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Andrena bullata LaBerge, 1967
Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Callandrena_sensu_lato

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Reprinted with permission of the University of Nebraska State Museum from:
LaBerge, W. E. 1967. A revision of the bees of the genus Andrena of the Western Hemisphere. Part I. Callandrena (Hymenoptera: Andrenidae). Bulletin of the University of Nebraska State Museum 7: 1-316.

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This is a medium-sized species known only from Texas and related to asteris but not closely. It shares characteristics with irrasus (sculpture characters) and gardineri (sculpture and pale band of first tergum) and seems to tie these three species groups together. The female of bullata can easily be distinguished from that of asteris by the punctate terga. It can be told from the female of irrasus by the presence of a weak but distinct fascia on the first tergum and the more crowded tergal punctures. The female differs from that of gardineri by the larger facial foveae, the orange-red tibiae, the infumate wings and the plumose internal corbicular hairs. The male of bullata differs from the males of gardineri and asteris by the short first flagellar segment and the longer third flagellar segment as described below. In addition, the male has punctate, shagreened terga, yellow clypeus and parocular areas, reflexed apical margin of the sixth sternum, finely rugulose propodeal dorsal enclosure and the first tergum with a weak apical pale fascia.

FEMALE. MEASUREMENTS AND RATIOS. N = 9; length, 10-12 mm; width, 2.5-4.0 mm; wing length, M = 4.04 0.194 mm; FL/FW, M = 0.98 0.008; FOVL/FOVW, M = 2.40 0.035.

INTEGUMENTAL COLOR. Black except as follows: mandible with apical third rufescent; flagellar segments 3-10 brown below; tegulae translucent reddish-brown; wing membranes infumate, brownish, veins dark reddish-brown; terga 1-4 narrowly hyaline apically, slightly reddened basad of hyaline margins; sterna 2-5 with apices hyaline, rufescent just basad of hyaline margins; hind basitarsi usually orange at least mediobasally; hind tibiae orange-red; distitarsi often dark rufescent.

STRUCTURE. Antennae of moderate length, scape length equals first three and one-half flagellar segments; flagellar segment 1 equal in length to segments 2 plus 3, segment 2 distinctly shorter than 3, segment 3 slightly shorter than 4, segments 4-8 quadrate, 9-10 longer than broad. Eye about four times as long as broad, inner margins distinctly converging toward mandibles. Malar space linear. Mandible bidentate, angulate basoventrally but not lamellate; subgenal coronet present, well developed. Galea as in asteris. Maxillary palpus as in asteris but segmental ratio about 0.9:1.0:0.7:0.5:0.4:0.7. Labial palpus as in asteris but segmental ratio about 1.9:1.0:0.8:0.9. Labral process about twice as broad as long, bidentate. Clypeus evenly rounded from side to side; punctures round, small, separated mostly by one-half to one puncture width, surface dulled by delicate tessellation except apicomedially. Supraclypeal area with minute crowded punctures and fine shagreening dulling surface. Genal area in profile about as wide as eye; punctures small, separated mostly by one to two puncture widths or more; surface shiny, unshagreened or delicately so especially posteriorly. Vertex above lateral ocellus equals one ocellar diameter or slightly more; punctures crowded above ocelli and in narrow band above facial fovea, sparse elsewhere; surface moderately dulled by reticular shagreening. Facial fovea large, extending down to level of middle of antennal fossae or lower, flattened above, separated from lateral ocellus by half a puncture width or slightly more. Face above antennal fossae with longitudinal rugulae extending up between lateral ocellus and facial fovea; interrugal punctures crowded.

Pronotum as in asteris. Mesoscutum with shallow, round punctures, crowded peripherally, separated by one puncture width or more posteromedially, surface dulled by fine tessellation except moderately shiny posteromedially; parapsidal line as long as from its posterior end to margin of scutum. Tegulae normal, impunctate. Scutellum similar to mesoscutum but shinier. Metanotum opaque, with crowded punctures and fine tessellation. Propodeum with dorsal enclosure with sides straight to slightly concave, surface roughened by fine irregular rugulae and coarse tessellation; dorsolateral and posterior surfaces with large, shallow, contiguous punctures and fine tessellation; corbicular surface moderately shiny, with scattered punctures in upper two-thirds and coarse tessellation. Mesepisternum with large shallow irregular punctures crowded anteriorly, sparse posteriorly, surface dulled by fine tessellation. Metepisternum punctate in upper third, surface moderately shiny, reticularly shagreened. Middle basitarsus broad, sides evenly curved, broader than hind basitarsus. Wing venation as in asteris. Claws and tibial spurs normal.

Metasomal terga 1-4 with extremely narrow apical margins impunctate, apical areas otherwise with crowded coarse punctures; basally with round punctures separated by half to one puncture width, slightly sparser at extreme base of tergum 1 and more crowded on terga 3 and 4; surfaces moderately shiny, somewhat dulled by delicate reticular shagreening. Pygidial plate exceptionally broad basally, V-shaped with rounded apex. Sterna 2-5 with apices impunctate, basal area punctures separated mostly by two puncture widths, surfaces shiny, with delicate, coarsely reticular shagreening.

VESTITURE. Generally ochraceous except as follows: vertex of head and thoracic dorsum somewhat darker; terga 2-4 with basal area hairs fuscous; basitibial plate and scopal hairs just below plate dark brown; basitarsi and fore and middle tibiae with outer surfaces dark brown; inner surfaces basitarsi yellow to reddish-brown. Tergum 1 with complete, weak, apical, pale fascia. Terga 2-4 with pale apical fasciae weak and often narrowly interrupted medially on tergum 2. Propodeal corbicula incomplete anteriorly, with numerous internal plumose hairs. Scopal hairs plumose throughout. Coxal and trochanteral flocculi complete, well developed.

MALE. MEASUREMENTS AND RATIOS. N = 2; length, 10-11 mm; width, 3.0-3.5 mm; wing length, 3.68-4.22 mm; FL/FW, 0.97-1.01; FS1/FS2, 1.30-1.60.

INTEGUMENTAL COLOR. Black except as follows: mandible with apical third rufescent; clypeus yellow except small maculae mesad and below tentorial pits and dark brown apical margin; parocular area with large yellow macula but not extending to rear margin of clypeus; flagellar segments 2-11 dark reddish-brown below; tegulae translucent reddish-brown, veins reddish-brown; terga 1-5 with extremely narrow hyaline apical margins, slightly rufescent just basad of hyaline margins; sterna 2-5 with hyaline, yellowish apical margins; distitarsi, basitarsi and hind tibiae rufescent to orange-red.

STRUCTURE. Antennae of moderate length, slightly exceeding tegulae in repose; scape length equals first two and one-half flagellar segments; flagellar segment 1 longer than segment 2 and subequal in length to 3; segments 3-11 longer than broad. Eye one and one-third times as long as broad, inner margins strongly converging towards mandible. Malar space, galea and mandible as in female but mandibular basoventral angle and subgenal coronet absent. Maxillary palpus as in female but segmental ratio about 0.9:1.0:0.8:0.7:0.6:0.9. Labial palpus as in female but segmental ratio about 2.0:1.0:0.8:1.1. Labral process as in female but slightly deflected apically. Clypeus as in female but shinier, shagreening delicate, and punctures slightly sparser. Supraclypeal area, genal area, vertex and face above antennal fossae as in female.

Thoracic sculpturing and structure as in female except as follows: propodeal dorsal enclosure with rugulae slightly coarser and lateral surfaces dulled by coarse reticular shagreening. Terga 1-5 as in female terga 1-4. Pseudopygidial area present, narrow, distinct. Sterna 2-5 sculptured as in female but basal area punctures slightly sparser. Sternum 6 reflexed apically, apicolateral angles only slightly enlarged.

Genital capsule and sterna 7 and 8 (Figs. 154-158) similar to those of asteroides but note sternum 7 with extremely shallowly emarginate apex and sternum 8 with much expanded, essentially entire apex.

VESTITURE. Generally ochraceous except as follows: vertex and thoracic dorsum slightly darker ochraceous; terga 2-5 with basal areas with hairs short, suberect to erect, at least partly black; terga 6 and 7 pale ochraceous; sterna 3-5 with subapical fimbriae of long, suberect, pale ochraceous hairs; inner surfaces basitarsi golden-yellow.

TYPE MATERIAL. The holotype (PHT) female and three female paratypes (PHT; INHS) were collected in Brazos County, Texas, November 12, 1954, on Heterotheca subaxillaris, by A. H. Alex. The allotype (PHT) male was collected in the same place at the same time as the holotype female but on Gutierrezia texana. Five additional female and one male paratypes (INHS; USNM; SECK) from Texas are as follows: 1 female labeled "TEX, Birkmann." Lee County. 1 female, October, 1908. Fedor, Lee County. 5 females, 1 male, Birkmann.

Scientific source:

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FamilyScientific name @ source (records)
Asteraceae  Aster sp @ BBSL (1)

Heterotheca pilosa @ BBSL (1)

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Updated: 2024-04-19 22:01:51 gmt
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