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Text used courtesy of the Illinois Natural History Survey from:
LaBerge, W. E., Thorp, R. W., 2005. A revision of the bees of the genus Andrena of the Western Hemisphere. Part XIV. Subgenus Onagrandrena. Illinois Natural History Survey Bulletin 37: 1-63.
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Andrena vespertina is a large black bee active in the late afternoon and evening, as well as in the early morning. The female of vespertina is similar to that of oenotherae but has more densely punctate metasomal terga and the mesoscutal punctures are smaller and denser. The male of vespertina is like that of boronensis in having white clypeal hairs and white dorsal thoracic hairs without an intermixture of black hairs but has no while hairs on the pleural areas of the thorax and has the metasomal terga much more densely punctate.
FEMALE: MEASUREMENTS AND RATIOS. N = 20; length, 13.0 13.5 mm; width, 3.0-3.5 mm: WL M = 4.06 ± 0.185 mm; FL/FW, M = 1.04 ± 0.004; FOVL/FOVW, M = 2.82 ± 0.037.
DIAGNOSIS. Vestiture black; wing membranes moderately infumate, yellowish brown, veins dark brown to black; metasomal terga without metallic reflections. Galeae as in oenotherae; labral process with apical portion narrow as in oenotherae. Clypeus sculptured as in oenotherae. Vertex and ocellus as in oenotherae. Pronotum without humeral angle or lateral ridges (Fig. 15); mesoscutum and scutellum sculptured as in oenotherae but punctures slightly smaller and denser, separated entirely by half a puncture width or less, surface dull, shagreened; propodeum sculptured as in oenotherae; mesepisternum finely punctatorugose, dull, shagreened. Metasomal terga 2 and 3 with apical area punctures separated mostly by I to 3 puncture widths, basal area (especially in median third) with punctures dense, separated mostly by hall a puncture width or less, contrasting somewhat with slightly more sparsely punctate apical area; surfaces shiny. Thoracic dorsum with hairs long, dense; propodeum without distinct corbicula, hairs long and plumose; scopal hairs long, simple, moderately abundant, hiding surface to some degree.
MALE: MEASUREMENTS AND RATIOS. N = 20; length, 11-12 mm: width, 2.5-3.0 mm; WL, M = 3.73 ± 0.289 mm; FL/FW, M = 113 ± 0.004; FS1/FS2, M = 1.19 ± 0.015.
DIAGNOSIS. Vestiture black except as follows: clypeal hairs entirely white, facial hairs white except along inner margins compound eyes, vertex with white hairs, thorax with dorsal hairs while, without dark hairs, pleural hairs black without white hairs in upper part, metasomal tergum 1 usually entirely or partly white. Wing membranes hyaline, slightly infumate apically, veins dark brown to black; metasomal terga black, apical areas not or only slightly translucent. Galeae as in female; labral process and clypeal sculpturing as in oenotherae; vertex above lateral ocellus equals about one ocellar diameter; flagellar segments as in oenotherae. Pronotum as in oenotherae female; mesoscutum and scutellum sculptured as in oenotherae female but mesoscutal punctures slightly denser and pleural punctures distinct (not punctatorugose); propodeum with dorsal enclosure coarse, irregularly rugose; surface outside of enclosure, dull, finely sculptured, tessellate with indistinct punctures slightly roughening surface. Metasomal terga 2-5 (especially 2 and 3) with apical area punctures separated by 1 to 3 puncture widths, often restricted to basal half or slightly more; basal area punctures dense, separated mostly by half to one or two puncture widths and contrasting with more sparsely punctate apical areas. Metasomal tergal hairs and hind tibial hairs as in oenotherae. Sternum 7 with broad apical lobes and small apicomedian emargination, hairs weak but abundant; sternum 8 capitate with weak apicomedian emargination, hairs slender relatively sparse (Figs. 47-48).
TYPE MATERIAL. The holotype female of Andrena (Onagrandrena) vespertina (CAS No. 6,710) was collected 18 miles E of Bakersfield, Kern County, California, April 19, 1958, at flowers of Camissonia boothii (as Oenothera decorticans) by E.G. Linsley.
DISTRIBUTION. Andrena vespertina is known from the type locality and Del Puerto Canyon, 21 mi. W Patterson, Stanislaus Co. (Fig. 5). It was collected several times from March 9 through June 12 (Linsley et al. 1973). We have examined 74 females and 95 males.
CALIFORNIA. KERN CO.: Bakersfield (18 mi, E). STANISLAUS CO.: Del Puerto Canyon (21 mi. W of Patterson).
FLORAL RECORDS. Andrena vespertina is considered to be an oligolege of Camissonia boothii and is known to forage during late evenings. It has been collected from flowers of the plants listed below.
Camissonia boothii (as decorticans), C. campestris, Isomeris arborea.
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Andrena (Onagrandrena) vespertina Linsley and MacSwain, 1961, Pan-Pacific Ent., 37: 123-125; Linsley and MacSwain, 1963, Pan-Pacific Ent., 39: 193; Linsley, MacSwain, Raven and Thorp, 1973, Univ. California Publ. Ent., 71: 27, 35-36, fig. 15, table 10.
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Updated: 2024-04-25 07:45:32 gmt
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