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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.
Please report text errors to: leah at discoverlife dot org.
Andrena rubrotincta is the first of four species described below that are marked in both sexes by having a well-formed pronotal humeral angle and lateral ridge. The lateral ridge, especially in the females, is not sharply formed but somewhat rounded and the humeral angle is not strongly ear-shaped or triangular as in other subgenera of Andrena but are distinct nonetheless. The female of rubrotincta can be told from the other species with pronotal humeral angles by the black vestiture and the mesoscutum being dulled by shagreening. The male of rubrotincta differs from other members of this group by the lack of a subapical mandibular tooth and the mesoscutum being shagreened.
FEMALE: MEASUREMENTS AND RATIOS. — N = 20; length, 11-13 mm; wing length, 3-4 mm; WL, M = 4.48 ± 0.166 mm; FL/FW, M = 1.04 ± 0.006; FOVL/FOVW, M = 3.04 ± 0.052.
DIAGNOSIS. — Vestiture dark reddish brown to dark brown; wing membranes hyaline, not at all infumate, veins dark red to dark reddish brown; metasomal terga piceous, without metallic reflections. Galeae as in oenotherae; labral process large, triangular with blunt tip, often slightly emarginate apically, sides usually straight, rarely concave (Fig. 20); vertex above lateral ocellus short, equals about half an ocellar diameter. Clypeus with small round punctures separated mostly by half a puncture width or slightly more, with narrow median impunctate line. Vertex above lateral ocellus equals about half an ocellar diameter; ocelli not enlarged. Pronotum with distinct humeral angle and dorsoventral ridge laterally (Fig. 18). Mesoscutum with small round punctures separated mostly by half a puncture width or more, surface dulled by fine reticular shagreening; scutellum similar but punctures slightly denser. Propodeum with dorsal surface distinct, dorsal enclosure weakly sculptured. Finely tessellate; surface outside of enclosure not punctatorugose, with scattered obscure punctures and fine reticular shagreening dulling surface; 7.-A with apical areas punctate except narrow rim, punctures separated mostly by one to three puncture widths, basal areas with punctures separated mostly by one to two puncture widths, surfaces shiny. Thoracic dorsum with hairs longer than width of scape; propodeum without distinct corbicula laterally, hairs long and plumose; tibial scopal hairs long, simple, sparse, scarcely hiding surface.
MALE: MEASUREMENTS AND RATIOS. — N = 20; length. 9-11 mm; width, 2.0-2.5 mm; WL, M = 3.7410.173 mm; FL/FW, M = 1.06 ± 0.005; FS1/FS2, M = 1.32 ± 0.022
DIAGNOSIS. — Vestiture pale, white to pale ochraceous, except on vertex and along inner margins of eyes usually brown; wings hyaline, slightly infumate apically, veins dark reddish brown to black; metasomal terga black or piceous, without metallic reflections. Galeae as in oenotherae; labral process large, trapezoidal with median emargination (not strongly bidentate), curved but not strongly reflexed; mandibles decussate, without subapical tooth (Fig. 17). Clypeus with punctures small, irregularly separated by half to one puncture width, usually with median impunctate line, shiny; vertex above lateral ocellus equals less than one ocellar diameter and usually slightly more than half an ocellar diameter: genal area twice as broad as eye in profile; flagellar segment 1 equal to or slightly longer than segment 3, distinctly longer than 2. Pronotum as in female (Fig. 19). Mesoscutum and scutellum as in female but punctures slightly sparser and surface often slightly shiny, shagreening delicate but present; propodeum and mesepisternum sculptured as in female but propodeum with dorsal enclosure slightly more coarsely rugulate. Terga 2-5 with apical areas as in female terga 2-4 but punctures smaller and slightly sparser; basal areas similar to female. Metasomal tergum 2 with basal area hairs short, mediobasally less than half as long as those of tergum 1; hind tibiae with outer surface hairs long, sparse, along anterior margin some almost as long as dorsal femoral hairs. Sternum 7 similar to that of vanduzeei, vestiture sparse, weak; sternum 8 with apex broad, gently emarginate, neck region strongly hairy (Figs. 59 and 60).
TYPE MATERIAL. — The holotype female (CAS No. 4.235) of Andrena (O.) rubrotincta was collected from the Colorado Desert near Needles, . San Bernardino Co., California, March 6, 1930, by E.G. Linsley.
DISTRIBUTION. — Andrena rubrotincta is known from southern California, Nevada, and western Arizona (Linsley, MacSwain, and Raven, 1963, p. 17) (Fig. 6). We also have seen a specimen from Utah. It has been collected from February 1 through May 9 but chiefly in March and April. In addition to the holotype. a total of 78 females and 26 males were examined from localities listed below.
ARIZONA. MOJAVE CO.: Cane Springs; Havasu City; Kingman (8 mi. N and 32 mi. NW); Topock. CALIFORNIA. IMPERIAL CO.: Coyote Wells (6 mi. W); Painted Canyon (4.6 mi. NE Mecca). KERN CO.: Short Canyon (6 and 6.5 mi. NW Inyokern): Walker Pass (1 mi. W). RIVERSIDE CO.: Boyd Desert Research Center (4 mi. S. Palm Desert); Coyote Creek; Deep Canyon Recreation Area; Desert Center (4 mi. E): Desert Hot Springs (4.5 mi. NW); Elsinore (4 mi. E); Indio; Joshua Tree Natl. Mon.; La Quinta; Palm Desert; Thousand Palms. SAN BERNARDINO CO.: Kelso (7 mi. S in Providence Mountains); Needles (near, 9 mi. S and 15 mi. SE). SAN DIEGO CO.: Borrego; Jacumba (5 mi. E). NEVADA. CLARK CO.: Glendale (and 1.6 mi. E and 6 mi. NE); Mesquite (4 mi. W); Mormon Mesa; Overton. UTAH. WASHINGTON CO.: Virgin (3 mi. W).
FLORAL RECORDS. — Andrena (A.) rubrotincta is an oligolege of plants of the genus Camissonia (as Oenothera in earlier publications) and has been collected from flowers of the plants listed below.
Baileya sp., Camissonia sp., Camissonia b. brevipes, C. b. pallidula, C. claviformis, C. c. aurantiaca, C. (as Oenothera) parryi, Hyptis emoryi, Lesquerella sp., Oenothera sp., Phoradendron californicum, Salix sp., Tamarix gallica.
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References |
Andrena rubrotincta Linsley, 1938, Proc. California Acad. Sci., ser. 4, 23: 266, 278-279.
Andrena (Melandrena) rubrotincta: Lanham, 1949, Univ. California Publ. Ent., 8: 321; Linsley and MacSwain, 1955, Pan-Pacific Ent., 31: 165, 170; Linsley, MacSwain, and Smith, 1955, Pan-Pacific Ent, 31: 176.
Andrena (Onagrandrena) rubrotincta: Linsley and MacSwain, 1956, Pan-Pacific Ent., 32: 112; Linsley and MacSwain, 1961, Pan-Pacific Ent., 37: 128; Linsley, MacSwain, and Raven, 1963, Univ. California Publ. Ent., 33: 16-18.
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Updated: 2024-04-24 21:59:33 gmt
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