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Andrena plana Viereck, 1904
Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Scaphandrena


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Overview
Reprinted with permission of the American Entomological Society from: Ribble, D. W. 1974. A revision of the bees of the genus Andrena of the Western Hemisphere. Subgenus Scaphandrena. Transactions of the American Entomological Society 100: 101-189.

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This species is the most easily recognized Scaphandrena. Both sexes have a flattened clypeus with even reticular shagreening and in the female the thoracic dorsum is velvety amber due to short moss-like hairs.

The descriptions below are based mainly on a female from 1.4 mi. S.E. Jolon and a male from Goshen.

FEMALE. MEASUREMENTS AND RATIOS. Length, 9.5 mm; width, 2.6 mm; wing length, 6.3 mm; FL/FW, 0.99; FOVL/FOVW, 3.33. INTEGUMENTAL COLOR. Color as in scurra but hind legs entirely dark. STRUCTURE. Antennal scape slightly longer than first four flagellar segments; flagellar segment 1 distinctly longer than segments 2 plus 3; segment 2 slightly shorter than 3; segment 3 equal to 4; antenna otherwise as in scurra. Eyes each about 3.7 times as long as broad, inner margins as in scurra. Galea pointed, moderate in width, surface dulled by even reticular shagreening. Stipes as in scurra. Labial palpus as in scurra but ratio about 1.0:0.7:0.7:0.7. Maxillary palpus surpassing galea by less than last two segments, segmental ratio about as 1.0:1.0:1.0:0.9:0.7:0.7. Labral process wide, narrow, flat, only slightly elevated, shagreened; labrum below process as in scurra. Clypeus flattened in center, scattered punctures obscured by even reticular shagreening. Supraclypeal area as in scurra. Face above antennal fossae with weak longitudinal rugulae and rather coarse reticular shagreening, moderately dull. Facial fovea as in scurra. Vertex above lateral ocellus with weak transverse ridge, about as high as two-thirds ocellar diameter, moderately dull. Genal area about as wide as eye in profile, surface moderately dull with minute punctures obscured by reticular shagreening.

Pronotum as in scurra but punctures obscured by reticular shagreening. Mesoscutum dull, punctures and rather coarse reticular shagreening obscured by hairs. Scutellum surface as mesoscutal surface. Propodeum with dorsal area triangular with coarse but regular reticular shagreening, few rugulae basally; remainder of propodeum as in scurra except a little smoother and more regular shagreening. Mesepisternum as in scurra but reticular shagreening rather coarse. Wings as in scurra but second submarginal cell distinctly narrowed anteriorly. Legs as in scurra but hind tibia only moderately widened apically.

Metasomal tergum 1 without apicolateral elevation, terga 2-4 with weak elevations, weakly shiny with moderate shagreening, graduli on terga 3 and 4, terga otherwise as in scurra. Pygidial plate as in scurra. Sterna 2-5 as in scurra but punctures further apart.

VESTITURE. Generally white; facial fovea amber under some lightings; on thoracic dorsum hairs with yellow-brownish tinge, hairs short, plumose, mosslike, anteriorly few longer hairs; surface of hind tibia easily visible; metasomal terga 1-4 with moderately well developed apical white fasciae, reduced to small patches at sides on tergum 1, thinner medially on tergum 2; otherwise hairs as in scurra.

MALE. MEASUREMENTS AND RATIOS. Length, 8.0 mm; width, 2.0 mm; wing length, 5.5 mm; FL/FW, 0.94; FS1/FS2, 1.70.

INTEGUMENTAL COLOR. As in female but clypeus cream colored except apex and two small dark spots.

STRUCTURE. Antennae rather short reaching scutellum in repose; scape length nearly as long as first three flagellar segments; flagellar segment 1 distinctly shorter than segment 2 plus 3; antennae otherwise as in scurra. Eyes each about three and one-third times as long as broad, inner margins as in scurra. Mandible, stipes and galea as in female. Labial palpus as in female but ratio about 1.0:0.8:0.7:0.8. Maxillary palpus as in female but ratio about 0.7:0.9:0.6:0.7:0.7:1.0. Labral process wide, narrow, apex with two broadly rounded lobes, moderately elevated. Clypeus, supraclypeal area and face above antennal fossae as in female. Vertex as in female but height almost equal to one ocellar diameter. Genal area as in female.

Pronotum as in female. Mesoscutum and scutellum as in female but surface easily visible. Propodeum and mesepisternum as in female. Wings as in female but vein 1st m-cu meets second submarginal cell near middle of cell. Legs as in scurra but legs rather slender.

Metasomal terga 1-4 as in female but shinier with rather fine shagreening, punctures scattered, graduli absent on tergum 4. Tergum 5 as in scurra. Pygidial plate absent. Sterna 2-6 as in scurra.

Terminalia as in figures 54-58; note the following: gonocoxite with dorsal lobes absent, apex broad; penis valve with dorsal hump, apex short, thick, broadly rounded in side view; sternum 7 narrow and emarginate at apex; sternum 8 with apex slightly broader than neck region.

VESTITURE. Generally as in scurra but hairs all whitish, less abundant, tergum 1 with long hairs, sterna 2-5 with. subapical fimbriae weakly developed.

Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Asteraceae  Baccharis @ AMNH_BEE (2)

Baeria @ AMNH_BEE (1)

Layia platyglossa @ BBSL (1)
Fabaceae  Trifolium willdenovii @ AMNH_BEE (5)

Trifolium @ AMNH_BEE (2)
Hydrophyllaceae  Nemophila sp @ BBSL (2)
Polemoniaceae  Gilia sp @ BBSL (1)
_  Withheld @ BBSL (16); BBSL__YOSE (19)

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Updated: 2018-06-21 10:51:22 gmt
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