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Andrena mariae Robertson, 1891Andrena sphecodina Cockerell and Casad, 1896; Andrena mariae var concolor Robertson, 189846; Andrena (Trachandrena) submariae Viereck and Cockerell, 1914; Andrena (Trachandrena) martialis Viereck and Cockerell, 1914; Andrena (Trachandrena) sphecodiniformis Viereck and Cockerell, 1914; Andrena (Trachandrena) profundiformis Viereck and Cockerell, 1914; Andrena (Trachandrena) stricklandi Cockerell, 1936 |
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 © Rebekah Andrus Nelson Andrena mariae, female, face |
 Smithsonian Institution, Entomology Department Andrena mariae, male, face |
 Smithsonian Institution, Entomology Department Andrena mariae, male, genitalia |
 Smithsonian Institution, Entomology Department Andrena mariae, male, side |
 Smithsonian Institution, Entomology Department Andrena mariae, male, wing |
 Smithsonian Institution, Entomology Department Andrena mariae, male, face |
 Smithsonian Institution, Entomology Department Andrena mariae, male, genitalia |
 Smithsonian Institution, Entomology Department Andrena mariae, male, side |
 Smithsonian Institution, Entomology Department Andrena mariae, male, top |
 Smithsonian Institution, Entomology Department Andrena mariae, male, wing |
 Smithsonian Institution, Entomology Department Andrena mariae, female, face |
 Smithsonian Institution, Entomology Department Andrena mariae, female, side |
 Smithsonian Institution, Entomology Department Andrena mariae, female, wing |
 Smithsonian Institution, Entomology Department Andrena mariae, male, face |
 Smithsonian Institution, Entomology Department Andrena mariae, male, side |
 Smithsonian Institution, Entomology Department Andrena mariae, male, top |
 Smithsonian Institution, Entomology Department Andrena mariae, male, wing |
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Taken 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 (3): 235-371.
Andrena mariae is a common spring visitor to willows throughout much of the United States and southern Canada. It can be clearly distinguished in the female sex from either A. forbesii or A. sigmundi by the relatively broad facial foveae by which it most closely resembles A. hippotes. Unlike any of the preceding species, mariae has the metasomal integument entirely or largely bright red in color in most of the females. Dark females of mariae can be distinguished from those of hippotes by the coarser rugae of the face and the mesoscutum having coarser punctures with a dulled surface. The males of mariae can be distinguished from that of any of the following by the usually red or partly red abdomen, the long first flagellar segment and the more sparsely punctate mesoscutum. FEMALE. Measurements and Ratios.—N=20; length, 8-11 mm; width, 2.5-3.5 mm; wing length, M=3.65±0.137 mm; FL/FW, M=1.05±0.004; FOVL/FOVW, M= 3.29 ±0.50. Integumental Color.—Black except as follows: head and thorax as in sigmundi but wings with membranes hyaline or only slightly infumate, veins dark reddish-brown to brown. Terga 2-5 usually bright red, occasionally only terga 2 and 3 with red and rarely entirely dark with rufescent apical areas. Hind basitarsi and tibiae orange in pale specimens or at least basitarsi often dark; dark specimens usually with hind legs entirely dark; tibial spurs testaceous to rufescent. Structure. — Antennae as in sigmundi. Eyes each about three and one-half times as long as broad or slightly broader, inner margins parallel or extremely slightly converging towards mandibles. Malar space, mandibles and galea as in sigmundi. Maxillary palpus as in sigmundi but segmental ratio about as 1.0:1.0:0.9:0.7:0.7:0.7. Labial palpus as in sigmundi but ratio about as 1.0:0.7:0.6:0.7. Labral process as in sigmundi; labrum apical to process without sulcus, flat, shiny. Clypeus with regular, round, deep punctures separated mostly by half a puncture width or less, without impunctate median line, surface shiny, unshagreened. Supraclypeal area and genal area as in sigmundi but genal area with surface dulled by fine reticular shagreening. Vertex as in sigmundi. Face above antennae with coarse longitudinal rugae paralleling facial foveae, interrugal spaces shiny, with abundant, coarse, elongate punctures. Facial fovea broad as in hippotes but upper portion separated from lateral ocellus usually by somewhat less than one ocellar diameter to as much as one diameter. Pronotum as in sigmundi. Mesoscutum with large deep punctures with rounded edges, sparse medially, surface opaque to moderately shiny, dulled by regular tessellation. Scutellum similar but usually shiny, delicately tessellate if at all. Metascutum opaque, densely and finely punctate, tessellate. Propodeum with dorsal area with one central and five or six lateral, coarse, complete rugae, surface dulled by dense, coarse tessellation; dorsolateral and posterior surfaces finely punctatorugose, surfaces dull, tessellate; lateral surface with irregular, short rugulae especially in posterior half or more, surface dulled, tessellate. Mesepisternum punctatorugose above and anteriorly, punctures separated posteriorly, surface dull, finely tessellate. Fore femur with base rounded. Posterior tibial spur smoothly curved as in hippotes, not bent or expanded as in sigmundi. Venation as in sigmundi. Metasomal tergum 1 with basal area punctures irregular in size and spacing, usually separated by one-half to two puncture widths but some by three or more, surface shiny, unshagreened or delicately so; apical area half as long as basal area, with impunctate apical two-fifths, basally with small to minute, regular, round punctures usually separated by half to one puncture width, rarely much sparser or almost impunctate, surface shiny, delicately shagreened if at all. Tergum 2 with apical area longer medially than basal area (about as 3:2), basal area with distinct punctures separated largely by half to one puncture width, apical area rarely almost impunctate to impunctate on rim and basally with minute punctures separated by one to three puncture widths, surface shiny. Terga 3 and 4 as in 2 but basal areas slightly longer and punctures usually slightly sparser, Pygidial plate as in sigmundi. Sterna 2-5 as in sigmundi but surfaces shinier, reticularly shagreened but finely so. Vestiture. — Generally white to pale ochraceous, slightly yellower on vertex and thoracic dorsum; terga 2-4 without apical pale fasciae or these restricted to small lateral patches, basal areas with pale erect hairs sparse and short; terga 5 and 6 pale; basitibial plate and below brown; inner surface hind basitarsi golden-yellow. MALE. Measurements and Ratios.—N=20; length, 7-10 mm; width, 1.5-2.5 mm; wing length, M=3.36±0.153 mm; FL/FW, M=1.10±0.008; FS1/FS2, M=0.96±0.019. Integumental Color. — Usually black with same exceptions as in female except as follows: at least first flagellar segment usually orange below in apical half or more (occasionally segment 2 or 2 and 3 also bright orange below); terga usually with less red and entirely dark individuals more common (even in darkest sides of terga 1 and 2 usually reddened); legs black or at most distitarsi rufescent. Structure. — Antennae in repose barely reaching propodeum; scape length equal to only slightly more than flagellar segments 1 and 2 together; flagellar segment 1 usually as long as segment 2 or slightly shorter, segments all longer than broad. Eyes each three and one-half times as long as broad or slightly less, inner margins distinctly converging towards mandibles. Malar space, mandible and galea as in female. Maxillary palpus as in female but segmental ratio about as 1.0:0.9:0.7:0.7:0.7:0.7. Labial palpus as in female but ratio about as 1.0:0.7:0.7:0.5. Labral process and labrum as in sigmundi. Clypeus, supraclypeal area and genal area as in female. Face above antennae as in female but longitudinal rugae more distinct and interrugal punctures sparser and smaller. Vertex as in female. Pronotum as in female. Mesoscutum as in female but punctures smaller and surface more opaque, tessellation dense, fine. Scutellum and metascutum as in female. Propodeum as in female but dorsal area rugae often more irregular and occasionally anastomizing and lateral surfaces coarsely punctatorugose especially in posterior two-thirds or more. Mesepisterna as in female. Tibial spurs and venation as in female. Metasomal tergum 1 as in female but punctures of basal area usually more crowded and usually surface moderately dulled by transversely reticulate shagreening except on narrow shiny apical rim. Tergum 2 as in female but apical area slightly shorter than basal area medially and moderately shagreened as in tergum 1. Terga 3-5 as in female terga 2-4 but punctures denser and shagreening usually present. Sterna 2-5 as in sigmundi. Sternum 6 with apical V-shaped emargination, sculptured as in sternum 5. Terminalia much as in sigmundi; see figures 39-41. Vestiture. — Generally white or pale ochraceous and distributed as in female but without pollen-collecting hairs; note tergae lack apical pale fasciae, basal tergal areas with erect or suberect hairs short. Geographic Variation. — Although red-abdomened forms of both sexes of Andrena mariae occur throughout its range, they seem to be more abundant in the Great Plains and Rocky Mountain regions where most of the specimens are pale. In more eastern populations at least half of the specimens are of the darkest type or some intergrade between the extremes. Size seems to be correlated with this trend in color with individuals of western populations averaging slightly larger than those of eastern populations. No distinct step occurs in this clinal variation and it does not seem necessary to recognize subspecies.
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