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Andrena quintilis Robertson, 1898
Trachandrena quintilis (Robertson, 1898)

Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Trachandrena

Andrena quintilis FEM mm .x f
© Copyright Laurence Packer 2014 · 7
Andrena quintilis FEM mm .x f

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Andrena quintilis MALE CFP
© Copyright Laurence Packer 2014 · 7
Andrena quintilis MALE CFP
Andrena quintilis, female, face
© Rebekah Andrus Nelson · 1
Andrena quintilis, female, face
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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Andrena quintilis is a distinctive species closely related to A. quintiliformis Viereck. Both sexes of quintilis are distinctive in the relatively long, narrow, pointed galeae. Both sexes are like quintiliformis in the short tergal apical areas, the closely punctate terga and the high vertex. The females have the same angular base on the anterior femora and the scalelike thoracic hairs but differ in lacking brown hairs on the thorax and terga. Both sexes of quintilis differ from quintiliformis in the more coarsely rugose propodeum and the more sparsely punctate basal area of the first tergum.

FEMALE. MEASUREMENTS AND RATIOS. N = 20; length, 9-11 mm; width, 3.0-3.5 mm; wing length, M = 3.83 0.153 mm; FL/FW, M = 1.08 0.005; FOVL/FOVW, M = 3.35 0.040.

INTEGUMENTAL COLOR. Black except as follows: mandible with apical third to almost entirely dark rufescent; flagellar segments dark brown below; tegulae dark rufescent; wing membranes moderately infumate, yellowish-brown, veins dark reddish-brown; terga 1-5 often with narrow apical margins hyaline, often dark rufescent in apical areas; sterna with apical areas hyaline to smoky; distitarsi and tibial spurs rufescent.

STRUCTURE. Antennae as in sigmundi. Eyes each about three and one-half times as long as broad, inner margins parallel. Malar space and mandible as in sigmundi. Galea long and rather narrow, extended forwards about as long as maxillary palpus or slightly shorter, palpus does not exceed galea by more than length of last segment, usually less, broadest near base and tapering to acute apex (in other species galea is broadest at or beyond middle and tapers more rapidly to apex); sculptured as in sigmundi. Maxillary palpus with segmental ratio about as 0.9:1.0:0.7:0.7:0.6:0.8. Labial palpus as in sigmundi but segmental ratio about as 1.0:0.6:0.6:0.6. Labral process as in sigmundi; labrum apical to process not sulcate, without cristae. Clypeus as in sigmundi but median impunctate line indistinct to absent, punctures usually slightly sparser medially. Supraclypeal area as in sigmundi but punctures more crowded. Genal area as in quintiliformis. Vertex as in quintiliformis but surface often shiny, only delicately shagreened. Face above antennal fossae with coarse round or elongate punctures separated by half a puncture width or slightly more medially, contiguous laterally, surface shiny, delicately shagreened. Facial fovea separated from lateral ocellus by half to three-fourths an ocellar diameter, otherwise as in sigmundi.

Thoracic sculpture as in quintiliformis except propodeum with dorsolateral and posterior surfaces coarsely reticulorugose. Posterior hind tibial spur normal. Anterior femur as in quintiliformis. Wing venation as in sigmundi.

Metasomal sculpturing as in quintiliformis except tergum 1 with basal area punctures separated largely by one puncture width or slightly more. Pygidial plate V-shaped with broadly rounded apex and distinct internal raised triangular area.

VESTITURE. Generally white to pale ochraceous but terga 5 and 6 golden and inner surfaces tarsi yellow. Form and arrangement of hairs as in quintiliformis except as follows: short scalelike hairs of thoracic dorsum mostly erect to suberect; tergum 4 and often tergum 3 with apical white fascia complete (usually narrower medially); tergum 2 with apical white fascia narrowly interrupted medially.

MALE. MEASUREMENTS AND RATIOS. N = 20; length, 8-10 mm; width, 1.5-3.0 mm; wing length, M = 3.34 0.205 mm; FL/FW, M = 1.18 0.006; FS1/FS2, M = 0.82 0.012.

INTEGUMENTAL COLOR. Black except as follows: mandible with apical third or more rufescent; flagellar segments dark brown below; wing membranes hyaline, moderately infumate, yellow to yellowish-brown, veins and tegulae red to dark reddish-brown; terga 1-5 with narrow apical rim hyaline, colorless to yellow; sterna with apical areas yellow-hyaline to rufescent; distitarsi and tibial spurs rufescent.

STRUCTURE. Antennae in repose barely reaching metanotum or shorter; scape length equal to first two flagellar segments or slightly more; flagellar segments as in quintiliformis but segments 2-10 slightly shorter. Eyes each about three and one-fourth times as long as broad, inner margins converging slightly toward mandibles. Malar space, mandible and galea as in female. Maxillary palpus as in female but segmental ratio about as 0.9:1.0:0.7:0.7:0.6:0.7. Labial palpus as in female but ratio about as 1.0:0.5:0.5:0.6. Labrum as in sigmundi. Clypeus and supraclypeal area as in female. Vertex and face as in female but face with punctures more crowded. Genal area as in female, laterally without rugulae.

Thoracic sculpturing as in quintiliformis except propodeum with dorsolateral and posterior surfaces coarsely reticulorugose. Wing venation and tibial spurs as in female. Anterior femur normal at base.

Metasomal sculpturing as in quintiliformis except tergum 1 with basal area punctures less crowded, separated largely by half to one puncture width or more. Terminalia as in sigmundi but sees figures 32-33.

VESTITURE. Generally white or pale ochraceous and distributed as in quintiliformis except as follows: without brown hairs on vertex, thorax or metasomal terga; terga 3 and 4 (and usually 5) with complete apical white fasciae, narrower medially than laterally, occasionally narrowly interrupted medially on tergum 3; tergum 2 with apical white fascia narrowly interrupted medially; terga 6 and 7 with pale pubescence white to pale yellow.

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.; length of face greater than distance between eyes; eyes parallel; foveae abruptly and narrowly constricted below, separated from eye margin by a space nearly as wide; vertex rather broad, lateral ocelli separated from its hind margin by about twice their diameter; cheeks slightly broader than eyes; clypeus shining between rather close, deep and distinct but rather fine punctures, protruding nearly one-half below suborbital line; face between antennae and ocelli rather coarsely rugoso-punctate, vertex shining, with deep, distinct but well separated punctures, those on cheeks very close and fine; malar space hardly evident; process of labrum truncate, median length about half the basal width; basal segment of flagellum nearly equal to segments 2 and 3 combined, median segments about as broad as long; pubescence of head and thorax rather short, whitish, quite dense between antennae and lower portions of foveae, and rather dense on cheeks below, very short and rather dense, scale-like and densely plumose on scutum and scutellum, becoming more loose and erect on pleura and propodeum, somewhat yellowish on thorax dorsally, especially around tegulae and tubercles; scutum and scutellum somewhat shining, punctures of scutum deep and distinct, rather coarse and close but not crowded, becoming somewhat more widely separated posteriorly, those on scutellum somewhat more coarse and sparse; pleura dull, densely rugoso-punctate; dorsal area of propodeum rather coarsely striate, lateral portions coarsely rugose, propodeal corbicula quite short, with a short anterior fringe; trochanteral floccus short and poorly developed; legs dark, the more apical tarsal segments somewhat reddened, spurs yellowish, pubescence entirely whitish, tibial scopa quite dense and entirely white; wings lightly infuscated, veins and stigma reddish-piceous, 2nd submarginal cell about half length of 3rd, receiving 1st recurrent near middle; tegulae yellowish-hyaline, becoming more piceous anteriorly; abdominal terga deeply, distinctly and rather coarsely punctate, punctures well separated but not sparse on basal tergum, but close on the following segments, segment 2 impressed for nearly half its length medially, 3rd and 4th impressed for about one-third their median length, each segment becoming narrowly yellowish-hyaline apically, 2-4 with dense but rather narrow, white, apical fasciae, that on 2 somewhat interrupted medially, apical fimbria whitish.

MALE. Length 9 mm.; face slightly longer than distance between eyes above; eyes slightly convergent below; space separating lateral ocelli from margin of vertex slightly greater than their diameter; cheeks subequal to eyes in width; clypeus strongly convex, protruding one-half below suborbital line, coarsely, deeply, uniformly and quite closely punctate; face below ocelli coarsely rugoso-punctate, vertex with distinct, coarse and deep punctures, close near center, more sparse between eyes and ocelli, becoming close and somewhat finer on cheeks; malar space very short; process of labrum broadly subtriangular, truncate apex slightly longer than each oblique side, twice or more as broad as median length; flagellum reddish-piceous, basal segment hot much longer than broad, segment 2 much longer, median segments nearly twice as long as broad; mandibles quite short, with a distinct, subapical, inner tooth; pubescence of head and thorax pale ochraceous, without dark admixture, rather short but erect, quite dense around antennae, on cheeks below and over most of thorax; scutum and scutellum shining, punctures uniformly close, coarse and deep, almost crowded on scutellum, pleura coarsely rugose, dorsal area of propodeum rather short, coarsely and irregularly striate, lateral and posterior faces coarsely reticulate; propodeal corbicula rather poorly developed; legs piceous, apical tarsal segments more or less reddened, pubescence short, entirely pale, basitarsi slender and elongate; wings lightly infuscated, veins and stigma ferruginous, 2nd submarginal cell short, receiving 1st recurrent vein slightly beyond middle; abdominal terga shining, impressed for somewhat more than a third the median length, punctures uniformly close, coarse, deep and distinct, very slightly closer and finer on apical impressed areas, rims very narrowly hyaline, apical fasciae yellowish-white, narrow and rather poorly developed, discal pubescence short and thin, entirely pale; sternum 7 not produced medially, but with a very small, median, triangular emargination; apical portion of sternum 8 rather short, length about equal to that of basal portion, pubescence quite dense, tip slightly constricted, truncate apically; penis valves slender apically, base somewhat bulbous, strongly flexed, sides excavated; gonocoxites broadly dilated apically, inner margin of this area transverse, the gonocoxal lobes strongly produced, subtriangular and acute, flexed and nearly attaining transverse margin of apical lobes (similar to hippotes, fig. 37).

DISTRIBUTION. Illinois to Iowa and South Dakota; July.

FLOWER RECORDS. Pycnanthemum linifolium and P. flexuosum.

Extracted from Joel Gardner. "The mining bees of Minnesota (unpublished manuscript)"

Female Andrena quintilis have unusually short, very densely plumose hairs of the upper thorax, appearing somewhat thickened, and both sexes have dense, complete or nearly complete apical hair bands on the terga. This species is oligolectic on Amorpha and apparently restricted to the western prairie region of Minnesota.

Scientific source:

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FamilyScientific name @ source (records)
Fabaceae  Amorpha canescens @ AMNH_BEE (1)

Dalea candida @ AMNH_BEE (1)

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Updated: 2018-09-21 12:34:36 gmt
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