Reprinted with permission of the University of Nebraska State Museum from:|
LaBerge, W. E. 1967. A revision of the bees of the genus Andrena of the Western Hemisphere. Part I. Callandrena (Hymenoptera: Andrenidae). Bulletin of the University of Nebraska State Museum 7: 1-316.
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This species is known only in the female sex. The females of beameri are very similar to and this species is closely related to A. irrasus. The female of beameri can be told from that of irrasus by the mesoscutal punctures being more abundant, the posterior surface of the propodeum with sparser punctures, and the metasomal terga being dulled, more coarsely tessellate. A. beameri also closely resembles A. rudbeckiae rather closely. The female of beameri differs from that of rudbeckiae by the tergal punctation being much sparser.
FEMALE. MEASUREMENTS AND RATIOS. — N = 16; length, 11.0-13.0 mm; width, 2.5-3.5 mm; wing length, M = 4.05 ± 0.177 mm; FL/FW, M = 1.05 ± 0.005; FOVL/FOVW, M = 2.61 ± 0.036.
INTEGUMENTAL COLOR. — Black except as follows: lower surfaces flagellar segments 4-10 slightly reddened; mandibles with apical halves rufescent; tegulae testaceous, yellowish; wing membranes slightly infumate, especially apically, veins dark reddish-brown; terga 1-4 narrowly hyaline apically, reddened in narrow zone basad of hyaline area; sterna hyaline apically; distitarsi rufescent.
STRUCTURE. — Scape equal to flagellar segments 1-4 or slightly shorter; flagellar segment 1 equal in length to succeeding 2 and 1/2 segments, segment 2 equals segment 3, segments 2 and 3 equal to or extremely slightly shorter than segment 4. Eye about three and one-third times as long as broad, inner margins converging slightly toward mandibles. Malar space, mandibles, and galea as in irrasus. Maxillary palpus as in irrasus but segments in ratio of about 1.3:1.5:1.0:1.0:0.6:0.8. Labial palpus as in irrasus but segments in ratio of about 2.1:1.0:0.6:0.7. Labral process bidentate. Clypeus evenly rounded, protruding beyond ends of eyes by slightly less than half median length, with round deep punctures separated mostly by half a puncture width or slightly more, without distinct longitudinal median impunctate area, surface moderately dulled by reticular shagreening. Supraclypeal area with minute crowded punctures and minute longitudinal rugulae, moderately dulled by fine irregular shagreening. Genal area slightly broader than eye in profile, with minute crowded punctures near eye margin separated mostly by one-half puncture width or slightly more, posteriorly punctures slightly larger and sparser, surface dulled by reticular shagreening. Vertex above lateral ocellus equals about one and one-half ocellar diameter, with small punctures crowded above median ocellus, sparse laterally except very crowded just above facial foveae, surface dulled by tessellation. Face above antennal fossae with longitudinal rugulae not quite or barely reaching ocelli, not extending above facial foveae laterally, interrugal spaces punctate, moderately dulled by reticular shagreening. Facial fovea extends down 10 about middle of antennal fossa, upper end rounded, separated from lateral ocellus by one ocellar diameter or slightly less, narrowed and rounded below.
Pronotum normal, will) small round punctures dorsally separated mostly by half to one puncture width, sparser laterally, dulled by coarse reticular shagreening. Mesoscutum, scutellum and metanotum with round punctures separated mostly by half to one puncture width, slightly sparser medially on mesoscutum and scutellum, surfaces dulled by fine tessellation. Propodeum with enclosure with short fine longitudinal rugulae basally, elsewhere coarsely punctate to very finely areolate; dorsolateral surface with round punctures separated by half to one puncture width, surface tessellate; posterior surface with similar punctures separated by one to two puncture widths or more, surface tessellate; corbicular area with scattered punctures throughout, surface moderately shiny, coarsely shagreened. Mesepisternum sculptured like posterior propodeal surface. Metepisternum sculptured like corbicular area but without punctures. Wing venation as in helianthi except vein 1st m-cu meets second submarginal cell at or slightly beyond middle of cell. Middle basitarsus as in irrasus. 1 tibial spurs and claws normal.
Metasomal terga sculptured as in irrasus except tessellation somewhat deeper making surfaces opaque. Pygidial plate V-shaped with rounded apex. Sterna sculptured as in irrasus.
VESTITURE. — In general vestiture as in irrasus except tergum 2 with apical pale band uninterrupted medially, propodeal corbicula with long simple Internal hairs throughout; trochanteral flocculus complete, weak; tibial scopal hairs plumose throughout but rather weakly.
TYPE MATERIAL. — Holotype female (SECK) from 8 miles southwest of Ottawa, Kansas, June 6, 1950, was collected by C. 1). Michener. Fifteen female paratypes (SECK; INHS; MSU; KSLJ; USNM) are as follows: Baxter Springs, Kansas: 7 females, June 12, 1951, Roland L. Fischer; 1 female, June 12, 1951, C. D. Michener and R. L. Fischer, on Coreopsis grandiflora; 2 females, June 26, 1951, C. D. Michener, on Helenium nudaflora; 1 female, June 26, 1951, C. D. Michener, on Echinacea augustifolia. Boles, Arkansas: 2 females, May 27, 1950, R. H. Beamer. Washington County, Arkansas: 2 females, June 12, 1951, P. Boles. This species is named A. beameri in honor of the late R. H. Beamer of the University of Kansas.