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Andrena furva Linsley & MacSwain, 1961
Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Onagrandrena


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Overview
Text used courtesy of the Illinois Natural History Survey from: LaBerge, W. E., Thorp, R. W., 2005. A revision of the bees of the genus Andrena of the Western Hemisphere. Part XIV. Subgenus Onagrandrena. Illinois Natural History Survey Bulletin 37: 1-63.

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The female of Andrena furva is similar to that of omninigra and related species but has entirely black vestiture and short dorsal thoracic hairs. The male of furva was unknown and a complete description is supplied below. This male is one of those species with entirely white vestiture and has the galeae small and shiny as in Andrena blaisdelli, but differs from that species by the longer vertex, shorter first flagellar segment, and shorter, more distinct sternal fimbriae as described below.

FEMALE: MEASUREMENTS AND RATIOS. N = 20; length, 10-11 mm; width, about 3 mm; WL, M = 3.20 0.120 mm; FL/FW, M = 0.97 0.004; FOVL/FOVW, M = 3.01 0.044.

DIAGNOSIS. Vestiture black; wing membranes hyaline, not infumate or only slightly so, veins dark brown; metasomal terga black without metallic reflections. Galeae short, narrow, shiny, slightly shagreened in apical halves or less or unshagreened. Labral process with apical part narrow, sides strongly concave, apex usually deeply emarginate; clypeus with round crowded punctures, without impunctate midline or this incomplete and narrow; vertex above lateral ocellus equals one ocellar diameter or rarely slightly more. Pronotum without dorsal angle or lateral ridge. Mesoscutum and scutellum with small dense punctures separated mostly by half a puncture width, interpunctural spaces dulled by fine shagreening (Fig. 9). Propodeum with distinct dorsal surface; dorsal enclosure coarsely, irregularly rugulate; surface outside of enclosure moderately coarsely punctatorugose. Mesepisterna coarsely punctatorugose. Metasomal terga 2 and 3 with basal areas with punctures round, deep, crowded, separated mostly by half a puncture width, slightly sparser near apical area, apical areas with apical half impunctate, basal half punctured similar to basal areas; surfaces shiny, unshagreened. Thoracic dorsum with hairs short, moss-like, shorter than width of antennal scape; propodeum with corbicula as in flandersi; scopal hairs simple, abundant.

MALE: MEASUREMENTS AND RATIOS. N = 20; length, 8-11 mm; width, 2.5-3.0 mm; WL, M = 3.17 0.172 mm; FL/FW, M = 1.07 0.007; FS1/FS2, M = 1.04 0.013.

INTEGUMENTAL COLOR. Black except as follows: mandible with apical fourth rufescent, terga with apical areas piceous, wing membranes hyaline, not or only slightly infumate.

STRUCTURE. Antennae relatively short, in repose not reaching scutellum; scape length equals first two and one-half flagellar segments; flagellar segment 1 about as long as segment 2 or slightly longer, usually shorter than segment 3; segments beyond 3 all slightly longer than broad. Eyes each almost three times as long as broad, inner margins diverging towards vertex. Mandibles not decussate. Galeae as in female. Maxillary palpus short, with segmental ratio about as 1.0: 1.0: 0.8: 0.8: 0.6: 0.8. Labial palpus with ratio about as 1.0: 0.3: 0.3: 0.5. Labral process large, deeply emarginate, strongly reflexed; labrum apical to process without sulcus or cristae. Clypeus moderately long, median length equals about half or slightly less of interocular width; densely punctate, interpunctural surfaces shiny, without median impunctate line. Supraclypeal area dulled by minute punctures and shagreening. Face above antennal fossae with longitudinal rugulae, diverging medially towards ocelli; vertex above lateral ocellus equals slightly more than one ocellar diameter, never less than one. Genal area slightly broader than eye in profile, shiny, punctate except in narrow zone near eye margin.

Pronotum without humeral angles or lateral ridge. Mesoscutum and scutellum with crowded punctures, surface dulled by shagreening except scutellum occasionally moderately shiny. Propodeum sculptured as in female but dorsal enclosure with rugulae fine; mesepisterna punctatorugose as in female.

shorter than width of antennal scape: propodeum with corbicula as in flandersi; scopal hairs simple, abundant.

MALE: MEASUREMENTS AND RATIOS. N = 20; length, 8-11 mm; width, 2.5-3.0 mm; WL, M = 3.1710.172 mm; FL/FW, M = 1.0710.007; FS1/FS2, M = 1.04 0.013.

INTEGUMENTAL COLOR. Black except as follows: mandible with apical fourth rufescent, terga with apical areas piceous, wing membranes hyaline, not or only slightly infumate.

STRUCTURE. Antennae relatively short, in repose not reaching scutellum; scape length equals First two and one-half flagellar segments; flagellar segment I about as long as segment 2 or slightly longer, usually shorter than segment 3; segments beyond 3 all slightly longer than broad. Eyes each almost three times as long as broad, inner margins diverging towards vertex. Mandibles not decussate. Galeae as in female. Maxillary palpus short, with segmental ratio about as 1.0: 1.0: 0.8: 0.8: 0.6: 0.8. Labial palpus with ratio about as 1.0: 0.3: 0.3: 0.5. Labral process large, deeply emarginate, strongly reflexed; labrum apical to process without sulcus or cristae. Clypeus moderately long, median length equals about half or slightly less of interocular width; densely punctate, interpunctural surfaces shiny, without median impunctate line. Supraclypeal area dulled by minute punctures and shagreening. Face above antennal fossae with longitudinal rugulae, diverging medially towards ocelli; vertex above lateral ocellus equals slightly more than one ocellar diameter, never less than one. Genal area slightly broader than eye in profile, shiny, punctate except in narrow zone near eye margin.

Pronotum without humeral angles or lateral ridge. Mesoscutum and scutellum with crowded punctures, surface dulled by shagreening except scutellum occasionally moderately shiny. Propodeum sculptured as in female but dorsal enclosure with rugulae fine; mesepisterna punctatorugose as in female.

Metasomal terga 2-5 with basal areas punctate, punctures separated by half to one or two puncture widths, surfaces shiny, shagreening slight, if present; apical areas with punctures at least in basal halves, shiny. Tergum 7 with distinct, narrow, triangular pseudopygidial areas, lateral edges often turned slightly up. Sterna 2-5 with basal areas distinctly punctate, punctures separated mostly by 2 to 3 puncture widths, surfaces moderately shiny; apical areas impunctate. Sternum 7 with apical lobe elongate, weakly emarginate, with sparse, fine hairs; Sternum 8 strongly capitate apically, neck region with abundant hairs but not covering apical margin (Figs. 37 and 38).

VESTITURE. White except vertex occasionally with a few yellowish brown hairs and hind basitarsi with inner surfaces with pale yellow hairs. Clypeus with dense beard; hind basitarsus with hairs along anterior margin moderately long; sterna 2-5 with dense subapical fimbriae of relatively short hairs.

TYPE MATERIAL. The holotype female of Andrena (O.)furva (CAL No. 6,703) was collected 4.5 miles NE of Santa Margarita, San Luis Obispo County, California, April 28, 1959. by J. W. MacSwain.

DISTRIBUTION. This species is known only from southern California (Linsley, MacSwain, Rozen, and Thorp, 1973, p. 33) (Fig. 4). It has been collected from April 14 through May I. in addition to the holotype, a total of 22 females and 23 males were examined from localities listed below.

CALIFORNIA. LOS ANGELES CO.: Altadena; Claremont; La Crescenta. RIVERSIDE CO.: Elsinore (4 mi. E in Railroad Canyon). SAN BENITO CO.: Pinnacles Nat. Monument. SAN BERNARD1NO CO.: Deep Creek: Fontana (4 mi. N). SAN DIEGO CO.: Descanso-Alpine transect; Frey Creek, Pauma Valley. SAN LUIS OBISPO CO.: La Panza Camp (12 mi. NE of Pozo); Santa Margarita (4.5 mi. N and 5 mi. NE).

FLORAL RECORDS. Andrena furva has been collected from flowers of the following plants.

Camissonia campestris, C. contorta, Clarkia cylindrica, Cryptantha sp. and C. intermedia.

Names
Scientific source:

References
Andrena (Onagrandrena) furva Linsley and MacSwain, 1961, Pan-Pacific Ent., 37: 117-118; Linsley, MacSwain, and Raven, 1964, Univ. California Publ. Ent., 33: 64, 73, 79; Linsley, MacSwain, Raven, and Thorp, 1973, Univ. California Publ. Ent., 71: 26, 27, 32-33, 47, 51, 56; MacSwain, Raven and Thorp, 1973, Univ. California Publ. Ent., 70: 46.

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