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Tetraloniella michoacanensis LaBerge, 2001
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 moderately large species from Mιxico and the southernmost United States is similar to cressoniana and flagellicornis in the simple scopal hairs, the usually 6-segmented maxillary palpi, and the well-defined tergal apical pale fasciae. The female of michoacanensis differs from that of either cressoniana or flagellicornis by metasomal terga 2 and 3 having the apical pale fasciae distinctly separated from the apical edge of each tergum by a narrow, shiny, impunctate rim and by a narrow basal zone of each apical area being impunctate (this is especially distinct on tergum 3). The male of michoacanensis has the apical half of the clypeus, base of mandibles, and labrum with pale (cream-colored) maculae much as in flagellicornis (rarely the labrum or the mandibles have the pale maculae reduced or absent). The male of michoacanensis has metasomal terga 2, 3, and 4 with apical margins narrowly exposed as in terga 2 and 3 of the female.

FEMALE. Measurements and Ratios.- N = 20; length, 10–12 mm; width, 4.0–4.5 mm; wing length, M = 2.97±0.104 mm; hooks in hamulus, M = 13.60±0.210; flagellar segment 1/2, M = 2.11±0.018.

Integumental Color.- Black except as follows: mandible with median third or less rufescent, often with apicomedian golden stripe (absent when worn); flagellum dark reddish brown to black below; tegulae piceous; wing membranes hyaline, moderately infumate, veins dark blackish brown; metasomal terga with apical rims piceous, often slightly translucent, never hyaline; sterna with apical areas hyaline to translucent; distitarsi dark reddish brown to black; tibial spurs testaceous.

Structure.- Clypeus evenly rounded from side to side, coarsely punctate with small median ridge or apicomedian boss, surface moderately shiny, finely shagreened. Supraclypeal area with deep round punctures separated by half a puncture width laterally, slightly sparser medially, surface dull, finely tessellate. Face above antennal fossae with small round punctures separated largely by half a puncture width or less, surface moderately shiny. Vertex with lateral flattened areas with minute round punctures separated largely by half to one puncture width, surface shiny. Genal area narrow, minutely punctate, moderately shiny. Galeae without shagreening except near tips, shiny; maxillary palpus 6-segmented, segmental ratio about as 1.0:0.8:1.0:0.5:0.4:0.2. Second flagellar segment about as long as broad, half as long as first segment. Mesoscutum with peripheral area with crowded punctures separated mostly by less than half a puncture width, posteromedially punctures separated by half to one puncture width, surfaces dull to moderately dull, finely tessellate; scutellum similar but punctures smaller, surface moderately shiny. Propodeum with dorsal surface punctatorugose, dulled by fine shagreening; posterior surface with crowded punctures laterally, impunctate dorsomedially, surface dull, shagreened. Mesepisternum with round punctures separated by half a puncture width or slightly more, surface dull, finely tessellate. Metasomal tergum 1 with basal area punctures small, round, in median half separated largely by one to two puncture widths, more crowded laterally; apical area largely impunctate, surface moderately dulled by fine shagreening. Tergum 2 and 3 with extreme basal depressed area with minute crowded punctures, surface moderately shiny, interband zone (disc) with punctures large, separated by half to one puncture width medially, more crowded laterally, surface dulled by fine shagreening; apical area with apical rim impunctate, basal fourth or fifth impunctate, median third to half with small round crowded punctures, surface dull, shagreened but apical impunctate rim moderately shiny; tergum 4 similar but apical rim not exposed. Pygidial plate V-shaped with broadly rounded apex. Sterna 2–4 as in cressoniana.

Vestiture.- Pale ochraceous to white except as follows: vertex and thoracic dorsum often with pale hairs ferrugineous but usually with abundant dark brown hairs; tegulae often with some dark hairs; tergum 1 with basal area with long pale hairs, apical area with hairs, if present along basal margin, short, dark brown; terga 2 and 3 with basal tomentum white or mostly white, interband zone hairs short, dark brown, apical pale fascia complete, not covering shiny apical rims of terga, with basal margin irregular and not reaching bases of apical areas; tergum 4 similar but apical fascia narrow and completely hiding apical rim; tergum 5 dark brown except small lateral white patches; tergum 6 dark brown. Sterna 2–5 as in cressoniana.

MALE. Measurements and Ratios.- N = 20; length 9–12 mm; width, 2.5–3.5 mm; wing length, M = 2.90±0.098 mm; hooks in hamulus, M = 12.35±0.209; flagellar segment 2/1, M = 7.00±0.120.

Integumental Color.- Black except as follows: mandible usually with small pale basal macula; labrum usually white with dark brown apical border, often pale spot is onethird or less of labrum and rarely labrum entirely dark; clypeus with subapical half or less cream-colored; flagellar segments black to dark reddish brown below; wing membranes and veins as in female; terga, sterna, distitarsi, and tibial spurs as in female but terga with apical rims often translucent, brown to yellow.

Structure.- Head with sculpturing as in female except as follows: clypeus often shiny, especially apicomedially; vertex with lateral flattened areas with punctures often minute and widely separated. Galeae shiny above; maxillary palpal segments 6, in ratio of about 1.0:0.9:1.0:0.4:0.4:0.3. Thoracic sculpturing as in female but mesepisternum often with punctures sparser, especially below. Metasomal tergum 1 as in female but apical area shorter; terga 2–4 as similar to female terga 2 and 3 but apical exposed rims typically progressively narrower posteriorly. Sternum 6 (Fig. 116) with apical rim completely covered by fascia or almost so. Pygidial plate and sterna as in cressoniana

Terminalia (Figs. 116–120) similar to those of cressoniana or noguera but hairs somewhat longer and coarser and hair pattern of sternum 6 slightly denser medially, otherwise as figured.

Vestiture.- Vestiture ochraceous except as follows: vertex and thoracic dorsum often ferrugineous; vertex, mesoscutum, and scutellum usually with dark brown hairs, occasionally absent or reduced in number. Metasomal terga 2–5 with vestiture as in cressoniana except tergum 2 with apical fascia often narrowly interrupted medially and terga 2–4 and often 5 with apical pale fasciae not reaching apices of terga, exposing an impunctate, hairless, shiny rim. Sterna as in cressoniana.

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Updated: 2018-10-19 22:41:33 gmt
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