Smithsonian Institution, Entomology Department · 9
Andrena trevoris, male, face |
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Smithsonian Institution, Entomology Department · 9
Andrena trevoris, male, genitalia |
Smithsonian Institution, Entomology Department · 9
Andrena trevoris, male, side |
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Smithsonian Institution, Entomology Department · 9
Andrena trevoris, male, top |
Smithsonian Institution, Entomology Department · 9
Andrena trevoris, male, wing |
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© Copyright Laurence Packer 2014
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Andrena trevoris FEM CFP comp |
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Overview |
Reprinted with permission of the American Entomological Society from:
LaBerge, W. E., Ribble, D. W. 1972. A revision of the bees of the genus Andrena of the Western Hemisphere. Part V: Gonandrena, Geissandrena, Parandrena, Pelicandrena. Transactions of the American Entomological Society 98: 271-358.
Please report text errors to: leah at discoverlife dot org.
This remarkable species from the west can be distinguished by the subgeneric characters given above. Both sexes are distinctive in the high hypostomal carina. The female has moderately plumose scopal hairs and the male has a yellow clypeus.
FEMALE. MEASUREMENTS AND RATIOS: N = 20; length, 8-11 mm; width, 2-3 mm; wing length, M = 3.49 ± 0.193 mm; FL/FW, M = 1.09 ± 0.005; FOVL/FOVW, M = 3.70 ± 0.043.
INTEGUMENTAL COLOR. Black except as follows: mandible with apical half rufescent; flagellum reddish-brown to dark brown below; wing membranes hyaline, colorless to slightly infumate, veins red to reddish-brown; tegulae rufescent; terga and sterna with apical areas rufescent, translucent; tarsi and often tibiae and femora dark rufescent; tibial spurs yellow.
STRUCTURE. Antennal scape length equal to slightly less than first four flagellar segments; flagellar segment 1 slightly longer than segments 2 plus 3; segment 2 about as long as 3, each broader than long; segments 4 and 5 quadrate, remaining segments longer than broad. Eyes each three and one-half times as long as broad or slightly longer, inner margins parallel. Malar space short. Mandible when closed surpassing middle of labrum by about one-fifth length. Labial palpus with first segment strongly curved, slightly flattened apically, ratio about as 1.0:0.7:0.6:0.6. Maxillary palpus long, exceeding galea by last two and one-half segments when extended, ratio about as 0.6:1.0:0.7:0.7:0.6:0.6 (note length of segment 2 relative to segment 1). Labral process small, trapezoidal with apex emarginate, thickened apically; labrum below process short, not sulcate, shiny. Clypeus slightly flattened apicomedially, with well-formed, long, apical margin; surface with large, irregular-sized punctures separated by one-half to one puncture width except along slightly raised, impunctate midline; shiny, with faint reticular shagreening especially basally. Supraclypeal area with minute close-set punctures dulling surface. Face above antennal fossae with close-set longitudinal rugulae and abundant interrugal punctures dulling surface. Facial fovea narrow, extending down to just below level of lower margins antennal fossae, separated from lateral ocellus by one ocellar diameter. Vertex above lateral ocellus equals one ocellar diameter or slightly less, surface punctate and tessellate, dull. Genal area moderately broad, about one and one-fourth times as broad as eye in profile, surface shiny with small punctures widely separated except near eye margin, slightly shagreened posteriorly.
Pronotum with ridge extending down from humeral angle poorly formed, rounded, surface dulled by dense reticular shagreening, with scattered minute punctures. Mesoscutum with small round punctures, anteriorly and laterally separated mostly by one puncture width or less, posteromedially by two or three puncture widths, surface shiny, with reticular shagreening especially peripherally but scarcely dulling surface. Scutellum similar but punctures sparse and shagreening absent except on extreme periphery. Propodeum with dorsal enclosure triangular, granular but not rugulose, tessellate; dorsolateral and posterior surfaces dulled by close-set shallow punctures obscured by dense tessellation; corbicular surface moderately shiny, with coarse reticular shagreening and small scattered punctures (especially dorsally). Mesepisternum with distinct, round, shallow punctures somewhat obscured by dense reticular shagreening. Wing with pterostigma large; vein 1st m-cu meets second submarginal cell at or near outer third of cell. Tibial spurs normal.
Metasomal tergum 1 with basal area with small round punctures separated mostly by two to three puncture widths, apical area with apical half impunctate, basal half with small round crowded punctures, surface shiny, unshagreened or delicately so. Terga 2-4 similar but basal area punctures more crowded and apical area with impunctate rim no more than one-third length of area. Pygidial plate V-shaped, narrow, with raised internal triangular area. Sterna impunctate in basal two-fifths and in narrow apical areas, otherwise with small punctures separated by one-half to one puncture width or more, surfaces moderately dulled by reticular shagreening.
VESTITURE. Generally ochraceous, often fox-red on vertex and thoracic dorsum. Thoracic dorsum with hairs highly plumose, moderately short, thick-set; corbicula often with plumose hairs along anterior margin but these shorter than dorsal fringe, internal hairs long, sparse, plumose; trochanteral flocculus complete; scopal hairs weakly plumose throughout. Metasomal tergum 1 with pale apical fascia broadly interrupted medially; tergum 2 with broad apical pale fascia usually narrowly interrupted medially; terga 3 and 4 with broad apical fasciae usually complete; sterna without subapical fimbriae.
MALE. MEASUREMENTS AND RATIOS: N = 20; length, 8-11 mm; width, 1.5-3.0 mm; wing length, M = 3.15 ± 0.163 mm; FL/FW, M = 1.13 ± 0.008; FS1/FS2, M = 1.45 ± 0.028.
INTEGUMENTAL COLOR. Black except as follows: Mandible with apical half to one-third rufescent; clypeus bright yellow except broad apical margin and two maculae below tentorial pits; parocular areas often with small yellow maculae; flagellum reddish-brown to dark brown below; wing membranes hyaline, veins red to reddish-brown; terga 1-5 with apical areas hyaline, colorless apically to rufescent basally; tarsi rufescent; tibial spurs yellow.
STRUCTURE. Antenna moderately long, reaching metanotum in repose; scape length equal to slightly more than first two flagellar segments; flagellar segment 1 about equal to segment 3, longer than 2, all segments longer than broad (or rarely segment 2 quadrate). Eyes each about three and one-half times longer than broad or slightly shorter, inner margins slightly converging towards mandibles. Malar space and galea as in female. Mandible as in female but slightly longer. Labial palpus as in female but ratio about as 1.0:0.5:0.5:0.6. Maxillary palpus as in female but ratio about as 0.6:1.0:0.9:0.6:0.6:0.6. Labral process short, bidentate, moderately reflexed; labrum below process as in female. Clypeus rounded from side to side except flattened medially just above exceptionally long, entire, apical margin; punctures irregular, separated by half to one puncture width or more, usually without median impunctate line, surface shiny. Supraclypeal area, face above antennal fossa and vertex as in female. Genal area moderately broad, in profile about one and one-third times as broad as eye or slightly broader, without angular area below and not carinate posteriorly; surface shiny, with minute scattered punctures, unshagreened or only delicately so.
Pronotum with rather rounded but distinct dorsoventral ridge extending down from humeral angle, area above oblique pronotal suture with several fine rugulae paralleling ridge posterior to ridge; surface dulled by fine reticular shagreening and sparse punctures. Mesoscutum and scutellum as in female but punctures slightly sparser. Propodeum as in female but lateral surfaces dulled by more abundant punctures. Mesepisternum, wing venation and tibial spurs as in female.
Metasomal terga 1-5 sculptured as in female terga 2-4 but basal area punctures usually smaller (often minute) and sparser. Sterna 2-5 with basal area punctures minute and sparse except along a narrow band at base of apical areas, surfaces shiny, delicately shagreened. Sternum 6 entire apically, unreflexed. Terminalia as figured (Figs. 36-40); note the following: penis valves narrow with narrow lateral lamellae (dorsal and ventral); gonocoxite with dorsal lobe blunt; apical lobe with inner angle weak; volsellae with minute teeth.
VESTITURE. Generally pale to dark ochraceous and as in female except as follows: dorsal thoracic hairs longer and sparser, never fox-red; pollen-collecting hairs absent; terga 1-5 with pale apical fasciae thinner and usually more broadly interrupted medially; sterna 2-5 with weak subapical fimbriae of relatively short, one- to two-ranked, highly plumose hairs.
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Identification |
Extracted from Some Bees in the British Museum by Cockerell (1916).
Andrena (Opandrena) ricardonis
Length U mm; black, the clypeus lemon yellow with
two black spots; hair of face, front and thoracic dorsum long and
fulvous, of cheeks and underside of thorax pallid but not white;
head broader than thorax; cheeks very broad, shining, obtusely
subangulate below level of middle of eye; malar space almost
obsolete; mandibles long, but not so much produced at end as in
A. flavoclypeata; yellow clypeus higher in proportion to its width
than in flavoclypeata. the yellow not approaching eyes at sides; front
dull, sides of vertex shining; antennic long, third joint longer than
fourth, but not nearly as long as four and five combined; flageilum
light fulvous beneath; disc of mesothorax and scutellum shining,
with very sparse and minute punctures; area of metathorax small,
triangular, rugose, the apical part smoother but not polished;
tegulae dark reddish; wings greyish, stigma rather small, dull
amber, nervures dusky testaceous; b. n. meeting t. m.; second s. m.
narrow, receiving first r. n. near its end; first t. c. not near stigma;
legs slender, with hind margin of hind tibia*, and all the tarsi,
ferruginous; abdomen shining, with only very indistinct piliferous
punctures, hind margins of second and following segments with narrow ochreous hair bands, interrupted on second ; apical plate
(eighth ventral) broadly truncate.
Hab.Yernon, British Columbia, June 9, 1902 (Afiss
Ricardo); British Museum. Allied to A. trevoris Ckll., but distinct
by the colour of the antennae and pubescence; possibly, however,
a subspecies.
At Shorts Point, Okanagan Lake, B. C, June 28, 1902, Miss
Ricardo took A. medionitens Ckll., a form with the abdominal
hair bands clear white.
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Updated: 2024-04-26 14:30:44 gmt
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