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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 bernardina Linsley is a small species from southern California that is similar and related to Andrena omninigra Provancher. The female of bernardina is like that of omninigra in having short hairs on the thoracic dorsum and very much blackened, deeply infumate wing membranes. This female, however, has the dorsal thoracic hairs somewhat longer than in omninigra, being about as long as the flagellar width. In addition the female of bernardina has the vertex above the lateral ocellus equal to about one ocellar diameter. The male of bernardina, like that of omninigra, has black hairs mixed with the pale on the mesoscutum and the scutellum, but has the vertex above the lateral ocellus equals no more than one ocellar diameter.
FEMALE: MEASUREMENTS AND RATIOS. — N = 9; length, 11-12 mm; width, 3.0-3.5 mm; WL, 4.09 ± 0.232 mm; FL/FW, 1.02 ± 0.004; FOVL/FOVW, 2.84 ± 0.049.
DIAGNOSIS. Vestiture black; wing membranes deeply infumate, dark brown, veins black; metasomal terga black without violaceous reflections. Galeae narrow, moderately shiny basally. Labral process as in omninigra but apical part broader, about as broad as base of scape or slightly broader. Clypeus as in omninigra; vertex above lateral ocellus equals about one ocellar diameter. Pronotum as in omninigra. Mesoscutum, scutellum and propodeum sculptured as in omninigra. Mesepisternum sculptured as in omninigra but punctures separated by half a puncture width or less. Metasomal terga with coarse round punctures separated mostly by half to two puncture widths, apical margins narrowly impunctate; surfaces shiny, shagreening extremely weak if present. Thoracic dorsum with hairs short but longer than in omninigra, at most as long as width of flagellum, somewhat irregular; propodeum with weakly developed corbicula laterally, inner surface with short, relatively simple hairs, anterior margin without long hairs, dorsal margin with long plumose hairs but these sparse; scopal hairs long simple, sparse, not hiding surface of tibia.
MALE: MEASUREMENTS AND RATIOS. N = 4; length, 9-11 mm; width, 2.5-3.0 mm; WL, M = 3.36 ± 0.317 mm; FL/FW, M = 1.05 ± 0.013; FS1/FS2, M = 1.16 ± 0.085.
DIAGNOSIS. Vestiture black except mesoscutum, scutellum and metanotum with hairs largely pale, white to grayish, with long black hairs intermixed posteromedially on mesoscutum and medially on scutellum. Wings hyaline, only slightly infumate. Galeae as in female; labral process strongly reflexed, emarginate apically, broad; clypeus shiny with crowded punctures, median impunctate line absent or incomplete and extremely narrow; flagellar segment 1 longer than either segment 2 or 3, segment 2 about equal to 3 or slightly shorter, antennae short; vertex as in female. Pronotum as in omninigra; mesoscutum, scutellum and propodeum sculptured as in omninigra. Metasomal terga 2-5 with apical and basal areas shiny, unshagreened, densely punctate with punctures separated largely by half to one or two puncture widths. Metasomal tergum with basal area hairs short; hind tibial hairs relatively short, about as long as greatest width of tibia or shorter. Sternum 7 with small, distinct, apical tooth-like lobes with v-shaped median emargination, each lobe with several hairs; sternum 8 with apex distinctly broadened but not capitate, barely or not at all emarginate apicomedially (Figs. 33 and 34).
REMARKS. — A male from Boron, Kern County, California, is probably A. bernardina although it is considerably paler than most males of this species. It has intermixed dark hairs on the mesosoma, lacks the white hairs on metasomal terga 1 and 2, and the propodeal enclosure is not as rugose. We think that this male is probably correctly placed under bernardina, but should be considered only as a questionable record.
TYPE MATERIAL. The holotype female of A. (O.) bernardina (CAS No. 4,542) was collected in Tetley Park, San Bernardino Mts., California, May 23, 1936, at flowers of Potentilla glandulosa by E.G. Linsley.
DISTRIBUTION. Andrena bernardina is known to occur only in southern California (Fig. 3). It has been collected from mid-May until early July. In addition to the type material 19 female and 8 male specimens from localities listed below were examined.
CALIFORNIA. KERN CO.: Sand Canyon (3 mi W of Brown). Los Angeles Co.: San Antonio Canyon; Tanbark Flat. RIVERSIDE CO.: Sage (5 mi S); Temecula (9 mi E). SAN BERNARDINO CO.: Seeley Flat and Tetley Park, San Bernardino Mts. SAN DIEGO CO.: Mt. Palomar. SANTA BARBARA CO.: Carpenteria.
FLORAL RECORDS. Andrena bernardina has been collected only from flowers of the plants listed below. It is presumably an oligolege of Clarkia, based on pollen from specimens reported by MacSwain et al. (1973). However, too few records exist to be able to designate whether this is, indeed, an oligolege or not. It has been taken from flowers of the plants listed below.
Baccharis sp., Cryptantha sp., C. intermedia, Potentilla glandulosa.
Andrena bernardina Linsley, 1938, Proc. California Acad. Sci., Scr. 4, 23: 265, 267, 275-276.
Andrena (Melandrena) bernardina: Lanham, 1949, Univ. California Publ. Ent., 8: 221.
Andrena (Melandrena) grundeli bernardina: Linsley and MacSwain, 1955, Pan-Pacific Ent., 31: 164, 165, 166-167; Linsley, MacSwain and Smith, 1955, Pan-Pacific Ent., 31: 176.
Andrena (Onagrandrena) bernardina: Linsley and MacSwain, 1961, Pan-Pacific Ent., 37: 128; MacSwain, Raven and Thorp, 1973, Univ. California Publ. Ent., 70: 13, 16, 67.
Updated: 2021-05-13 13:07:31 gmt