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Andrena parachalybea Viereck, 1917
Andrena (Parandrena) parachalybea Viereck, 1917

Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Diandrena


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Reprinted by permission of the Regents of the University of California from: Thorp, R. W. 1969. Systematics and ecology of bees of the subgenus Diandrena (Hymenoptera: Andrenidae). University of California Publications in Entomology 52: 1-146.

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This species is most closely related to A. chalybaea and more distantly to A. cuneilabris and A. foxii. It may be separated from A. chalybaea by the characters enumerated in the diagnosis of that species. From A. cuneilabris it is readily distinguished by the rugose-punctate scutellum and broader labral process; and from A. foxii by the bluish integument of the head and mesosoma and the shallowly emarginate labral process.

There is no consistent morphological variation between populations of this species; however, there is some individual variation in the degree of emargination of the apex of the labral process.

FEMALE. Integument blue; antenna uniformly dark brownish-black, clypeus with a subapical median dark violaceous triangle, forewing with stigma mahogany; pubescence pale, white on face, antennal scape, vertex and gena, dark brown, to black laterally on face and above eye, pale brown at apex of clypeus, white on mesosoma, outer surface of tibial scopa white anteriorly, dark brown posteriorly, white on metasoma, anal fimbria light violaceous-gray; facial fovea with gray-brown sheen, tomentum brown above, white below. Head rugulose, densely punctate; clypeus, latero- and supraclypeal areas moderately coarsely, closely punctate with shining, finely tessellate interspaces, punctures separated by less than one diameter; facial fovea extending from summit of eye to below antennal base; eye slightly arcuate medially; antenna with segments 1 to 3 of flagellum as 14: 6: 7; labrum with process broad, apically shallowly emarginate (fig. 5); subgenal coronet long, well developed; gena rugulose laterally to somewhat coarsely striate posteroventrally; pubescence of clypeus suberect. Mesosoma coarsely, closely, rugose-punctate interspaces and punctures shiny; pronotum finely, transversely striate with coarse punctures, dorsolateral angle obtusely angulate, slightly elevated with a thickened lateral fold; mesoscutum with punctures nearly contiguous, separated by thin ridges, notaulus moderately distinct depression; scutellum and metanotum with punctures larger, nearly contiguous; propodeum shiny, rugose-punctate, enclosure irregularly rugose with distinct median longitudinal carina; episternum 2 rugose-punctate; wing slightly infuscated, submarginals 1:2 (20:22), stigma : rest of marginal cell (18:28), hind wing with jugal lobe broad and with incision between it and vannal, reaching beyond level of cu-v; posterior trochanter with long, curved, white, perfect floccus; tibial scopa long, loose, simple except for narrow band of plumose hairs along inner posterior margin, posterior hairs of scopa about one and one-half times as long as width of tibia at apex; pubescence of mesoscutum long, pale. Metasoma shiny, tessellate-punctate; first tergum with irregularly spaced, largo punctures with anterior margins elevated like tilted craters; terga 2 to 4 with punctures of basal elevations smaller and more regularly spaced, separated by less than one diameter, with interspaces shiny and resembling delicate irregularly imbricate disks, punctures fewer, smaller, more scattered on apical depressed margins, with fine transverse striae; pubescence of tergum 1 long, erect, sparse, successively shorter on succeeding segments, that of tergum 1 three times as long as that of tergum 2. Length 10 to 11 mm, forewing 7.5 to 8.5 mm.

MALE. Integument blue; antenna uniformly dark brownish-black, clypeus with short, median, subapical, triangular dark area with violaceous reflections, forewing with stigma mahogany; pubescence pale, white on clypeus, frons, antennal scape, vertex, lower three-fourths of gena, black on face laterally, in narrow band along inner margin of eye, above eye, and on dorsal fourth of gena and thin band along outer margin of eye, anal fimbria purple-brown. Seat tessellate, densely punctate; clypeus, latero- and supraclypeal areas coarsely, contiguously punctate with shiny, fine ridges between punctures; parocular depression linear, reaching down to level of antennal base; eyes slightly convergent below; antenna with segments 1 to 3 of flagellum as 13:10:12; labrum with process broad, emarginate and recurved at apex (fig. 6); mandible long, decussate; gena somewhat coarsely, transversely striate laterally becoming more coarsely striate ventrally; pubescence of clypeus long, dense, and subdepressed. Mesosoma coarsely, contiguously, deeply punctate with edges of punctures raised and with ridges between punctures shiny; pronotum finely, transversely striate with punctures separated by one diameter, dorsolateral angle right-angled, somewhat elevated with thickened lateral fold; mesoscutum with notaulus moderately distinct depression; punctures of mesoscutum, scutellum, and metanotum contiguous, increasing in size posteriorly; propodeum shiny, rugose-punctate, enclosure irregularly rugose with distinct median, longitudinal carina; episternum 2 rugose-punctate; wings pale, submarginals 1:2 (34:38.5), stigma : rest of marginal cell (17: 24), hind wing with jugal lobe broad and with incision between it and vannal, reaching beyond level of cu-v; pubescence of mesoscutum long, pale. Metasoma shiny, tessellate-punctate; tergum 1 with irregularly spaced large punctures with anterior margins elevated like tilted craters; terga 2 to 4 with punctures of basal elevations smaller and more regularly spaced, separated by less than one diameter, with interspaces shiny and resembling delicate irregularly imbricate disks, punctures fewer, smaller, more scattered on apical depressed margins, with fine transverse striae; pubescence pale, long, erect on tergum 1, half as long, erect on tergum 2, on terga 3 to 5 half as long as on tergum 2, erect on basal elevations, suberect on apical margins. Length 8 to 8.5 mm, forewing 6.5 to 7 mm.

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Updated: 2018-02-20 16:10:58 gmt
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