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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Andrena ardis is a medium-sized bee closely related to A, neomexicana and A. isocomae which it resembles in the form of the female facial foveae and the male parocular maculae. The female of ardis can be distinguished from that neomexicana by its slightly larger size and by the facial fovea being separated from the lateral ocellus by nearly the diameter of one ocellus. The male of ardis can be distinguished from that of neomexicana by its larger size, darker vestiture and yellow facial markings. Both ardis and neomexicana differ from isocomae in the pale basitarsi and hind tibiae.
FEMALE. MEASUREMENTS AND RATIOS. — N = 7; length, 10-12 mm; width, 3.0-3.5 mm; wing length, M = 3.48 ± 0.329 mm; FL/FW, M = 1.00 ± 0.027; FOVL/FOVW, M = 2.45 ± 0.097.
INTEGUMENTAL COLOR. — Black except as follows: mandible with apical half or more rufescent; flagellum dark reddish-brown below; tegulae testaceous, red 10 reddish-brown; wing membranes hyaline, veins orange to red; terga 1-4 hyaline apically, often narrowly rufescent adjacent to hyaline apex; sterna 2-5 narrowly hyaline apically, dark rufescent basally; distitarsi rufescent; hind basitarsi orange to red; hind tibiae orange to red.
STRUCTURE. — Antennae short; scape length equals first three and three-fourths flagellar segments; flagellar segment 1 equal in length to segments 2 plus 3 or slightly longer; segments 2 and 3 subequal in length; segment 3 shorter than 4; segments 2-8 broader than long; segment 9 quadrate; segment 10 longer than broad. Eye about four times as long as broad, inner margins converging towards mandibles. Malar space, mandible and galea as in gardineri. Maxillary palpus as in gardineri but segmental ratio about 0.8:1.0:0.6:0.6:0.5:0.8. Labial palpus as in gardineri but segmental ratio about 1.7:1.0:0.6:0.7. Labral process as in gardineri. Clypeus evenly rounded, flatter than in gardineri, protruding beyond ends compound eyes by one-third its median length or less; punctures round, coarser medially, separated by one-half to one puncture width, surface shiny medially, dulled by coarse reticular shagreening peripherally, shagreening may cover clypeus (not in holotype) but surface remains at least moderately shiny medially. Supraclypeal area with minute crowded punctures, surface shiny, unshagreened or delicately so. Genal area as in gardineri but surface unshagreened and punctures separated mostly by one-half to one puncture width posteriorly. Vertex above lateral ocellus equals one and one-third to one and one-half ocellar diameters; punctures crowded medially above ocelli, sparse laterally except crowded in narrow band adjacent to upper margins of facial foveae, surface moderately shiny, reticularly shagreened. Face above antennal fossae with weak, irregular, longitudinal rugulae and coarse, crowded punctures, surface dulled by line shagreening. Facial fovea long and broad as in isocomae except separated from lateral ocellus by at least three-fourths of one ocellar diameter.
Pronotum normal, as in gardineri but shinier, shagreening more delicate. Mesoscutum with moderately large, round punctures separated mostly by less than one puncture width except in small posteromedian area where separated by two to four puncture widths, surface shiny posteromedially, moderately dulled by reticular shagreening elsewhere; parapsidal line as in gardineri. Tegulae normal, impunctate. Scutellum as in mesoscutum but shinier. Metanotum opaque, dulled by small crowded punctures and tessellation. Propodeum as in isocomae except as follows: dorsal enclosure occasionally without median roughening (holotype), corbicular area with punctures crowded in anterodorsal third, scattered elsewhere. Mesepisternum as in gardineri but punctures shallow. Metepisternum as in gardineri but lower two-thirds with minute round punctures separated mostly by one to two puncture widths, surface shiny. Middle basitarsus as in gardineri but distinctly broader than hind basitarsus. Wing venation as in gardineri.
Metasomal terga 1-4 with narrow apical margins impunctate, surfaces shiny, unshagreened or delicately so. Tergum 1 with apical third (except narrow margin) with moderate-sized, round, crowded punctures, basally with smaller punctures separated mostly by one puncture width or slightly more. Terga 2-4 with basal area punctures separated mostly by less than one puncture width and more crowded adjacent to narrow apical margins. Pygidial plate V-shaped with apex not rounded (unless eroded), internal raised triangle absent. Sterna 2-5 with apical hyaline margins impunctate, basal areas with crowded punctures of moderate size separated mostly by one-half to one puncture width except on sternum 2 where sparser, surfaces moderately shiny, reticularly shagreened.
VESTITURE. — Generally as in gardineri but usually paler and propodeal corbicular internal hairs plumose throughout.
MALE. MEASUREMENTS AND RATIOS. — N=5; length, 9-11 mm; width, 2-3 mm; wing length, M = 3.22 ± 0.356 mm; FL/FW, M= 1.10 ±0.023; FS1/FS2, M = 2.09 ±0.051.
INTEGUMENTAL COLOR. — As in gardineri with the following differences: parocular yellow areas large, extend upward to level of lower margins antennal fossae or almost so; supraclypeal area often with median yellow macula (not in allotype); tegulae brown to red; wing veins orange to red; basitarsi yellow to orange; hind tibiae orange to red.
STRUCTURE. — Antennae short, not surpassing tegulae in repose; scape length equals flagellar segments 1-3; flagellar segments as in isocomae. Eye, malar space, mandible and galea as in gardineri. Maxillary palpus as in gardineri but segmental ratio about 0.9:1.0:0.6:0.6:0.5:0.6. Labial palpus as in gardineri but segmental ratio about 2.0:1.0:0.8:1.0. Labral process as in female but teeth usually somewhat blunted. Clypeus, supraclypeal area, genal area, vertex and face as in female.
Thorax as in female with the following differences: propodeal dorsal enclosure roughened medially; propodeal lateral areas with punctures more abundant, surface moderately dulled by reticular shagreening; mesepisternum with punctures deep. Tegulae normal, impunctate. Wing venation as in female. Terga sculptured as in female except as follows: terga 1-5 like female terga 1-4; terga 1 and 2 with basal area punctures slightly sparser. Sterna 2-5 as in female. Sternum 6 with apical margin reflexed as in gardineri.
Genitalia and sterna 7 and 8 (Figs. 277-281) similar to those of isocomae but note shape of inner-dorsal ridge of gonoforceps and sternum 8.
VESTITURE. — Generally white to pale ochraceous and as in female except as follows: terga 1-5 with distinct pale apical fasciae as in female terga 1-4; sterna 2-5 with subapical fimbriae of moderately long, pale ochraceous, straight, suberect hairs; fimbriae less distinct from more basal hairs than in gardineri, isocomae or neomexicana; inner surfaces tarsi pale yellow.
TYPE MATERIAL. — The holotype (UCB) female and the allotype (UCB) male from seven and one-half miles south of Three Rivers, Otero County, New Mexico, were collected by P. D. Hurd, September 9, 1961, on Gutierrezia microcephala. One male paratype (UCB) was taken with the holotype and allotype. In addition six female and three male paratypes (UCB; UAT; NSM; MSU; INHS) are as follows: COLORADO: Limon, 1 female, August 29, 1951, R. R. Dreisbach. NEBRASKA: Crawford (5 miles N.), 1 male, August 30, 1959, Chrysothamnus nauseosus, W. E. LaBerge. NEW MEXICO: Carlsbad (5 miles E.), 4 females, September 21, 1956, on Chrysothamnus sp., . W. MacSwain; Carrizozo, 2 males, September 10, 1961, on Gutierrezia microcephala, P. D. Hurd. TEXAS: McNary, 1 female, September 27, 1957, on G. sarothrae, W. Nutting and F. G. Werner.
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