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Andrena flandersi Timberlake, 1937
Andrena (Melandrena) flandersi Timberlake, 1937

Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Onagrandrena

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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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This moderate-sized, dark species from southern California can be recognized in the female sex by the short plumose hairs of the thoracic dorsum and the impunctate tergal apical areas. The male of flandersi also has the tergal apical areas impunctate.

FEMALE: MEASUREMENTS AND RATIOS. N = 20; length, 10-11 mm; width, 3.0-3.5 mm; WL, M = 3.42 0.102 mm; FL/FW, M = 1.06 0.006; FOVL/FOVW, M = 3.09 0.037.

DIAGNOSIS. Vestiture black; wing membranes hyaline, scarcely or not infumate, veins dark brown; metasomal terga black without violaceous reflections. Galeae long, moderately dulled by fine shagreening. Labral process as in omninigra but apical part thick, at least as thick as base of scape, emarginate apically. Clypeus sculptured as in omninigra; vertex above lateral ocellus equals about one ocellar diameter. Pronotum without humeral angles or lateral ridge. Mesoscutum and scutellum punctate, punctures large, deep, separated mostly by half a puncture width or less, interpunctural surface shiny, unshagreened or only delicately so; metanotum with dense, extremely fine punctures dulling surface. Propodeum sculptured as in omninigra but surface outside of dorsal enclosure finely punctatorugose. Mesepisterna with distinct punctures in lower half, interpunctural surface dulled by coarse shagreening. Metasomal terga 2-4 with apical areas impunctate, shiny. Thoracic dorsum with hairs short, about as long as width of scape or shorter, erect, plumose, not scale-like, velvet-like; propodeal corbicula with internal hairs short, simple; long dorsal hairs sparse, long hairs absent along anterior margin; scopal hairs simple, long, moderately abundant.

MALE: MEASUREMENTS AND RATIOS. N = 20; length, 9-11 mm; width, 2-3 mm; WL, M = 3.26 0.159; FL/FW, M = 1.11 0.007; FS1/FS2, M = 1.13 0.024.

DIAGNOSIS. Vestiture white except as follows: metasomal terga 3-5 often with brown hairs mixed with pale hairs basally. Wing membranes hyaline, not at all infumate. Galeae as in female; labral process strongly reflexed, large, bidentate; clypeus as in female; vertex above lateral ocellus equals one ocellar diameter; flagellar segment 1 equal to or slightly longer than segment 2 and equal to segment 3, antennae relatively short. Pronotum as in female; mesoscutum and scutellum shiny as in female but punctures slightly sparser. Propodeum and mesepisterna sculptured much as in female but propodeal dorsal enclosure with rugulae denser and less coarse. Metasomal terga 2-5 with apical areas impunctate, shiny; basal areas shiny with sparse punctures (Fig. 8). Metasomal tergum 2 with basal area hairs less than half as long as those of tergum 1. Hind tibiae with outer surface hairs moderately long, with at least a few extremely long along anterior margin. Sterna 7 and 8 (Figs. 35 and 36) much as in anograe.

TYPE MATERIAL. The holotype female (CAS No. 14, 359) of Andrena (A.) flandersi was collected about 11 miles SW of Victorville, San Bernardino County, California, May 5, 1936, at flowers of Ericameria cooperi by E. G. Linsley and P. H. Timberlake.

DISTRIBUTION. Andrena flandersi is known to occur only in southern California in the Mojave Desert (Fig. 4). It has been collected from March 19 through June I4 from localities listed below. In addition to the holotype a total of 215 females and 32 males were examined.

CALIFORNIA. KERN CO.: Boron; Dove Well (5 mi. NW); Freeman Jet.; Mojave; Red Rock Canyon; Salt Wells (7 mi. W); Sand Canyon (3 mi. W of Brown); Short Canyon (6 mi. NW of Inyokern); Walker Pass (and 3 mi. SE). LOS ANGELES CO.: Acton; Little Rock (and 1 mi. W); Pallett Creek; Palmdale; Pearblossom (4 mi. S); Squaw Canyon (7 mi. S). SAN BERNARDINO CO.: Adelanto (20 mi. N); Big Panoche Creek; Desert Spring (5 mi. W); Kramer Hills; Kramer Junction (and 3 mi. S); Landers; Lucerne Valley; Morongo Valley; Phelan (2 mi. S); Red Mountain; Victorville (11 mi. SW). SAN DIEGO CO.: Borrego Springs. VENTURA CO.: Saticoy.

FLORAL RECORDS. Although Andrena flandersi has not been collected frequently on Onagraceae, it has been taken on Camissonia (as Oenothera) (Linsley, MacSwain, and Raven, 1964) and is presumably an oligolege of flowers of that genus. Most females examined by the authors have at least a few Camissonia pollen grains in their scopae. This species has been collected from flowers of the plants listed below.

Baccharis sp., Camissonia campestris, C. claviformis claviformis, C. contorta, C. kernensis, Chaenactis sp., Coreopsis sp., C. bigelovii, C. californica, Cryptantha sp., Ericameria cooperi, Lasthenia californica, Layia sp., L. glandulosa, Malacothrix sp., Oenothera ( = Camissonia ?) sp., Salix sp.

Scientific source:

Andrena flandersi Timberlake, 1937, Pan-Pacific Ent, < Cockerell, 1937, American Mus. Nov. No. 948, p. 14; Linsley, 1938, Proc. California Acad. Sci., Ser. 4, 23: 266; 278.

Andrena (Melandrena) flandersi, Lanham, 1949, Univ. California Publ. Ent., 8: 221; Linsley and MacSwain, 1955, Pan-Pacific Ent., 31: 164, 166, 167; Linsley, MacSwain and Smith, 1955, Pan-Pacific Ent., 31: 176, 183.

Andrena (Onagrandrena) flandersi: Linsley and MacSwain, 1956, Pan-Pacific Ent., 32: 111, 113, 118-120; Linsley, MacSwain, and Raven, 1964, Univ. California Publ. Ent., 33: 63, 64, 65, 72, 79, 80, 82, 88, 90, 91.

Supported by

Hosts · map
FamilyScientific name @ source (records)
Asteraceae  Baccharis @ BMEC_ENT (1)

Ericameria cooperi @ UCRC_ENT (1)
Onagraceae  Oenothera sp @ BBSL (1)
Polycitoridae  Salix sp @ BBSL (1)

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Updated: 2024-04-23 21:16:55 gmt
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