Reprinted with permission of the American Entomological Society from:
LaBerge, W. E. 1971b. A revision of the bees of the genus Andrena of the Western Hemisphere. Part IV. Scrapteropsis, Xiphandrena, and Rhaphandrena. Transactions of the American Entomological Society 97: 441-520.
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This is a small species closely related to A. stipator. Like stipator, both sexes of buccata have three submarginal cells in the anterior wing and lack the humeral angle and dorsoventral ridge on the pronotum. The female of buccata can be told from that of stipator by the much more coarsely rugose ventral surface of the genae, the more sparsely punctate mesoscutum and the much less punctate metasomal terga. The male of buccata resembles that of biareola and differs from that of stipator in the black hairs on the head, the short second flagellar segment, the less punctate terga and the coarse genal rugae.
FEMALE. MEASUREMENTS AND RATIOS. — N = 12: length, 8-10 mm; width, 2.5-3.0 mm; wing length, M = 3.37 ± 0.199 mm; FL/FW, M = 0.92 - ± 0.005; FOVL/FOVW (N = 10), M = 3.11 ± 0.074.
INTEGUMENTAL COLOR. — Black with same exceptions as in biareola.
STRUCTURE. — Antennae as in stipator. Eyes each almost four times as long as broad, inner margins parallel. Malar space, mandible and galea as in imitatrix. Maxillary palpus as in imitatrix but segmental ratio about 1.0: 1.0: 0.8: 0.8: 0.7: 0.7. Labial palpus as in imitatrix but ratio about 1.0: 0.7: 0.5: 0.6. Labral process and labrum as in stipator. Clypeus as in stipator, with impunctate median line present. Supraclypeal area, vertex and face above antennal fossae as in stipator. Genal area as in stipator except as follows: lateral surface with well-formed rugulae especially in posterior two-thirds of lower half or more; ventral surface with well-formed, coarse, longitudinal rugulae converging towards mandibles.
Pronotum normal, as in stipator. Mesoscutum with area between parapsidal lines with punctures separated mostly by three to five puncture widths or more, short posterior declivity with only one or two rows of crowded punctures and these separated largely by about one puncture width. Scutellum, metanotum and propodeum as in stipator. Mesepisternum as in stipator but most of surface with punctures separated by half to one puncture width, densely tessellate. Wing venation as in stipator but vein 1st m-cu often meets second submarginal cell near middle. Legs as in stipator; middle femur broad.
Metasomal tergum I with basal area punctures mostly separated by two to three puncture widths; apical area punctures smaller, separated mostly by one to two puncture widths, surface shiny, reticular shagreening present but delicate. Tergum 2 similar to 1 but basal area punctures more crowded, separated largely by one to two puncture widths. Tergum 3 with basal area punctures as in tergum 2 but apical area punctures minute, obscure, sparse. Tergum 4 with basal area punctures as in tergum 1 and apical area punctures extremely minute and sparse, surface of apical area reticularly shagreened. Pygidial plate and sterna as in stipator.
VESTITURE. — Generally white except abundant brown hairs on face above antennal fossae, surrounding facial foveae and on occiput near compound eyes: mesoscutum with a few brown hairs medially; basitibial plates and surrounding them with dark brown hairs; terga 6 and 7 with a few brown hairs medially.
MALE. MEASUREMENTS AND RATIOS. — N = 2; length, 8.5 mm; width, 2.5 mm; wing length, 3.20-3.33 mm; FL/FW, 0.93-0.95; FS1/FS2, 1.24-1.25.
INTEGUMENTAL COLOR. — Black with same exceptions as in stipator male.
STRUCTURE. — Antennae as in stipator but flagellar segment 1 equal in length to 3 and segment 2 shorter than 3 and quadrate, 3-11 longer than broad. Eyes each about two and one-half times as long as broad, inner margins converging towards mandibles. Mandible (not decussate), malar space and galea as in female. Maxillary palpus as in female but segmental ratio about 1.0: 1.0: 1.0: 0.9: 0.7: 0.7. Labial palpus as in female but ratio about 1.0: 0.7: 0.4: 0.5. Labral process, clypeus. supraclypeal area. vertex and face above antennal fossae as in stipator. Genal area in profile broader than eye (about as 5: 4); laterally with fine longitudinal rugulae. minute punctures and reticular shagreening dulling surface; ventrally with distinct longitudinal rugae parallel to hypostomal carinae.
Pronotum as in female, without humeral angles and ridges. Thoracic sculpturing as in stipator except as follows: mesoscutal punctures small. separated mostly by two to three puncture widths medially, obscured by dense tessellation; propodeum with dorsal enclosure with rugulae fine and highly irregular giving surface a coarsely granular appearance; mesepisternum with minute punctures and fine tessellation, not punctatorugose. Wing venation as in female. Legs as in stipator.
Metasomal terga as in biareola, apical areas terga impunctate. reticularly shagreened. Sterna as in biareola. Terminalia as in figures 49-53; note the following: similar to stipator but gonostylus longer; dorsal lobe gonocoxite turned inwards more; sternum 8 with apical narrow part longer.
VESTITURE. — Color and distribution of hairs essentially identical to that of biareola.
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