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 oenotherae is one of our most common Onagrandrena. The female can be recognized by being entirely black with relatively long dorsal thoracic vestiture, relatively dense scopal hairs, and relatively densely punctate clypeus and metasomal terga. The male of oenotherae has the dorsal thoracic hairs white without black hairs, clypeal hairs all or mostly pale, and the mesepisternum and propodeal surface outside of the dorsal enclosure coarsely sculptured, punctatorugose.
FEMALE: MEASUREMENTS AND RATIOS. — N = 20: length. 11-14 mm: width, 3-4 mm; WL, M = 3.90 ± 0.196 mm: FL/FW, M = 1 .(»6 ± 0.010: FOVL/FOVW, M = 3.06 ± 0.050.
DIAGNOSIS. Vestiture black; wing membranes hyaline, slightly infumate, veins dark brown to black; metasomal terga black without metallic reflections. Galeae moderately long, dulled by fine shagreening; labral process (Fig. 11) longer than half length of labrum, sides strongly concave, apical part narrower than base of first flagellar segment, usually entire, rarely somewhat knobbed and slightly emarginate at apex (apex appears heart shaped). Clypeus with punctures large, deep, crowded, separated mostly by half a puncture diameter, larger apicomedially, surface shiny, unshagreened except occasionally shagreened near base, without median impunctate line; vertex above lateral ocellus equals one ocellar diameter or slightly less; ocelli not enlarged or only slightly so. Pronotum without humeral angle or vertical ridge laterally. Mesoscutum with abundant small punctures separated mostly by half a puncture width, surface dulled by fine dense shagreening; scutellum punctatorugose, shagreened. Propodeum with distinct dorsal surface: dorsal enclosure with coarse irregular rugulae (Fig. 12), often with median longitudinal ruga; dorsal surface outside of enclosure and posterior surface moderately coarsely punctatorugose; surfaces moderately dulled by shagreening. Mesepisternum punctatorugose, dull. Terga 2 — 4 apical areas with punctures separated mostly by 1 to 3 puncture widths, basal areas with punctures separated mostly by half to one puncture widths, surfaces shiny. Thoracic dorsum with hairs much longer than width of scape; propodeum without distinct corbicula laterally, hairs long and plumose; scopal hairs long simple, moderately abundant, hiding surface to some degree.
MALE: MEASUREMENTS AND RATIOS. — N = 20; length. 9-11 mm; width, 2-3 mm; WL, M = 3.49 ± 0.201 mm; FL/FW, M = 1.07 ± 0.005; FS1/FS2, M = 1.24 ± 0.025.
DIAGNOSIS. Vestiture black except as follows: mesonotum, scutellum and metanotum with dorsal surfaces with long white hairs: vertex with some long white hairs mixed with black; metasomal tergum I with pale hairs basally (may be mixed with long black hairs), tergum 2 occasionally with basal area with several pale hairs especially basomedially. Wing membranes hyaline, slightly infumate apically, veins dark reddish brown to black. Metasomal terga black, apical areas dark brown, slightly translucent. Galeae as in female: labral process bidentate: clypeus densely punctate, without median impunctate line: surface shiny, unshagreened; vertex above lateral ocellus equals about one ocellar diameter; flagellar segment I with minimum length equal to segment 3, usually slightly longer than segment 2. Pronotum as in female; mesoscutum and scutellum as in female but punctures smaller; propodeum as in female but dorsal enclosure with rugulae almost always irregular (Fig. 10), rarely with median ruga; mesepisterna punctatorugose, dull. Metasomal terga 2-5 with apical area punctures separated by one to three puncture widths, often restricted to basal half of apical area, surfaces shiny, lightly shagreened if at all. Metasomal tergum 2 with basal area hairs long, mediobasally halt as long as those of tergum 1 or longer; hind tibiae with outer surface hairs long, sparse, along anterior margin some almost as long as dorsal femoral hairs. Genital capsule as in Figs. 13 and 14. Sternum 7 with apical margin in two rounded lobes and median emargination: sternum y weakly capitate, not at all or barely emarginate apicomedially (Figs. 41 and 42).
TYPE MATERIAL. The holotype female of Andrena (O.) oenotherae (CAS No. 14368) was collected at Gavilan, Riverside County. California, March 20, 1932 by C. M. Dammers from flowers of Oenothera (perhaps Camissonia) sp. The holotype female (CAS No. 11, 275) of A. (O.) convallaria was collected from 2.5 miles S of Livingston, Merced County, California, March 20, 1960 by G. I. Stage from flowers of Camissonia (as Oenothera) campestris. The holotype female of A. (O.) subhyalina (CAS No. 11, 276) was collected at Boron, Kern County, California, April 3, 1959, by J. W. MacSwain from Camissonia (as Oenothera) campestris. The holotype female of A. (O.) oraria (CAS No. 11, 278) was collected from beach one mile NE of Point Reyes light-house, Marin County, California, April 19, 1959, by J. W. MacSwain from flowers of Camissonia (as Oenothera) cheiranthifolia cheiranthifolia. The holotype female of A. (O.) actitis (CAS No. 11, 279) was collected at Fleishaker Zoo (SW corner of), San Francisco. California. May 21, 1959 by. MacSwain from flowers of Camissonia (as Oenothera) cheiranthifolia cheiranthifolia.
DISTRIBUTION. Andrena oenotherae is known to occur from central cismontane California south into Baja California del Norte (Linsley. MacSwain, Raven, and Thorp, 1973, p. 30) (Fig. 5). Timberlake (1937) lists this species from Arizona (Cave Creek, Chiricahua Mts.), but this has not been verified. It has been collected from January 16 through July 9 but mostly from March through early June. A total of 1.119 females and 499 males were examined from localities listed below.
CALIFORNIA. CONTRA COSTA CO.: Antioch. FRESNO CO.: Coalinga(5 mi. W); Jacolitos Canyon; Kerman (9 mi. W). IMPERIAL CO.: Coyote Wells (6 mi. W): Sunrise Butte. KERN CO.: Bakersfield (18 and 20 mi. E, 7.3 mi. N); Bealville: Blackwell’s Corner (and 9.6 mi. N); Boron; Edison (5 and 6 mi. E); Frazier Park; Frazier River (6 air mi. E of Tupman); Lebec; Short Canyon (6.5 mi. NW Inyokern); Tejon Canyon: Weldon (and 10 mi. S). LOS ANGELES CO.: Alatimos Bay; Altadena; Azusa (3 mi. N); Camp Baldy; Claremont; Devil's Punchbowl; Elizabeth Lake Canyon; El Segundo Sand Dunes; Glendale; Irwindale; La Crescenta; Lancaster (and 18 mi. W); Little Rock; Manhattan Beach; Mescal Wildlife Sanctuary; Palmdale; Pasadena; Point Dume; Redondo Beach; San Gabriel Canyon; San Gabriel Mts.; San Gabriel Wash: Whittier. MADERA CO.: Oakhurst (Cemetery and 3.7 mi. W). MARIN CO.: Dillon Beach; Point Reyes Lighthouse (1 mi. NE); Point Reyes National Seashore (North Beach). MERGED CO.: Livingston (2 mi. SW and 2.5 mi. S). MONTEREY CO.: Bradley (1.5 mi. W). ORANGE CO.: Balboa Island; Laguna Beach; Newport: Newport (upper) Bay; Newport Beach. RIVERSIDE CO.: Elsinore (and 4 mi. E); Gavilan; Hemet (and 6 mi. S); Homeland: Palm Springs: Mira Loma; Perris; Riverside; Sage (5 mi. S); Santa Ana River; Soboda Hot Springs: Sunnymead; Temecula (7 and 9 mi. E); Wineville. SACRAMENTO CO.: Brannon Island Stale Park. SAN BERNARDINO CO.: Adelanto; Alia Loma; Desert Springs; Kramer Junction (4 mi. S); Phelan (2 mi. S); Redlands: San Bernardino (10 mi. W); Verdemont; Victorville (11 mi. S). SAN DIEGO CO.: Border Field State Beach; Borrego: Carlsbad (and 2 mi. S); Coastal Sage area; Coronado; Del Mar; Dulzura; Jacumba; Lakeside: Newton; Oceanside: Pauma; Pine Valley (1 mile N); San Diego and Mission Bay; San Pasqual (4 mi. E); Solana Beach. SAN FRANCISCO CO.: Fleishaker Zoo; Sand Dunes; San Francisco. SAN LUIS OBISPO COUNTY: Bee Rock (1.8 mi. W); Creston (2.5 mi. S): Santa Margarita (4.5 and 5 mi. NE): Shandon (6.8 mi SW); Simmler (10 mi. W). SANTA BARBARA CO.: Cuyama; Goleta; New Cuyama (and 28 mi. NW); Pine Canyon Guard Station (1.6 mi. W and 2.6 mi. E); Santa Cruz Island (Christy Beach and Fraser Point); Santa Rosa Island (Carrington Point and Skunk Point); Ventucopa (Santa Barbara Canyon). STANISLAUS CO.: Turlock. TULARE CO.: Fairview (1 mi. S); Johnsondale; Tipton (2.4 mi. S); Tulare (airpark and 4 mi. S). VENTURA CO.: Chuchupate Ranger Station (base of Frazier Mt.); Fillmore: Gorman (5 mi. S in Hungry Valley); Mugu Lagoon (Point Mugu); Point Mugu Naval Air Station (Area 1 and 2): Quatal Canyon (NW corner of county); San Buenoventura State Park (S end); Saticoy; Upper Cuyama Canyon; Ventura. MEXICO. BAJA CALIFORNIA DEL NORTE: Descanso Bay; Ensenada (3 mi. S); La Zapopita, Valle de Trinidad; Santo Tomas (7 mi. N).
FLORAL RECORDS. Andrena oenotherae is an oligolege of matinal blooming flowers of the genus Camissonia (Linsley et al., 1973) and has been collected from flowers of the plants listed below.
Acacia greggii, Agoseris heterophylla, Allysum maritimum, Anisocoma acaulis, Brassica sp., Cakilie edentulata, Calandrinia sp., Camissonia sp., C. bistorta, C. californica, C. campestris, C. c. obispoensis, C. cheiranthifolia cheiranthifolia, C. c. suffruticosa. C. claviformis claviformis, C. contorta, C. kernensis, C. micrantha, C. ovata, C. pallida, C. sierrae, Casella bursa-pastoris, Chaenactis sp., Chrysanthemum coronari.um, Coreopsis sp., C. bigelovii, C. californica, Croton californicus, Cryptantha sp., C. clevelandii, C. intermedia, Encelia actoni., Ericameria sp., E. cooperi, Eriogonum fasciculatum, Erodium sp., Gilia sp., Hemizonia kelloggii, Isomeris arborea, Lantana. sp., Lasthenia sp., Layia glandulosa, L. platyglossa, Lupinus sp., Malacothrix sp., Melilotus alba, Mirabilis californica, Oenothera ( = Camissonia) sp., Phacelia sp., Potentilla sp., Raphanus sativus, Salix sp., S. laevigata, S. lasiolepis, Sisymbrium sp., Vicia americana, Viguiera sp.
Andrena oenotherae: Bohart, 1937, Pan-Pacific Ent., 13: 54 (Nomen nudum).
Andrena oenotherae Timberlake, 1937, Pan-Pacific Ent., 13: 6971; Linsley, 1938, Proc. California Acad. Sci., Ser. 4, 23: 266, 267; Rust, Menke, and Miller, 1985, in Menke and Miller, Entomology of the California Channel Islands, San Diego, California, p. 42.
Andrena (Melandrena) oenotherae. Lanham, 1949. Univ. California Pub. Ent., 8: 221; MacSwain and Smith, 1955, Pan-Pacific Ent., 31: 173, 175, 176, 178, 180, 181-182, 183.
Andrena (Onagrandrena) oenotherae. Linsley and MacSwain, 1956, Pan-Pacific Ent., 32: 111, 112-113, 116-118, 119, 120; Linsley and MacSwain, 1961, Pan-Pacific Ent., 37: 125, 128; Linsley and MacSwain. 1963, Pan-Pacific Ent., 39: 189, 190, 192, 196; Linsley, MacSwain, Raven, and Thorp, 1973, Univ. California Publ. Ent., 71: 33-34; Davis and LaBerge, 1975, Nat. Hist. Surv., Biol. Notes No. 95, p. 10.
Andrena (Onagrandrena) convallaria convallaria Linsley and MacSwain, 1963. Pan-Pacific Ent., 39: 190-193. New synonymy.
Andrena (Onagrandrena) convallaria subhyalina Linsley and MacSwain, 1963, Pan-Pacific Ent., 39: 193-194: Linsley. MacSwain, and Raven. 1963, Univ. California Pub. Ent., 33: 71-72. New synonymy.
Andrena (Onagrandrena) oraria oraria Linsley and MacSwain, 1963, Pan-Pacific Ent., 39: 194-196; Linsley, MacSwain, Raven, and Thorp, 1973, Univ. California Publ. Ent., 71: 34-35. New synonymy.
Andrena (Onagrandrena) oraria actitis Linsley and MacSwain, 1963, Pan-Pacific Ent., 39: 196; Linsley, MacSwain, Raven, and Thorp, 1971, Univ. California Publ. Ent., 71: 35. New synonymy.
Updated: 2021-05-13 12:33:38 gmt