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Andrena hallii Dunning, 1898
Andrena heterura Cockerell, 1930; Andrena (Tylandrena) hallii Dunning, 1898

Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Melandrena

Andrena hallii, face
Smithsonian Institution, Entomology Department · 1
Andrena hallii, face

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

Andrena hallii, wing
Smithsonian Institution, Entomology Department · 1
Andrena hallii, wing
Overview
Reprinted with permission of the American Entomological Society from: LaBerge, W. E., Bouseman, J. K. 1970. A revision of the bees of the genus Andrena of the Western Hemisphere. Part III. Tylandrena. Transactions of the American Entomological Society 96: 543-605.

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This colorful large species is closely related to A. mesillae Cockerell. The female of hallii is readily distinguished from that of mesillae by the shinier clypeus with a distinct shiny median impunctate line. The male of hallii is easily distinguished from that of mesillae by the longer first flagellar segment. In addition, both sexes of hallii are distinctive and differ from any of the preceding species because of their relatively long facial quadrangles.

FEMALE. MEASUREMENTS AND RATIOS. — N = 20; length, 11-14 mm; width, 3-4 mm; wing length, 5.32 ± 0.254 mm; FL/FW, M = 1.01 ± 0.004; FOVL/FOVW, M = 2.96 ± 0.043.

INTEGUMENTAL COLOR. — Black except as follows: mandible with at least tip rufescent; flagellar segments 2-10 dark brown below; wing veins and pterostigma deep brown to black, membrane deeply infumate, brown; distitarsi rufescent.

STRUCTURE. — Antennal scape equals first three and one-half flagellar segments in length or slightly more; flagellar segment 1 equal in length to segments 2 plus 3 which are equal to each other, each shorter than segment 4 and broader than long; segments 4-10 longer than broad. Eyes each about four times as long as broad, inner margins parallel. Malar space as in mesillae. Galea as in perplexa. Maxillary palpus as in perplexa but segmental ratio about 1.0:1.2:0.9:0.9:0.7:0.7. Labial palpus as in perplexa but ratio about 1.0:0.7:0.6:0.6. Labral process as in mesillae but usually slightly emarginate apically; labrum below process as in mesillae. Clypeus somewhat flattened medially, long, with round deep punctures separated by half a puncture width or more except along prominent impunctate midline, surface shiny, unshagreened except at extreme base. Supraclypeal area with longitudinal rugulae and fine punctures dulling surface. Genal areas and face above antennae as in perplexa. Vertex above lateral ocellus equals almost two ocellar diameters, sculptured as in perplexa.

Pronotum as in mesillae. Mesoscutum and scutellum sculptured as in mesillae. Propodeum as in mesillae but dorsal enclosure with roughened basal area smaller and without transverse rugulae apically. Mesepisterna and wing venation as in mesillae. Tergum 1 with apical area impunctate or with minute scattered punctures separated by four or more puncture widths; basal area with small punctures separated mostly by two to four puncture widths or more, often virtually impunctate; surfaces shiny, reticular shagreening fine but reticules of shagreening coarse. Terga 2-4 with apical area punctures minute, separated by two to four puncture widths or more, surface moderately dulled by reticular shagreening or shiny; basal area punctures small, separated by one to two puncture widths or more, surfaces shiny. Pygidial plate and sterna as in mesillae.

VESTITURE. — Black except as follows: head with pale hairs on occiput behind vertex, often with a few pale hairs on face near antennal bases, occasionally most head hairs pale; thoracic dorsum with hairs ranging from pale ochraceous to bright fox-red, with a more or less well-developed band of black along posterior margin of mesoscutum (may be restricted to a few black hairs in posterolateral corners of mesoscutum and on axillae or rarely entirely absent); sides of thorax and propodeum occasionally with pale hairs but usually a few dark hairs at least ventrally and on interior of corbicula. Terga as in mesillae. Pollen-collecting and sternal hairs as in mesillae.

MALE. MEASUREMENTS AND RATIOS. — N = 12; length, 10-13 mm; width, 2.5-3.5 mm; wing length, M = 4.48 ± 0.360 mm; FL/FW, M = 0.99 ± 0.010; FS1/FS2 (N = 11), M = 1.41 ± 0.024.

INTEGUMENTAL COLOR. — Black except as follows: mandible with apical third rufescent; flagellar segments 2-11 dark brown below; wing veins and pterostigma dark brown to reddish-brown, membrane moderately to deeply infumate, smoky-brown; distitarsi rufescent.

STRUCTURE. — Antenna moderately long, in repose reaching anterior margin scutellum; scape length equals about first two and one-half flagellar segments; flagellar segment 2 distinctly shorter than 3, broader than long or quadrate, segment 3 about as long as 4, 4-11 longer than broad. Eyes each about two and one-third times as long as broad, inner margins parallel. Malar space, mandible and galea as in female. Maxillary palpus as in perplexa but segmental ratio about 0.7 :1.0:0.8 :0.7:0.6:0.6. Labial palpus as in perplexa but ratio about 1.0 :0.5 :0.5 :0.4. Labral process entire or very weakly emarginate apically, thick, curved, without median sulcus, shiny; labrum below process without transverse sulcus or cristae. Clypeus rounded, with large deep punctures separated mostly by half a puncture width or less except in impunctate midline, surface shiny, unshagreened except at extreme base. Supraclypeal area, genal area, face above antennae and vertex as in perplexa. Thoracic sculpturing as in female except as follows: mesoscutal and scutellar punctures usually smaller and somewhat sparser; propodeum with lateral surface coarsely punctate and tessellate, dull; mesepisternum with punctures more crowded, dulled by tessellation. Wing venation as in female. Tergal sculpturing as in female but terga 2-5 similar to female terga 2-4 with basal area punctures sparser; surfaces shiny, shagreening delicate if present. Sterna 2-5 with apical areas impunctate, sparsely punctate in basal halves, punctures more crowded near apical area, surfaces moderately dulled by reticular shagreening. Sternum 6 without median longitudinal sulcus, not markedly emarginate apically.

Terminalia as figured (Figs. 56-60) but note the following: gonocoxite with apical process sparsely pubescent, dorsal lobe rather blunt apically; sternum 7 with apical lobes broad; sternum 8 as in mesillae but apex broader.

VESTITURE. — Highly variable but sterna, terga (except 1 and 2), tarsi, tibiae and lower surfaces hind femora always with black or dark brown hairs. In darker specimens vestiture black except a few pale hairs on occiput and dorsal thoracic hairs pale ochraceous to bright fox-red. In pale specimens entirely pale ochraceous except as given in first statement. Sterna 2-5 with sparse long subapical hairs, but subapical fimbriae poorly distinguished from more basal hairs. Sternum 6 without a well-formed subapical fimbria.

REMARKS. — The variation in color of the vestiture is remarkable but cannot be regarded as a basis for recognition of subspecies. The variation does not exhibit a clear geographical pattern, although the palest specimens are all from Colorado and southeastern Wyoming. Melanistic individuals can be taken throughout the range of the species and the red thoracic coloring appears to be more common than the ochraceous (although a few long series of females may account for this) and can be found in all localities except the eastern Colorado localities.

Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Asteraceae  Senecio streptanthifolius @ BBSL (1)

Taraxacum officinale @ BBSL (1)
Boraginaceae  Amsinckia sp @ BBSL (1)

Hackelia patens @ BBSL (1)

Hackelia sp @ BBSL (4)
Brassicaceae  Sisymbrium sp @ BBSL (3)

Stanleya pinnata @ BBSL (5)
Fabaceae  Astragalus sp @ BBSL (1)

Medicago sativa @ BBSL (3)

Melilotus officinalis @ BBSL (51)

Trifolium barnebyi @ BBSL (2)
Grossulariaceae  Ribes aureum @ BBSL (2)
Lamiaceae  Salvia sp @ BBSL (1)
Liliaceae  Allium geyeri @ BBSL (2)

Calochortus sp @ BBSL (3)
Malvaceae  Sphaeralcea coccinea @ UCRC_ENT (1)

Sphaeralcea sp @ BBSL (3)
Papaveraceae  Romneya coulteri @ BBSL (1)

Romneya @ UCRC_ENT (1)
Polycitoridae  Salix sp @ BBSL (1)
Polygonaceae  Eriogonum pelinophilum @ BBSL (3)
Rosaceae  Cercocarpus montanus @ BBSL (1)
Salicaceae  Salix exigua @ BBSL (2)
Scrophulariaceae  Penstemon harringtonii @ BBSL (1)
_  Apiaceae sp @ BBSL (1)

Asteraceae sp_( @ BBSL (2)

Withheld @ BBSL (32)

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Updated: 2024-03-28 13:06:59 gmt
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