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Tetraloniella flagellicornis (Smith, 1879)
Tetralonia flagellicornis Smith, 1879

Life   Insecta   Hymenoptera   Apoidea   Apidae   Tetraloniella
Subgenus: Tetraloniella

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Extracted from: Wallace E. LaBerge. 2001. Revision of the bees of the genus Tetraloniella in the New World (Hymenoptera: Apidae). Illinois Natural History Survey Bulletin 36(3):67–162.

This is a moderate-sized species from Mιxico. The female is similar to that of T. donata and fastigiata but the antennae are black or dark reddish brown below. The female has shiny galeae, the mesoscutum dulled by shagreening but often moderately shiny posteromedally and terga 2–4 with apical pale bands complete and covering apical margin. The male of flagellicornis also has the long antennae dark reddish brown to black below, the mandibles each with a basal pale spot, the labrum mostly pale, and the clypeus with the apical half pale.

FEMALE. Measurements and Ratios.- N = 20; length, 10.0–11.5 mm; width, 3.5–4.5 mm; wing length, M = 3.17±0.090 mm; hooks in hamulus, M = 12.00±0.218; flagellar segment 1/2, M = 2.00±0.029.

Integumental Color.- Black except as follows: mandible with apical half rufescent, usually with golden macula; flagellar segments below black to dark blackish brown; tegulae piceous, occasionally slightly translucent at summit; wing veins dark brown to black, membranes hyaline, colorless, or slightly infumate; metasomal terga and sterna, distitarsi, and tibial spurs as in cressoniana.

Structure.- Clypeus gently curved from side to side; oculoclypeal distance distinct, less than minimum width first flagellar segment; punctures coarse, deep, separated mostly by half a puncture width, surface shiny except peripherally. Supraclypeal area with smaller punctures, dense laterally, sparse medially, surface dull, finely shagreened. Face above antennal fossae with relatively small, deep punctures, surface dulled at least in median third by fine shagreening. Vertex laterally with minute punctures separated mostly by one puncture width or more, surface shiny. Genal area narrow, minutely punctate, and dull. Galea shiny above; maxillary palpal segments 6, ratio about as 1.0:1.0:1.0:0.7:0.3:0.3. Flagellar segment 2 usually slightly shorter than broad or not longer; segments 3–9 as broad as long or slightly longer. Mesoscutum in anterior third and peripherally with minute obscure punctures, surface dulled by dense reticular shagreening; posteromedian area with punctures larger, separated mostly by half a puncture width or slightly more, surface shiny to slightly dulled by weak shagreening. Scutellum with small round punctures, surface moderately shiny to dull, shagreening often absent medially. Propodeum densely punctate except medially, surface dulled by fine tessellation. Mesepisternum with round punctures separated mostly by half to one or more puncture widths, surface dulled by distinct tessellation. Metasomal terga sculptured as in cressoniana except as follows: tergum 1 with median third punctures separated largely by two puncture widths. Pygidial plate broadly V-shaped with rounded apex. Terga 2–4 with interband zone punctures well separated in median third and crowded laterally; sterna sculptured as in cressoniana.

Vestiture.- Pale ochraceous to almost white except as follows: vertex with abundant long dark brown to black hairs; mesoscutal hairs dark brown to black except peripherally; scutellum with hairs mostly dark brown to black; mesoscutum and scutellum often with fox-red hairs with reddish brown posteromedian or median patches; metasomal tergum 1 with apical area hairs short dark brown; terga 2–4 with interband zones with brown hairs or at least some dark erect hairs mixed with pale, with basal area tomentum pale, apical pale fasciae complete and reaching apical margin of each tergum; tergum 5 with hairs dark brown except small lateral pale patches; tergum 6 dark brown; sterna 2– 5 with median hairs short, erect, weakly plumose reddish brown, apicolaterally hairs becoming longer, more plumose, less erect, and pale; sternum 6 with hairs dark brown; hind tibia with tibial plate and below covered with short dark brown hairs. Scopal hairs long, simple, white, or pale ochraceous.

MALE. Measurements and Ratios.- N = 16; length, 9–11 mm; width, 2.5–3.5 mm; wing length, 2.45±0.298 mm; hooks in hamulus, M = 11.00±0.204; flagellar segment 2/1, M = 6.72±0.117.

Integumental Color.- Black except as follows: labrum often with white macula equal to more than one-third of labrum margin black, but often entirely black; mandible usually with basal cream-colored macula; clypeus with apical half cream-colored; flagellar segments dark reddish brown to black below; tegulae and wings as in female; metasomal terga and sterna as in female; distitarsi dark reddish brown to red especially apically.

Structure.- Head sculpture much as in female but facial area above antennal fossae and vertex with punctures smaller and more dense. Antennae long, reaching second or third metasomal terga in repose, first flagellar segment one-sixth to one-eighth as long as second. Galea shiny above, unshagreened except near apex; maxillary palpus 6-segmented, ratio about as 1.0:1.0:1.0:0.5:0.3:0.3. Thoracic sculpture as in female but mesoscutum often somewhat dulled posteromedially by fine shagreening. Metasomal tergum 1 with basal area with punctures separated mostly by 2 puncture widths in median half, more crowded laterally; apical area with basal half densely punctate, apical half impunctate, moderately shiny, finely shagreened. Terga 2 and 3 with interband zones with dense round punctures, surface moderately shiny; apical areas with basal halves finely punctate, apically impunctate. Terga 4 and 5 similar to 2 and 3 but punctures in interband zones slightly more dense. Pygidial plate blunt, trapezoidal, slightly broader at base than at apex, without subapical notches, margins near apex curved upwards. Sterna 2–5 with basal areas punctate, punctures separated mostly by one puncture width or slightly more, surface moderately shiny, finely shagreened; apical areas impunctate, moderately shiny. Sternum 6 (Fig106) flat, with weak subapical carinae, sparsely punctate, with strong apicolateral shoulders; note hair pattern. Terminalia (Figs. 106–110) similar to fastigiata (Figs. 97–100).

Vestiture.- Generally ochraceous to pale ochraceous except as follows: vertex, mesoscutum, and scutellum often with dark brown hairs but occasionally entirely pale, occasionally fox-red with or without brown patches; metasomal tergum 1 with basal area hairs long, pale ochraceous, apical area hairs short, dark brown; terga 2 and 3 with basal tomentum white, apical areas with white apical fasciae complete, covering apical margins, interband zones with erect dark brown hairs; terga 4 and 5 similar but basal tomentum dark brown; terga 6 and 7 with vestiture dark brown; sterna 2–5 with median hairs relatively short, reddish brown, laterally becoming longer and white; sternum 6 with hairs sparse, extremely short, dark; inner surfaces tarsi golden.

Scientific source:

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Updated: 2018-09-23 20:54:50 gmt
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