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© Copyright John Ascher, 2006-2014
· 6
Andrena argemonis, prickly poppy bee |
© Copyright John Ascher, 2006-2014
· 6
Andrena argemonis |
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Smithsonian Institution, Entomology Department · 1
Andrena argemonis, face |
Smithsonian Institution, Entomology Department · 1
Andrena argemonis, side |
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Smithsonian Institution, Entomology Department · 1
Andrena argemonis, top |
Smithsonian Institution, Entomology Department · 1
Andrena argemonis, wing |
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Overview |
Reprinted with permission of the American Entomological Society from:
LaBerge, W. E. 1969. A revision of the bees of the genus Andrena of the Western Hemisphere. Part II. Plastandrena, Aporandrena, Charitandrena. Transactions of the American Entomological Society 95: 1-47.
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This the largest species of North American Plastandrena and one of our largest Andrena. The female can be readily separated from any other species of Plastandrena by the hind femur having a distinct but incomplete posteroventral carina extending basad from the posterior tibiofemoral articulation but not reaching the trochanter. The male has unusually large terminalia with especially enlarged gonobase and base of the gonocoxite. Also, the male can be recognized by the black or red (not yellow) clypeus and the broad opening between the sixth sternum and the last tergum. Both sexes have a considerable amount of the integument reddened in many specimens and the tarsi and tibiae are usually red.
FEMALE. MEASUREMENTS AND RATIOS. — N = 20; length, 14-16 mm; width, 3.5-5.0 mm; wing length, M = 5.47 ± 0.751 mm; FL/FW, M = 0.95 ± 0.052; FOVL/FOVW, M = 3.09 ± 0.054.
INTEGUMENTAL COLOR. — Black except as follows: mandibles often rufescent basally; clypeus occasionally somewhat reddened peripherally; first flagellar segment often reddened below at base; tegulae testaceous; wing membranes infumate in apical half, often with marginal cell almost black, veins reddish-brown to black; dorsal enclosure of propodeum often reddened in pan; terga vary from black with hyaline, clear to yellow apices, to entirely red with yellowish apices; sterna usually red; tibiae usually red or brownish-red, tarsi brown to brownish-red.
STRUCTURE. — Scape equal in length to flagellar segments 1 to 3 plus three-fourths of 4; flagellar segment 1 twice as long as 2 or slightly longer, 2 equals 3 and shorter than 4. Eye, malar space, mandible and galea as in crataegi, maxillary palpus as in crataegi but segmental ratio about 0.9: 1.0: 0.7: 0.6: 0.6: 0.7. Labial palpus as in crataegi but segmental ratio about 1.1: 0.6: 0.5: 0.6. Labral process rather long, usually about two-thirds as long as width at base, entire or weakly emarginate at tip; apical area flat, shiny or weakly shagreened, without crista, Clypeus sculptured as in crataegi but surface shiny, without shagreening peripherally and punctures somewhat more regular and crowded. Supraclypeal and genal areas as in crataegi. Vertex above lateral ocellus equals distinctly more than one ocellar diameter to about one and one-half diameters, moderately shiny. Face above antennal fossae as in crataegi. Facial fovea as in crataegi but separated from lateral ocellus by more than half an ocellar diameter, usually three-fourths to one diameter.
Pronotum, mesoscutum, scutellum and metanotum as in crataegi but mesoscutum usually without shagreening except at extreme periphery and then fine. Propodeum with dorsal enclosure distinctly set-off from posterior surface by a strong, subcarinate ruga, interior with irregular rugulae and fine tessellation; dorsolateral and posterior surfaces with fine, sparse punctures and dulled by fine dense tessellation; corbicular area with small sparse punctures, no rugulae, moderately dulled by coarse tessellation. Mesepisternum with distinct round punctures separated by half to one puncture width, interpunctural surfaces dulled by fine tessellation. Metepisternum similar but almost impunctate in lower two-thirds. Hind femur with posteroventral surface with a subcarinate ridge extending from posterior tibiofemoral articulation half to two-thirds length of femur towards base. Pterostigma slender, not as broad as from inner margin prestigma to wing margin; venation as in crataegi
Terga 1-5 as in crataegi but base of tergum 1 with punctures almost as crowded as in basal areas of terga 2-4, basal areas without lateral areas of sparser punctures and apical areas more deeply impressed. Pygidial plate V-shaped, without distinct internal raised triangle. Sterna as in crataegi but punctures smaller and more crowded.
VESTITURE. — Generally pale ochraceous or cinereous with darker ochraceous on vertex of head and thoracic dorsum. Mesoscutum with posteromedian area and scutellum medially with hairs sparse or absent; mesoscutal and scutellar hairs either short and appressed or moderately short and erect. Terga 1-5 with distinct apical fasciae of light, short, subappressed pubescence, weak on terga 1 and 2. Sterna with apical fimbriae weak. Legs with inner surfaces tarsi pale yellow. Pollen collecting hairs as in crataegi.
MALE. MEASUREMENTS AND RATIOS. — N = 20; length, 14-16 mm; width, 3.4 mm; wing length. M = 5.67 ± 0.152 mm; FL/FW, M = 1.03 ± 0.077; FS1/FS2, M = 1.91 ± 0.034.
INTEGUMENTAL COLOR. — Black except as follows; base of mandibles rarely red: clypeus, supraclypeal area and flagellar segment 1 occasionally red at least in part (never yellow); dorsal enclosure propodeum occasionally red; terga rarely entirely red except small maculae laterally on tergum 2, often entirely dark except hyaline apical areas, usually somewhere between these extremes; sterna usually all or mostly red; legs with at least tibiae and tarsi red (occasionally tarsi dark reddish-brown), rarely femora red; wings as in female.
STRUCTURE. — Antennae short, in repose not reaching beyond tegulae; scape equal in length to about first two and three-fourth flagellar segments; segment 1 slightly shorter than segments 2 plus 3, 2 slightly shorter than 3, 4-11 less than one and one-half times as long as broad, usually barely longer than broad. Eye, malar space, mandible and galea as in crataegi. Maxillary palpus as in crataegi but segmental ratio about 1.0: 1.0: 0.7: 0.7: 0.5: 0.7. Labial palpus as in crataegi but segmental ratio about 1.0: 0.7: 0.5: 0.6. Labral process as in female but usually emarginate; apical area shiny, without crista. Clypeal punctures crowded, usually without median impunctate line. Supraclypeal area, genal area, vertex, face above antennal fossae as in female.
Thorax as in female but propodeal dorsal enclosure often not marked off posteriorly by a distinct ruga and lateral surfaces with more abundant punctures. Venation and pterostigma as in female. Hind femur without posteroventral carina.
Terga sculptured as in female. Sterna 2-5 with basal area punctures small, separated mostly by two to four puncture widths, surface moderately shiny, shagreened; sternum 6 flat with extremely broad V-shaped apical emargination, open more widely than in crataegi or prunorum.
Terminalia (Figs. 24-28) marked by large size. Note the following: gonobase equals two-fifths length of entire genital capsule; gonostyle and penis valves short; penis valves with slender tips and greatly inflated dorsally surrounding aedeagal opening; sternum 7 transverse, weakly haired; sternum 8 with apex not expanded, strongly curved at base so that in dorsal view appearing broadly emarginate at base.
VESTITURE. — Much as in female except lacking pollen-collecting hairs and thoracic dorsum with hairs often darker ochraceous and somewhat more abundant.
Geographical VARIATION. — A curious example of geographical variation exists in A. argemonis. Specimens from the United States all have the mesoscutal and scutellar hairs very short and closely appressed in the females and somewhat less so in the males. All specimens from Mexico have longer, erect dorsal thoracic vestiture. At first, the author was inclined to consider this a specific difference, but no structural characters of male terminalia or integument of either sex correlates with the hair pattern. Also, relatively few specimens are known from critical areas of northern Chihuahua, Coahuila and Sonora where intergrades may be expected to occur. In addition, this same variation in hair type occurs in the females of A. prunorum but it is not distributed geographically, the short appressed hairs appearing in individuals from throughout its range.
Specimens from Mexico tend to be slightly darker in color than those from the United States. This, together with the distribution of thoracic hair types, could be sufficient to recognize a southern race of argemonis.
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Updated: 2024-04-25 16:28:41 gmt
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