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Andrena fuscicauda Viereck, 1904
Trachandrena fuscicauda Viereck, 1904; Andrena (Trachandrena) californica Timberlake, 1951; Andrena (Trachandrena) californica wickhami Timberlake, 1951

Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Trachandrena

Andrena fuscicauda, female, face
Smithsonian Institution, Entomology Department · 9
Andrena fuscicauda, female, face

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

Andrena fuscicauda, female, face
Smithsonian Institution, Entomology Department · 9
Andrena fuscicauda, female, face
Andrena fuscicauda, female, side
Smithsonian Institution, Entomology Department · 9
Andrena fuscicauda, female, side

Andrena fuscicauda, female, top
Smithsonian Institution, Entomology Department · 9
Andrena fuscicauda, female, top
Andrena fuscicauda FEM CFP
© Copyright Laurence Packer 2014 · 7
Andrena fuscicauda FEM CFP

Andrena fuscicauda
Hartmut Wisch · 1
Andrena fuscicauda
Andrena fuscicauda
Hartmut Wisch · 1
Andrena fuscicauda

Andrena fuscicauda, side
Hartmut Wisch · 1
Andrena fuscicauda, side
Andrena fuscicauda, top
Hartmut Wisch · 1
Andrena fuscicauda, top
Overview
Reprinted with permission of the American Entomological Society from: LaBerge, W. E. 1973. A revision of the bees of the genus Andrena of the Western Hemisphere. Part VI. Subgenus Trachandrena. Transactions of the American Entomological Society 99: 235-371.

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This species from the west-coast area is related to A. amphibola. The female of fuscicauda resembles that of amphibola in the coarsely punctate mesoscutum, the long apical area of the second tergum, and the finely sculptured propodeum (outside of the dorsal enclosure) but differs from the female of amphibola in the broader facial fovea and the more rounded basal angle of the front femur. The male of fuscicauda is very similar to that of amphibola but differs in the shorter first flagellar segment, the more densely punctate and duller mesoscutum and the distinct apical pale fasciae usually present on terga 2-5.

FEMALE. MEASUREMENTS AND RATIOS. N = 20; length, 9-12 mm; width, 3.0-3.5 mm; wing length, M = 4.10 0.233 mm; FL/PW, M = 0.98 0.005; FOVL/FOVW, M = 3.15 0.015.

INTEGUMENTAL COLOR. Black except as follows: mandible with apical third to half rufescent; flagellar segments 3-10 dark brown to brownish-black below; tegulae piceous; wing membranes hyaline, infumate, yellowish-brown, veins dark brown to blackish-brown; distitarsi slightly rufescent; tibial spurs rufescent.

STRUCTURE. Antennae as in sigmundi except flagellar segment 2 slightly shorter than 3 and slightly broader than long. Eyes, malar space and mandibles as in sigmundi. Galea as in sigmundi but shinier. Maxillary palpus as in sigmundi but segmental ratio about as 1.0:1.0:0.7:0.7:0.6:0.6. Labial palpus as in sigmundi but ratio about as 1.0:0.4:0.5:0.4. Labral process trapezoidal, usually rather narrow apically and usually about one and one-half times as broad at base as median length; labrum below process dull, flat, with several minute cristae. Clypeus sculptured as in sigmundi but punctures often more crowded. Supraclypeal area as in sigmundi. Genal area in profile slightly broader than eye, with small round punctures separated mostly by half to one puncture width, rugulae absent or extremely weak and only in posterior third or less; surface shiny, shagreening absent or delicate. Vertex as in sigmundi. Face above antennal fossae with distinct crowded round punctures separated mostly by less than half a puncture width; surface moderately shiny to dull, delicately shagreened; often with a few to four or five weak rugulae laterally near foveae. Fovea separated from lateral ocellus by three-fourths to one ocellar diameter, lower portion broad (as in hippotes).

Pronotum normal, with small punctures, surface shiny or moderately so. Mesoscutum with crowded coarse punctures in anterior third and peripherally, punctures separated by sharp ridges (rugatulopunctate), posteromedially separated by half a puncture width or less; surface and bottoms of punctures dulled by fine reticular shagreening. Scutellum similar to mesoscutum in anterior third but punctures slightly larger. Metanotum opaque, with small crowded punctures and dense fine tessellation. Propodeum as in amphibola but dorsal enclosure with rugae irregular, usually forming a reticular pattern. Mesepisterna, wing venation and tibial spurs as in amphibola.

Metasomal tergum 1 with apical area indistinct but equal in length to more than half median tergal length; basal area punctures distinct but sparse, often separated by three to seven or eight puncture widths; apical area with narrow impunctate rim, basally apical area punctures more crowded than in basal area, separated mostly by one to two puncture widths. Tergum 2 with apical area equal in length to twice basal area medially; basal area punctures separated mostly by one-half to one puncture width; apical area punctures as in tergum 1; surface shiny, unshagreened. Terga 3 and 4 as in tergum 2 except apical area shorter (less than twice basal area medially) and apical area punctures sparser and smaller. Pygidial plate V-shaped with rounded apex and distinct raised internal triangular area. Sterna as in sigmundi.

VESTITURE. Pale ochraceous to ochraceous, often red on vertex and thoracic dorsum; terga 5 and 6, outer surfaces tarsi, fore and middle tibiae and surrounding basitibial plate brown; form and distribution of hair as in amphibola; terga 2-5 occasionally with apical pale fasciae but these broadly interrupted medially when present.

MALE. MEASUREMENTS AND RATIOS. N = 20; length, 7.5-10.0 mm; width, 2-3 mm; wing length, M = 3.51 0.205 mm; FL/FW, M = 1.07 0.006; FS1/FS2, M = 0.62 0.016.

INTEGUMENTAL COLOR. Black with same exceptions as female but flagellar segments 2-11 dark reddish-brown to brownish-black below; wing veins often dark reddish-brown; tergal apical areas often rufescent or somewhat translucent; distitarsi rufescent; tibial spurs usually testaceous.

STRUCTURE. Antennae as in sigmundi. Eyes each about two and one-half times as long as broad, inner margins converging towards mandibles. Malar space, mandible and galea as in female. Maxillary palpus as in female but segmental ratio about as 1.0:1.0:0.8:0.7:0.7:0.8. Labial palpus as in female but ratio about as 1.0:0.6:0.4:0.7. Labrum, clypeus, and supraclypeal area as in sigmundi. Face above antennal fossae coarsely rugatulopunctate, surface dulled by fine tessellation, without evident rugulae. Vertex as in sigmundi. Genal area distinctly punctate, with several indistinct rugulae in posterior third, shiny or moderately so.

Pronotum as in female. Mesoscutum as in female but punctures smaller, surface dull. Scutellum similar but moderately shiny. Propodeum, metanotum and mesepisternum as in female. Tibial spurs normal. Wing venation as in sigmundi.

Metasomal tergum 1 with apical area indistinct, less than half as long as basal area; with distinct round punctures (except in narrow impunctate rim) separated mostly by one-half to one puncture width, surface shiny. Tergum 2 with apical area about three-fourths as long as basal area medially, with small deep punctures (except in narrow impunctate rim) separated mostly by one puncture width (apical area punctures slightly sparser than those of basal area). Terga 3-5 similar but progressively sparser punctures and shorter apical areas posteriorly. Sterna 2-5 with apical margins impunctate, basal areas with punctures separated mostly by one to two puncture widths or more, surfaces shiny to moderately dulled by fine reticular shagreening. Sternum 6 distinctly emarginate apically. Terminalia as in sigmundi; see figures 66-67.

VESTITURE. Generally pale ochraceous, occasionally reddish on vertex and thoracic dorsum; inner surfaces tarsi yellow; form and distribution of hairs as in amphibola except terga 2-5 with distinct apical pale fasciae which on terga 2 and 3 and often 4 are interrupted medially (rarely fasciae absent and then due to wear).

Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Ericaceae  Arctostaphylos patula @ UCRC_ENT (1)

Arctostaphylos @ AMNH_BEE (1)
Fagaceae  Quercus dumosa @ UCRC_ENT (2)
Rhamnaceae  Ceanothus cordulatus @ UCRC_ENT (5)

Ceanothus @ UCRC_ENT (1)
Rosaceae  Horkelia parryi @ UCRC_ENT (4)

Malus @ UCRC_ENT (1)
Salicaceae  Salix laevigata @ UCRC_ENT (4)
_  Withheld @ BBSL (3)

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Updated: 2024-06-21 06:49:43 gmt
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