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Andrena striatifrons Cockerell, 1897
Trachandrena pernuda Viereck, 1904; Andrena trachandrenoides Viereck, 1904; Andrena (Trachandrena) marioides Viereck, 1917; Andrena (Trachandrena) politissima Cockerell, 1918; Andrena dolichotricha Cockerell, 1924; Andrena (Trachandrena) brevibasis Cockerell, 1931; Andrena (Trachandrena) postnitens Cockerell, 1931

Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Trachandrena

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

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

Andrena striatifrons, female, wing
Smithsonian Institution, Entomology Department · 9
Andrena striatifrons, female, wing
Andrena striatifrons FEM mm
© Copyright Laurence Packer 2014 · 7
Andrena striatifrons FEM mm

Andrena striatifrons MALE CFP
© Copyright Laurence Packer 2014 · 7
Andrena striatifrons MALE CFP
Andrena striatifrons, Barcode of Life Data Systems
Barcode of Life Data Systems · 1
Andrena striatifrons, Barcode of Life Data Systems

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

Andrena striatifrons, top
Smithsonian Institution, Entomology Department · 1
Andrena striatifrons, top
Andrena striatifrons, wing
Smithsonian Institution, Entomology Department · 1
Andrena striatifrons, wing
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 western species is highly variable in color and because of this several names have entered the literature for various color variants. A. striatifrons is very similar to A. mariae but can be recognized in both sexes by the following characters: the face above the antennal fossae is more coarsely rugose with sparse, more obscure punctures especially in the female, the mesoscutal punctures are larger and sparser and the surface more often shiny, the propodeal dorsal area has very much finer rugae, being in some cases barely visible. In addition females have distinctly longer apical areas of the second and third terga. The males also have longer apical areas on terga 2-4, but this is more variable and less reliable a character than in the female.

FEMALE. MEASUREMENTS AND RATIOS. N = 20; length, 8.5-12.0 mm; width, 2.5-4.0 mm; wing length, M = 4.17 0.223 mm; FL/FW, M = 0.99 0.004; FOVL/FOVW, M = 3.49 0.046.

INTEGUMENTAL COLOR. Black except as follows: mandible with at least apical fourth (or subapical fourth) to one-half rufescent; flagellum dark brown to reddish-brown below; wing membranes hyaline, slightly infumate, veins red to dark reddish-brown; tegulae testaceous to brownish; metasoma variable, from entirely black with slightly rufescent apical areas of terga 2-4 to entirely orange-red with a few dark spots, all transitions between these extremes exist without any distinctive trends, occasionally in dark specimens terga with slight purplish reflections; legs with tarsi rufescent, middle and hind legs of dark specimens with basitarsi orange, all basitarsi, hind tibiae and at least apices of fore and middle tibiae orange in red specimens.

STRUCTURE. Antennal scape length equal to first three and one-half flagellar segments; flagellar segment 1 about as long as segments 2 plus 3, segment 2 about as long as 3 and each as broad as long or slightly broader. Eyes each about three and one-half times as long as broad, inner margins parallel. Malar space short but distinct, minimum length about one-fifth width. Mandible and galea as in sigmundi but galea somewhat less broad. Maxillary palpus as in sigmundi but segmental ratio about as 1.0:0.8:0.6:0.5:0.5:0.4. Labial palpus as in sigmundi but ratio about as 1.0:0.7:0.3:0.3. Labral process as in sigmundi; labrum apical to process without transverse sulcus, with weak cristae, punctures and tessellation dulling surface. Clypeus and supraclypeal area with moderate-sized, deep, round punctures, without median line, surface shiny, slightly tessellate peripherally. Genal area broader than eye in profile, with minute longitudinal rugulae, fine punctures and dense shagreening dulling surface, ventrally as in sigmundi. Vertex as in sigmundi. Face above antennal fossae with coarse longitudinal rugae extending to ocelli, sparse interrugal punctures present but indistinct, surface moderately shiny. Facial fovea as in marine.

Pronotum normal, as in sigmundi. Mesoscutum and scutellum as in marine but punctures average slightly larger and sparser medially and surface usually at least moderately shiny, occasionally somewhat dulled by coarse tessellation. Mesepisternum with small shallow punctures separated by half a puncture width or more, surface dulled by fine reticular shagreening. Propodeum with dorsal area with one or more complete and usually several irregular rugulae but these extremely weak and in some specimens barely visible, surface tessellate, dull; posterior and dorsolateral surfaces moderately coarsely rugatulopunctate but ridges low; lateral surface entirely (or almost so) coarsely rugose with short, anastomizing rugae. Fore femur with base rounded. Posterior hind tibial spur normal, not curved in outer third. Wing venation as in mariae.

Metasomal tergum 1 with a few scattered punctures across extreme base of dorsal surface, apical area medially longer than basal area, surface shiny, unshagreened or weakly so. Tergum 2 with apical area usually three times as long as basal area or more, often basal area almost nonexistent, impunctate, narrow basal area with small round punctures separated by one to three puncture widths or more, surface shiny. Terga 3 and 4 similar to 2 but basal areas slightly longer. Pygidial plate V-shaped with narrowly rounded apex, sides straight, inner raised triangle present but space between inner triangle and margins narrow. Sterna 2-5 with basal areas with small round punctures separated mostly by half to one puncture width, sparse at extreme base, surfaces dulled by fine reticular shagreening.

VESTITURE. Generally pale ochraceous; arrangement as in mariae but generally somewhat longer especially on terga 2-5 where lateral patches of pubescence when not worn composed of long, densely plumose hairs.

MALE. MEASUREMENTS AND RATIOS. N = 20; length, 8.5-11.0 mm; width, 2-3 mm; wing length, M = 3.91 0.237 mm; FL/FW; M = 1.03 0.006; FS1/FS2, M = 1.02 0.019.

INTEGUMENTAL COLOR. Generally as in female except as follows: mandible usually with only tip rufescent; first flagellar segment black below except occasionally with apical orange area; terga and sterna usually black, often with red-orange markings basally but rarely entirely red as in female; in black specimens terga occasionally with purplish reflections.

STRUCTURE. Antennae in repose reaching metanotum; scape length and flagellar segments as in sigmundi but first flagellar segment usually as long as second or only slightly shorter, occasionally slightly longer. Eyes each about three and one-fourth times as long as broad, inner margins only slightly converging towards mandibles. Malar space, mandible and galea as in female. Maxillary palpus as in female but segmental ratio about as 1.0:1.0:0.9:0.7:0.7:0.6. Labial palpus as in female but ratio about as 1.0:0.6:0.6:0.6. Labral process as in sigmundi but often entire. Clypeus as in female but punctures smaller and more crowded. Supraclypeal area as in female but punctures crowded and surface dull. Genal area and vertex as in female. Face above antennal fossae with coarse longitudinal rugae frequently interrupted by large coarse punctures especially medially where occasionally rugatulopunctate rather than rugose.

Pronotum as in female. Mesoscutum and scutellum as in female but punctures smaller and tessellation denser. Mesepisternum as in female but finely and densely tessellate. Propodeum as in female but dorsal area often slightly more coarsely rugulate and lateral surfaces more finely rugatulopunctate. Hind tibial spur and venation as in female.

Metasomal tergum 1 with apical area equal to less than length of basal area dorsally, impunctate except at extreme base, basal area with small punctures separated largely by two to five puncture widths, surface shiny. Terga 2-5 with apical areas equal to half tergal length or more medially, impunctate except near base, basal areas with small punctures separated mostly by two to three puncture widths, surfaces slightly dulled by coarsely reticulate, fine shagreening. Sterna 2-5 sparsely punctate basally, with coarsely reticulate shagreening moderately dulling surfaces. Sternum 6 with broad, shallow, apical emargination (not strongly V-shaped, but rounded). Terminalia as in sigmundi; see figures 42-43.

VESTITURE. Generally ochraceous and much as in marine but hairs longer, particularly hairs of basal area of tergum 2 at least as long as median length of apical tergal area.

Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Polycitoridae  Salix sp @ BBSL (52)
Rosaceae  Malus pumila @ BBSL (2)

Prunus avium @ BBSL (1)

Prunus domestica @ BBSL (1)

Prunus sp @ BBSL (2)
Salicaceae  Salix @ AMNH_BEE (2)
_  Withheld @ BBSL__YOSE (2); BBSL (37)

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Updated: 2019-08-19 01:50:46 gmt
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