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Andrena dimorpha Mitchell, 1960
Andrena (Pterandrena) dimorpha Mitchell, 1960

Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Archiandrena

Andrena dimorpha, male AMNH BEE00227112-3
© Copyright Hadel Go 2011-2016 · 8
Andrena dimorpha, male AMNH BEE00227112-3

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    Easily recognized eastern species with yellow clypeus (sometimes parocular area with small yellow spots), basal mandible tooth, and first flagellomere less than half length of second.
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Andrena dimorpha, male AMNH BEE00227112-1
© Copyright Hadel Go 2011-2016 · 7
Andrena dimorpha, male AMNH BEE00227112-1
Andrena dimorpha, male AMNH BEE00227112-2
© Copyright Hadel Go 2011-2016 · 7
Andrena dimorpha, male AMNH BEE00227112-2

Andrena dimorpha, figure24j
Mitchell, Bees of the Eastern United States, Vol. I, 1960 · 1
Andrena dimorpha, figure24j
Andrena dimorpha, male, face
© Rebekah Andrus Nelson · 1
Andrena dimorpha, male, face

Andrena dimorpha, female, face
© Copyright source/photographer · 1
Andrena dimorpha, female, face
Andrena dimorpha, male, sternal plates 7 and 8
© Copyright source/photographer · 1
Andrena dimorpha, male, sternal plates 7 and 8
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 interesting small species is rare in collections. It is similar to A. banksi in the weakly punctate clypeus, the short first flagellar segment, and the large pygidial plate of both sexes. The female is distinctive in its male-like, elongate antennae, plumose tibial scopal hairs, and plumose corbicular hairs, as described below. The male is unique in the well-formed basal mandibular teeth, the parocular yellow spot, . and the apical fasciae on metasomal terga 2-5.

FEMALE. MEASUREMENTS AND RATIOS: N = 6; length, 9-10 mm; width, 3.0-3.5 mm; length, M=3.650.160 mm; FL/FW, M=0.890.013; FOVL/FOVW, M=2.56 0.239.

INTEGUMENTAL COLOR. Black except as follows: mandible with apical half or more rufescent; flagellum below dark brown; tegulae hyaline, yellow; wing membranes infumate, brown to yellowish brown, veins orange to red; tibial spurs testaceous; tarsi, hind tibia, and often apex of middle tibia red to yellow; terga and sterna narrowly hyaline apically, yellow to colorless.

STRUCTURE. Antennae moderately long; scape length equals first three flagellar segments; flagellum male-like, segment 1 no longer than or slightly shorter than segment 2, segments 2-10 distinctly longer than broad. Eyes each about three and three-fourths times as long as broad, inner margins parallel. Malar space short, less than one-fifth as long as basal mandibular width. Mandible when closed extends beyond midlabrum by less than one-fifth its length, with subapical tooth. Labral process entire, flat, shiny, trapezoidal; labrum below process flat or slightly convex, shiny. Clypeus only slightly convex, with minute sparse punctures separated by five to six puncture widths or more except in broad impunctate midline, surface reticularly shagreened except in shiny apicomedian area. Supraclypeal area, face above antennal fossae, and facial foveae as in banksi. Genal area distinctly broader than eye in profile, reticularly shagreened with minute sparse punctures.

Thoracic sculpturing as in banksi, but in some specimens (from northern parts of range) scutellum only weakly shagreened, shiny, and mesoscutum and scutellum more distinctly punctate. Metasomal terga as in banksi, but punctures not at all evident. Pygidial plate and sterna as in banksi.

VESTITURE. Generally pale ochraceous to yellow except as follows: terga 5 and 6, on and surrounding basitibial plates and outer surfaces, fore and middle tibiae brown; inner surfaces tarsi bright golden. Clypeal hairs long, highly plumose; thoracic dorsum with short hair; terga 1-4 with distinct, complete pale pubescent fasciae. Propodeal corbiculum complete anteriorly, interior with long plumose hairs; trochanteral flocculus complete, dense; tibial scopal hairs weakly plumose throughout, especially so along posterior margin.

MALE. MEASUREMENTS AND RATIOS. N = 2; length, about 9 mm; width, about 2 mm; wing length, 3.08-3.38 mm; FL/FW, 0.86-0.89; FS1/FS2, 0.67-0.69.

INTEGUMENTAL COLOR. Black with same exceptions as female, but clypeus yellow and parocular areas with small yellow spots, wing membranes somewhat less infumate, and hind tibiae yellow or orange only in apical thirds.

STRUCTURE. Scape length slightly longer than first two flagellar segments together; flagellar segment 1 short, equals two-thirds or more of segment 2; segments 2-11 longer than broad. Eyes each about three and one-half times as long as broad, inner margins parallel. Malar space as in female. Mandibles elongate, decussate, each with subapical tooth and distinct basal tooth on inferior margin. Labrum as in female, but process shorter and broader and gently emarginate, Clypeus shiny to base, punctures minute, evident only laterally. Supraclypeal area and face above antennal fossae as in banksi. Vertex above lateral ocellus equals; about one ocellar diameter, sculptured as in banksi. Genal area as in banksi, but j posterior finger-like process reduced to a process broader than long.

Thorax, terga, and sterna sculptured as in banksi, but punctures less evident, Tergum 7 with distinct large pygidial plate as in banksi, but more V-shaped with rounded apex. Sternum 6 deeply and broadly emarginate apically. Terminalia (Figs. 49-53) much as in banksi, but sternum 8 much shorter and broader.

VESTITURE. Ochraceous to yellow; terga 1-5 with narrow pale apical fasciae; sterna 2-5 with weak, short, subapical fimbriae.

Reprinted with permission from: Mitchell, T.B. 1960. Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 141.

FEMALE Length 11 mm.; clypeus broad, very slightly convex, projecting about one-third below suborbital line, shining medially, with an indistinct, median, impunctate line, minutely and rather sparsely punctate on each side, becoming densely punctate at extreme sides; facial foveae broad, occupying above most of space between eyes and ocelli, covered with pale fulvous tomentum; space between margin of vertex and lateral ocelli subequal to their diameter; cheeks slightly broader than eyes, rounded posteriorly, rather dull, punctures exceedingly minute, obscure and quite close; malar space very short; basal segment of flagellum subequal to 2nd and following segments; process of labrum about twice as broad as long, slightly narrowed toward the rather broadly truncate apex, not emarginate; pubescence of head, thorax and legs fulvous, that on dorsum of thorax short and dense, obscuring the surface; thoracic integument dull and densely tessellate, punctures of scutum and scutellum exceedingly obscure, minute, rather close, hardly visible beneath the pubescence; pleura without visible punctures; dorsal area of propodeum oblique, triangle densely tessellate; propodeal corbicula well developed, pale ochraceous, with a dense anterior fringe; trochanteral floccus well developed, long and copious, pale ochraceous; hind tibiae rather slender, apex not quite twice width of basitarsi, pale ferruginous, scopa dense, hairs of moderate length, distinctly plumose, pale ochraceous but becoming fuscous toward base and along posterior margin; all basitarsi ferruginous, front and middle pair rather slender, slightly narrower than their respective tibiae; wings brownish-yellow, 2nd submarginal cell considerably shorter than 3rd, receiving 1st recurrent near apex; abdominal terga dull, densely tessellate, entirely impunctate, discal pubescence very sparse, short and obscure, entirely pale, terga 1-4 with entire, dense, ochraceous, apical fasciae, tergum 5 with a dark brownish apical fimbria.

MALE Length 9 mm.; head broad, distance from anterior ocellus to apical margin of clypeus about equal to distance between eyes; eyes parallel; vertex rather narrow, lateral ocelli separated from its hind margin by slightly more than their own diameter; cheeks broad and flat, conspicuously angulate, angle opposite middle of eye; clypeus rather flat, short and very broad, entirely yellow; small facial maculae between lower end of eye and inner angle of clypeus; face and vertex rather dull, punctures very fine and obscure; cheeks somewhat more shining, with exceedingly minute but rather close punctures; malar space linear; process of labrum very short, transverse, and labrum exceedingly short, fringed apically with long yellowish setae; basal segment of flagellum about half length of segment 2, this and the more apical segments nearly twice as long as broad; mandibles slender and exceedingly long, with a pronounced basal inferior tooth or angle, tip of one reaching basal angle of the other when closed, with a small, inner, subapical tooth about one-fourth from tip; pubescence of head, thorax and legs entirely bright ochraceous; scutum, scutellum, pleura and propodeum entirely densely tessellate and dull, with no visible punctures; all femora blackish, hind tibiae and apex of mid and front tibiae and all tarsi bright ferruginous or testaceous, hind spurs pale yellow; tegulae yellowish-hyaline; wings rather deeply infuscated, veins and stigma testaceous, 2nd submarginal cell about half length of 3rd; abdominal terga smooth but dull, with minute barely visible punctures; these rather close on segment 2, becoming quite sparse on 3 and 4, apical margins yellowish-hyaline, segments 1-5 with yellowish, rather narrow, apical fasciae; discal pubescence rather elongate on segments 1 and 2, short on the more apical segments, entirely pale and very thin; sternum 7 with a deep, subtriangular, median emargination; sternum 8 rather narrow basally, gradually narrowed to the subtruncate apex, clothed beneath with short, yellow pubescence; penis valves bulbous at base but not excavated, gonocoxites flattened and rather broadly dilated toward apex, gonocoxal lobes moderately produced, narrowly rounded.

TYPES - Holotype: Female, Orlando, Fla., March 1944 (R. & G. Bohart). [Bohart] Allotype: Alachua Co., Fla., March 3, 1956 (R. A. Morse) [Florida State Plant Board]. Paratypes: FLORIDA: 1 F. topotypical (Bohart); 1 F, 8 miles southeast of Interlachen, Mar. 2, 1953 (Howden & Dosier); 1 M, Pasco Co., Mar. 20, 1957 (H. V. Weems., Jr.). NORTH CAROLINA: 1 F, Statesville, Apr. 20, 1925 (T. B. Mitchell). NEW JERSEY: 1 F, Manumuskin, May 26, 1923 (J. C. Bradley). The females from North Carolina and New Jersey differ from the Florida specimens in having much paler pubescence, this being somewhat yellowish on head and thorax, but the abdominal fasciae almost white. Structurally there seem to be no significant differences. Paratypes are located in the collections of the State Plant Board of Florida, Cornell University, and the author.

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Updated: 2018-10-17 08:22:59 gmt
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