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Andrena nevadae Linsley & MacSwain, 1961
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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Andrena nevadae is a large black bee known from only the female holotype and one female paratype collected in Nevada. These bees have long, simple, sparse scopal hairs similar to those of Andrena linsleyi Timberlake. However, nevadae can be separated from linsleyi by the shiny mesoscutum and scutellum and by the more coarsely sculptured propodeum. The female of nevadae is readily separated from the female of deserticola by the sparse scopal hairs and coarsely sculptured propodeum.

FEMALE: MEASUREMENTS AND RATIOS. N = 1; length, about 13 mm; width, about 4 mm; WL, 4.94 mm; FL/FW, 1.04; FOVL/FOVW, 3.00.

DIAGNOSIS. Vestiture entirely black; wing membranes hyaline, slightly infumate apically, veins dark reddish brown to black; metasomal terga black without metallic reflections. Galeae as in anograe, labral process triangular, with straight sides, apex thickened to form small knob. Clypeus and vertex as in deserticola. Pronotum without humeral angle or vertical ridge laterally. Mesoscutum and scutellum sculptured as in deserticola, shiny. Propodeum (Fig. 16) with dorsal enclosure coarsely rugulate, surface outside of enclosure (Fig. 16) moderately coarsely punctatorugose, dulled by fine shagreening. Mesepisterna punctatorugose, surface dulled by shagreening. Metasomal terga 2-4 with apical areas punctate in basal two-thirds, punctures separated by half to one puncture width or slightly more; basal areas with punctures separated mostly by one lo two puncture widths; surfaces shiny, shagreening sparse and delicate or absent. Thoracic dorsum with hairs long, much longer than width of antennal scape; propodeum without corbicula laterally, hairs all long ; md plumose; scopal hairs very long, simple, extremely sparse, not at all hiding surface of tibia.

TYPE MATERIAL. The holotype female (CAS No. 6,705) of nevadae was collected 1.8 miles west of Pancake Summit, White Pine County, Nevada, June 24, 1959, at flowers of Camissonia (as Oenothera) claviformis integrior by J. W. MacSwain. A female paratype was collected from 28.5 miles west of Eureka, Eureka County, Nevada, June 8, 1960, at flowers of Stanleya pinnata by. MacSwain (Fig. 2).

Female.- Integument black; pubescence black. Head with clypeus shining, discal punctures mostly separated by one or more diameters; labrum with produced apex of process tumid, not longer than broad; antennae with first flagellar segment, measured along anterior margin, a little shorter than second and third segments combined. Mesosoma with mesoscutum slightly shining, surface between punctures very finely and obscurely reticulate, most discal punctures separated by less than one diameter, pubescence moderately long, erect, not obscuring surface; mesoscutellum more densely punctate; propodeum coarsely rugoso-punctate, basal enclosure somewhat irregularly rugose, but with median longitudinal ridge and an anterior ridge curving in toward it from the base on each side, peripheral ridges short, oblique; wings tinted with blackish; legs with scopae of posterior tibiae very long (almost twice width of tibiae), thin and loose. Metasoma moderately robust, apical impression of first tergum more densely punctate than disk, the punctures subequal in size, terga of metasomal segments two to four uniformly punctate except for a very narrow posterior margin in apical impression, pubescence long, plumose throughout, appressed dorsally, suberect laterally, the longest hairs on second tergum nearly one-third as long as segment. Length approx. 14.5mm., anterior wing 10.5mm.

Male. UNKNOWN Holotype female (California Acad. of Sci. Ent.), from 18 miles W of Pancake Summit, White Pine Co., Nevada, June 24 1959, at flowers of Oenothera clavaeformis integrior; and one paratype female (Calif. Insect Survey, University of California, Berkeley), from 28.5 miles west of Eureka county, Nevada, visiting flowers of Stanleya pinnata (without pollen) between 7:27 and 7:30 am (J.W. MacSwain).

This species may be compared with A. oenotherae but differs from it in the sculpturing of the propodeal enclosure, more shining mesoscutum, much larger tibial scopa which is about twice as wide as the tibia, and the very long abdominal pubescence. It is more closely related to A. anograe, but may be distinguished by more shining mesoscutum and the absence of pale thoracic hairs. Like anograe and linsleyi it has a long thin scopa and is presumably associated with one of the large, white evening primroses of the subgenus, Pachylophis or Anogra.

Scientific source:

Andrena (Onagrandrena) nevadae Linsley and MacSwain, 1961, Pan-Pacific Ent., 37: 125-126; Linsley, MacSwain, and Raven, 196, Univ. California Publ. Ent., 33: 31, 39.

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