puncture width); apical area with apical one-fifth to one-fourth impunctate, basal four-fifths to three-fourths with punctures usually slightly smaller and sparser than in basal area; surface shiny, unshagreened. Terga 3 and 4 similar to 2 but punctures progressively sparser. Pygidial plate (unless worn) a truncated V-shape, with strongly pointed, raised, internal triangle. Sterna with apical area and at extreme bases impunctate, otherwise densely punctate, surface dulled by fine reticular shagreening.
VESTITURE. — Generally ochraceous; vertex and thoracic dorsum dark ochraceous; with dark brown hairs on terga 5 and 6, on and surrounding basitibial plates, on outer surfaces fore and middle tibiae; inner surfaces hind tarsi and tibiae dark reddish-brown to golden; inner surfaces fore and middle tarsi yellow to red. Tergum 2 with broadly interrupted pale apical fascia usually present; tergum 3 with narrowly to broadly interrupted pale apical fascia present; tergum 4 with complete pale apical fascia but pubescence weak, barely hiding surface.
MALE. MEASUREMENTS AND RATIOS. — N = 20; length, 8-12 mm; width, 2-3 mm; wing length, M = 3.60 ± 0.200 mm; FL/FW, M = 1.09 ± 0.007; FS1/FS2, M = 0.89 ± 0.026.
INTEGUMENTAL COLOR. — Black with same exceptions as in female but flagellar segments 2-11 dark reddish-brown below, wing membranes less infumate and tegulae usually dark rufescent.
STRUCTURE. — Antennae in repose reaching propodeum; scape length equal to first two and one-fourth to two and one-third flagellar segments; flagellar segment 1 usually shorter than segment 2, rarely longer; segment 1 usually longer than broad; segments 2-11 at least one and one-half times as long as broad; lower surfaces dull. Eyes each slightly more than three and one-half times as long as broad, inner margins converging slightly towards mandibles. Malar space, mandible and galea as in female. Maxillary palpus as in female but segmental ratio about as 1.0:1.0:0.9:0.9:0.8:0.9. Labial palpus as in female but segmental ratio about as 1.0;0.8;0.8;0.8. Labral process trapezoidal, weakly emarginate; labrum apical to process shiny, nonsulcate. Clypeus as in female but median impunctate line absent or present as a short apicomedian line or shiny boss. Supraclypeal area minutely punctate, punctures separated by less than half a puncture width, surface weakly or not at all shagreened. Vertex and face above antennal fossae as in female. Genal area as in female but laterally with abundant fine longitudinal rugulae in addition to punctures.
Pronotum as in female but punctures sparse and surface opaque. Mesoscutum with coarse round punctures separated mostly by half a puncture width or slightly more except posteromedially separated by one to two puncture widths, surface dulled by coarse reticular shagreening or fine tessellation. Scutellum similar but punctures more crowded. Metanotum as in female. Propodeum as in female but lateral surfaces coarsely punctatorugose at least above. Mesepisternum moderately coarsely punctatorugose, surface and bottoms of punctures finely shagreened. Posterior hind tibial spur and wing venation as in female.
Metasomal terga with sculpturing more variable than in female. Tergum 1 as in female or basal area with punctures sparser, separated by one to two puncture widths and not crowded medially. Tergum 2 as in female but basal area punctures often somewhat sparser, apical area with punctures usually smaller and slightly sparser than in basal area; median length of apical area slightly less than that of basal area. Terga 3-5 similar to 2 but punctures progressively sparser. Tergal surfaces usually moderately dulled by fine reticular shagreening. Sterna 2-5 with apical areas and extreme bases impunctate, apical part of basal area with scattered punctures separated by three to five puncture widths; surfaces moderately dulled by fine reticular shagreening. Sternum 6 entire apically or with apical margin sinuous, not reflexed or deeply emarginate.
Terminalia as in figures 16-21; note sternum 8 with expanded, relatively flattened apex.
VESTITURE. — Generally pale ochraceous except as follows: vertex and thoracic dorsum dark ochraceous; inner surfaces tarsi yellow. Terga 2 and 3 usually with broadly interrupted pale apical fasciae; terga 4 and 5 usually with complete pale apical fasciae, but sometimes narrowly interrupted on tergum 4.
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 10 mm.; clypeus slightly convex, projecting about one-third below suborbital line, shining between deep, distinct and rather coarse and close punctures, with a very narrow, slightly elevated median impunctate line; facial foveae broad above, occupying most of space between eyes and ocelli, covered with whitish tomentum, abruptly and strongly constricted below, lower portion being less than half width of upper portion; space between margin of vertex and lateral ocelli subequal to their diameter; cheeks slightly broader than eyes, rounded posteriorly, rather dull, very closely, deeply and quite finely punctate, punctures being only very slightly separated above on lateral areas of vertex; malar space short; basal segment of flagellum subequal to 2nd and 3rd combined; process of labrum rather large, much broader than long, narrowed apically to the rather narrowly truncate apex; pubescence of head, thorax and legs pale ochraceous, somewhat more whitish below and on the more basal portions of legs; dorsum of thorax rather dull, punctures deep, distinct, rather coarse on scutum, close over anterior half, becoming somewhat more widely separated in center posteriorly, those on scutellum very slightly coarser, irregular, to some degree separated, at least anteriorly; pleura dull, densely and rather coarsely rugose; dorsal area of propodeum oblique, triangle rather coarsely and regularly striate; propodeal corbicula quite short, but rather dense, without a distinct anterior fringe, whitish-ochraceous; trochanteral floccus rather well developed, elongate, whitish; hind tibiae rather broad, but not much broader apically than medially, apex not nearly twice width of basitarsi, scopa quite dense, hairs short, simple, whitish-ochraceous, becoming somewhat fuscous toward base, fore and mid basitarsi only slightly narrower than their respective tibiae; 2nd submarginal cell somewhat shorter than 3rd, receiving 1st recurrent about one-third from apex; abdominal terga somewhat shining between deep, distinct and rather coarse and close punctures, these somewhat more sparse along basal portion of discs adjacent to the apical impressed areas, which are rather shallow but broad, occupying medially fully one-half length of disc, becoming narrowly yellowish-hyaline along rims, discal pubescence very thin, short, suberect, entirely pale, terga 2 and 3 with thin, obscure, whitish, apical fasciae evident laterally, widely interrupted medially, tergum 4 not fasciate, tergum 5 with a pale brownish, apical fimbria.
MALE. — Length 9 mm.; clypeus slightly convex, projecting about one-third below suborbital line, shining between close, deep, distinct and quite coarse punctures; space between margin of vertex and lateral ocelli slightly greater than their diameter; cheeks very slightly broader than eyes, rounded posteriorly, dull, very finely and closely punctate, punctures becoming somewhat more sparse, shallow and obscure on vertex laterally, which is densely tessellate; malar space short, but distinct; basal segment of flagellum slightly longer than broad, considerably shorter than 2nd and following segments; process of labrum much broader than long, slightly narrowed to the broadly truncate apex; mandibles with a distinct, inner, subapical tooth, overlapping but very slightly; pubescence of head, thorax and legs pale ochraceous; dorsum of thorax rather dull, punctures of scutum deep and distinct, quite close anteriorly, becoming somewhat more sparse in center posteriorly, those on scutellum somewhat more coarse but irregular, to some degree separated anteriorly; pleura rather coarsely and shallowly rugose; dorsal area of propodeum oblique, triangle rather coarsely and regularly striate; basitarsi slender and elongate, narrower than their respective tibiae; 2nd submarginal cell somewhat shining between deep, distinct, but rather fine punctures, these well separated but not sparse, apical impressed areas shallow and obscure, occupying medially less than half of length of disc, becoming very narrowly and obscurely brownish-hyaline apically, discal pubescence very short, thin, erect, entirely pale, apical fasciae very poorly developed, to some degree evident laterally; apical portion of sternum 8 slender and elongate, slightly broadened apically, the apex subtruncate, clothed beneath with quite dense, pale pubescence; penis valves slender apically, only very slightly broadened toward the base, deeply excavated laterally, gonocoxites abruptly dilated apically, forming subtriangular, rather deeply concave lobes, which are slightly produced at tips, gonocoxal lobes strongly produced, narrow and acute, attaining the apical lobes (similar to hippotes, fig. 37).
DISTRIBUTION. — Saskatchewan, Minnesota and Wisconsin, east to New Brunswick and the New England states, south to Georgia; March to June.
FLOWER RECORDS. — Amelanchier, Prunus, Rubus and Salix.
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Updated: 2024-04-26 07:17:05 gmt
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