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Andrena plumiscopa Timberlake, 1951
Andrena (Pterandrena) plumiscopa Timberlake, 1951

Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Augandrena

Andrena plumiscopa, female, face
Deana Crumbling · 9
Andrena plumiscopa, female, face

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Andrena plumiscopa, female, side
Deana Crumbling · 9
Andrena plumiscopa, female, side
Andrena plumiscopa, female, top
Deana Crumbling · 9
Andrena plumiscopa, female, top

Andrena plumiscopa, female, wing
Deana Crumbling · 9
Andrena plumiscopa, female, wing
Andrena plumiscopa, female, face
Smithsonian Institution, Entomology Department · 9
Andrena plumiscopa, female, face

Andrena plumiscopa, female, side
Smithsonian Institution, Entomology Department · 9
Andrena plumiscopa, female, side
Andrena plumiscopa, female, top
Smithsonian Institution, Entomology Department · 9
Andrena plumiscopa, female, top

Andrena plumiscopa, female, wing
Smithsonian Institution, Entomology Department · 9
Andrena plumiscopa, female, wing
Andrena plumiscopa, face
Smithsonian Institution, Entomology Department · 1
Andrena plumiscopa, face

Andrena plumiscopa, side
Smithsonian Institution, Entomology Department · 1
Andrena plumiscopa, side
Andrena plumiscopa, top
Smithsonian Institution, Entomology Department · 1
Andrena plumiscopa, top

Andrena plumiscopa, face
Smithsonian Institution, Entomology Department · 1
Andrena plumiscopa, face
Andrena plumiscopa, side
Smithsonian Institution, Entomology Department · 1
Andrena plumiscopa, side

Andrena plumiscopa, top
Smithsonian Institution, Entomology Department · 1
Andrena plumiscopa, top
Andrena plumiscopa, wing
Smithsonian Institution, Entomology Department · 1
Andrena plumiscopa, wing
Overview
Reprinted with permission of the American Entomological Society from: LaBerge, W. E. 1985. A revision of the bees of the genus Andrena of the Western Hemisphere. Part XI. Minor subgenera and subgeneric key. Transactions of the American Entomological Society 111: 440-567.

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This small species, known only from California, can be recognized by the short maxillary palpi, the shiny galeae, and the pale metallic integument of both sexes, together with the plumose scopal hairs of the females. Andrena plumiscopa seems to be important as a pollinator of both Platystemon (Hannan, 1981) and Cryptantha in California.

FEMALE. MEASUREMENTS AND RATIOS: N = 20; length, 8-10 mm; width, 2.5-3.5 mm; wing length, M=3.14±0.166 mm; FL/FW, M=0.97±0.010; FOVL/FOVW, M=3.19±0.049.

INTEGUMENTAL COLOR. — Metallic blue green to blue except as follows: mandible with apical half rufescent, black basally; clypeus black; flagellar segments 2 or 3-10 red to yellow below; wing membranes hyaline, veins reddish brown to red; tegulae testaceous; tibial spurs pale; metasomal terga piceous.

STRUCTURE. — Antennal scape slightly longer than first three flagellar segments or as long; flagellar segment 1 as long as following two and one-third segments; segments 2 and 3 broader than long; median segments quadrate. Eyes each three and three-fourths times as long as broad, inner margins converging toward mandibles. Malar space linear. Outer mandible when closed extends beyond midlabrum by no more than one-fifth mandibular length, bidentate. Galea with outer margin straight, broadened basally, surface shiny, unshagreened. Maxillary palpus slightly shorter than galea, segmental ratio about 1.0:1.0:0.8:0.5:0.4:0.4. Labial palpus with third segment short, extending much beyond insertion of fourth segment, which is inserted near base of 3, and palpus appears crooked at this point; segmental ratio about 1.0:0.4:0.2:0.4. Labral process trapezoidal, broader than long, occasionally weakly emarginate apically, usually entire; labrum below process twice as long as process, convex, with weak median crista. Clypeus with small round punctures separated mostly by half a puncture width or more; median impunctate longitudinal ridge present; surface dulled by fine shagreening. Supraclypeal area dull, tessellate. Face above antennal fossae with fine longitudinal rugulae and small interrugal punctures dulling surface. Facial fovea large, shallow. Vertex above lateral ocellus equals half an ocellar diameter or less; surface opaque, tessellate. Genal area moderately shiny, with minute punctures and coarse shagreening.

Pronotum without humeral angles or dorsoventral ridges, oblique suture distinct, impressed; surface dulled by dense reticular shagreening. Mesoscutum, scutellum, and metanotum opaque, coarsely tessellate, punctures present but sparse and obscured by tessellation. Propodeum with dorsal enclosure densely and evenly tessellate but roughened along extreme base; surface outside of enclosure dulled by dense tessellation, punctures absent or obscured by tessellation.

Metasomal terga 1-4 opaque, densely tessellate, discs with small punctures separated mostly by two to three puncture widths but often obscured by tessellation and visible only at certain angles. Pygidial plate V-shaped, apex relatively sharp, weakly raised median ridge not forming sharp internal triangular area. Sterna 2-5 with impunctate, shagreened apical areas; basal areas with punctures separated mostly by two to three puncture widths apically, sparse near base of each sternum; moderately shiny, lightly shagreened.

VESTITURE. — White except as follows: dorsum of thorax and often vertex of head ochraceous; hind tibial plate, surrounding end of femur and along posterior margin of tibiae dark brown; often fore and middle tibiae with outer surfaces brown; hind basitarsi on inner surface often brown; terga 5 and 6 entirely or partly brown. Hind tibial scopal hairs weakly plumose throughout, strongly so along posterior margin.

MALE. MEASUREMENTS AND RATIOS. — N = 16; length, 7.0-8.5 mm; width, 1.5-2.0 mm; wing length, M=2.82±0.226 mm; FL/FW, M= 1.09±0.012; FS/FS2, M= 1.48 ±0.034.

INTEGUMENTAL COLOR. — As in female except as follows: clypeus cream colored except narrow apical margin and small tentorial maculae; parocular areas cream colored to same level as posterior margin clypeus; metasomal terga 1-5 with apical areas hyaline at apices, becoming rufescent basally.

STRUCTURE. — Antennal scape about as long as first two flagellar segments; flagellar segment 1 as long as following one and one-half flagellar segments or less; segment 2 about as long as broad; segments 3-11 longer than broad. Eyes each about two and three-fourths times as long-as broad, inner margins strongly converging toward mandibles. Malar space, galea, maxillary palpus, labial palpus, and mandible as in female. Labral process as in female but usually weakly emarginate apically. Clypeus with small punctures separated by one to two or three puncture widths; surface moderately shiny to dull, shagreened; median impunctate line present. Supraclypeal area, face above antennal fossae, and vertex as in female. Ocelli slightly enlarged, median ocellus about as broad as median flagellar segments. Genal area in profile slightly broader than eye (about 5:4), sculptured as in female.

Pronotum without humeral angle or dorsoventral ridge. Thoracic sculpturing as in female, but mesoscutal punctures slightly more noticeable, especially in anterior third, dull posteromedially.

Metasomal terga 1-5 sculptured as in female terga 1-4, but tessellation slightly weaker (terga, especially terga 3-5, often moderately shiny), punctures more evident. Sterna 2-5 with narrow apical areas impunctate; basal areas with punctures separated by two to three puncture widths in apical third, sparser basally; surfaces moderately shiny, weakly shagreened. Sternum 6 with apical margin not reflexed, emarginate apically. Terminalia as in figures 124-128. Note penis valves broadened near base, elongate and narrow at tips; dorsal lobe gonocoxite prominent; sternum 8 entire apically.

VESTITURE. — White to pale ochraceous except as follows: dorsum of thorax occasionally ochraceous; terga 6 and 7 often golden to pale brown.

Names
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