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David Cappaert · 9
Andrena macra, female, head, malar xtreme short, macra |
© Copyright source/photographer
· 7
Andrena macra, f back, Kent Co. MD |
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© Copyright source/photographer
· 7
Andrena macra, f, face, Kent County MD |
© Copyright source/photographer
· 7
Andrena macra, f, left, Kent Co. Maryland |
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Michael Veit · 6
Andrena macra, f at nest site -- |
Michael Veit · 6
Andrena macra, f at nest site -- |
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Michael Veit · 6
Andrena macra, f at nest site -- |
Michael Veit · 6
Andrena macra, m at nest site -- |
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Michael Veit · 6
Andrena macra, m at nest site -- |
Michael Veit · 6
Andrena macra, m at nest site -- |
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© Copyright source/photographer
· 1
Andrena macra, male, genital armature |
© Copyright source/photographer
· 1
Andrena macra, male, sternal plates 7 and 8 |
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Deana Crumbling · 1
Andrena macra female, transverse prop striae |
Deana Crumbling · 1
Andrena macra male, S8 tip shape |
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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 macra Mitchell is closely related to A. flexa Malloch, but the females can be distinguished by the pale pubescent fasciae of terga 2-4 being broadly interrupted (that of tergum 4 often absent), the terga being more narrowly hyaline apically, and the clypeus lacking a median impunctate line. In the description of the female given below all characters are assumed to be as in flexa unless specifically described as different.
FEMALE. MEASUREMENTS AND RATIOS. — N = 20; length, 11-12 mm; width, 3-4 mm; wing length, M = 4.32 ± 0.145 mm; FL/FW, M = 0.92 ± 0.003; FOVL/FOVW, M = 3.11 ± 0.037.
INTEGUMENTAL COLOR. — As in flexa except as follows; terga 1-4 with apical margins infumate or extremely narrowly hyaline; fore distitarsi, middle and hind tarsi, middle tibia apically, and hind tibia often dark rufescent.
STRUCTURE. — As in flexa except as follows: eyes usually with inner margins converging slightly towards vertex; clypeus without median impunctate line or line represented by a short segment less than one-third clypeal length; maxillary palpal segmental ratio about as 0.9:1.0:0.7:0.7:0.6:0.6; labial palpal segmental ratio about as 1.0:0.5:0.4:0.5; vertex above lateral ocellus equals one and one-half ocellar diameters or slightly more; terga 1-4 punctate as in flexa but apical areas with impunctate margin narrower, equal to less than one-fourth median length of apical area.
VESTITURE. — As in flexa except as follows: generally somewhat darker, dorsum of thorax usually dark ochraceous; terga 2-4 with apical white fasciae greatly reduced, on terga 2 and 3 lateral remnants each equals one-fourth or less of tergal width, tergum 4 with fascia absent or represented by sparse lateral pubescence.
MALE. MEASUREMENTS AND RATIOS. — N = 15; length, 8-11 mm; width, 2-3 mm; wing length, M = 3.64 ± 0.211 mm; FL/FW, M = 0.88 ± 0.004: FS1/FS2, M = 2.03 ± 0.033.
INTEGUMENTAL COLOR. — Black except as follows: mandible with apical third to half rufescent; flagellar segments 2-11 dark reddish brown below; tegulae testaceous, yellow; wing membranes lightly infumate, yellow-brown, veins red to red-brown; distitarsi dark rufescent; tibial spurs testaceous; metasomal terga 1-5 with apical areas infumate, yellow-brown, not colorless apically; sterna 2-5 with apical areas hyaline, basal areas with rufescent reflections.
STRUCTURE. — Antennae in repose barely or not quite reaching scutellum; scape length equals first two and three-fourths flagellar segments; flagellar segment 1
twice as long as segment 2 (average), longer than segment 3; segment 2 broader than long; segments 3-11 longer than broad. Eyes each about three and one-third times as long as broad, inner margins parallel. Galea, malar space and labral process u • female. Clypeus opaque, dense tessellation obscuring close-set, shallow punctures. without median impunctate line. Supraclypeal area, face above antennal fossae and vertex as in female. Genal area in profile broader than eye, sculptured as in female. with rounded angle opposite middle of eye or below.
Pronotum laterally with humeral angle and dorsoventral ridge as in female but more distinct. Thoracic sculpturing and wing venation as in female. Posterior hind tibial spur flexed in outer third as in female but much more weakly so, often extremely weakly flexed.
Metasomal terga 1-5 sculptured as in female terga 1-4 but punctures usually smaller and sparser and apical area punctures usually minute. Tergum 7 without visible pygidium-like area. Sterna 2-5 with basal area punctures separated mostly by three to five puncture widths; apical areas impunctate; surfaces moderately shiny, with reticular shagreening. Sternum 6 without reflexed margin. Terminalia as in flexa.
VESTITURE. — In general pale ochraceous to ochraceous, darker on vertex and thoracic dorsum. Terga 2-4 with lateral remnants of apical white pubescent fasciae equaling one-third (on tergum 4) or less of each tergal width; tergum 5 without apical fascia. Sterna 2-5 with subapical fimbriae of moderately long pale hairs.
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 only slightly convex, projecting about one-half below suborbital line, dull, punctures fine and quite close, without a distinct median impunctate line; facial foveae broad above, occupying most of area between eyes and lateral ocelli, covered with pale ochraceous tomentum; space between margin of vertex and lateral ocelli slightly shorter than distance between ocelli; cheeks broader than eyes, rounded posteriorly, rather dull, punctures exceedingly minute and obscure; malar space exceedingly short; basal segment of flagellum subequal to 2nd and 3rd combined; process of labrum rather small, width about twice the length, subtriangular, narrowly truncate apically; pubescence of head, of thorax laterally, and of legs pale ochraceous, that on dorsum of thorax pale fulvous, rather short and dense; scutum very closely and finely punctate, punctures becoming somewhat more sparse in center posteriorly, those on scutellum slightly more coarse, deep and distinct, well separated on each side of middle but otherwise close, surface shining; pleura dull, densely tessellate, very obscurely punctate; enclosure of propodeum dull, densely tessellate, obscurely subrugose toward basal margin; propodeal corbicula pale ochraceous, well developed, rather short, anterior fringe rather poorly developed; trochanteral floccus long, well developed, whitish; tibial scopa dense, pale fulvous to ochraceous, hairs rather elongate, simple; pubescence of basal leg joints whitish, that on tibiae and tarsi becoming ochraceous, basitarsi very slightly narrower than their respective tibiae; 2nd submarginal cell slightly shorter than 3rd, receiving 1st recurrent slightly beyond middle; abdominal terga shining, apical depressed areas rather obscure, occupying medially about one-third length of the discs, becoming reddish-hyaline toward rim, discs uniformly, deeply, finely and very closely punctate, discal pubescence extremely short, suberect, entirely whitish, white fasciae evident toward sides, widely interrupted medially on terga 2 and 3, tergum 5 with a dense apical ochraceous fimbria
MALE. — Length 9 mm.; clypeus quite flat, projecting but very little below suborbital line, dull, very finely and quite closely punctate beneath the dense pubescence; space between margin of vertex and lateral ocelli somewhat shorter than distance between ocelli, only slightly exceeding their diameter; cheeks much broader than eyes, obscurely angulate opposite middle of eye, the angle rounded (as in acra, fig. 21), surface rather dull, minutely and obscurely punctate; malar space extremely short; basal segment of flagellum longer than 2nd segment, slightly shorter than 2nd and 3rd combined; process of labrum subquadrate, slightly narrowed apically, the truncate apex slightly incised; mandibles quite slender, slightly flexed, with a distinct, rather small, inner, subapical tooth, overlapping about one-third; pubescence of head, thorax and legs white; scutum quite finely, closely and deeply punctate anteriorly, somewhat more sparsely so in middle posteriorly where surface is more shining; scutellum somewhat shining, punctures very fine, scattered and irregular, rather sparse in center; pleura very dull, tessellate, with numerous rather coarse and close punctures on upper half; enclosure of propodeum dull, tessellate, obscurely subrugose toward basal margin; all basitarsi slender and elongate, considerably narrower than their respective tibiae; 2nd submarginal cell slightly shorter than 3rd, receiving 1st recurrent slightly beyond middle: abdominal terga shining, apical margins rather narrowly and obscurely depressed, becoming reddish-hyaline toward rims, punctures of discs uniformly fine, deep and distinct, rather close except near middle, discal pubescence very short, suberect, whitish, with whitish apical fasciae evident only toward sides on terga 2 and 3; apical portion of sternum 8 rather slender, sides nearly parallel, with a very low, median, ventral ridge beyond which it is quite densely pubescent to the rather narrowly truncate tip; penis valves slender, only slightly expanded basally, not excavated, gonocoxites quite slender and elongate, very slightly dilated apically, gonocoxal lobes not at all produced.
DISTRIBUTION. — Eastern North Carolina and Virginia; April and May.
FLOWER RECORDS. — Crataegus, Pyracantha and Rubus.
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Updated: 2024-04-16 21:51:12 gmt
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