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Tetraloniella imitatrix (Cockerell and Porter, 1899)
Xenoglossodes imitatrix Cockerell and Porter, 1899

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):67162.

Tetraloniella imitatrix is a medium-sized bee, the female of which has metasomal terga 36 covered by pale pubescence (as in eriocarpi and wilmattae) but lacks the pale markings on the mandibular bases, labrum, and clypeus. Both sexes have a large pterostigma as described below and the antennae are of moderate length and dark brownish red to black beneath. The female scopal hairs are highly plumose but the branches are short and the general appearance is of less plumosity. The male has white or cream-colored clypeus, labrum, and mandibular bases; dark antennae with a long first flagellar segment and sternum 6 without lateral teeth.

FEMALE. Measurements and Ratios.- N = 20; length, 912 mm; width, 3.55.0 mm; wing length, M = 3.160.253 mm; hooks in hamulus, M = 12.150.167; flagellar segment 1/2, M = 1.850.027.

Integumental Color.- Integument piceous except as follows: mandible with apical half dark red smeared with gold; flagellum below dark reddish brown near tip, mostly black; tegulae hyaline, red to yellow; wing membranes hyaline, colorless, veins dark reddish brown to black; terga 15 with apical areas with at least apical half of each hyaline,colorless to slightly yellow; sterna with narrow apical areas hyaline, colorless; disitarsi dark red to reddish brown; tibial spurs ochraceous.

Structure.- Clypeus as in eriocarpi but surface often moderately shagreened at least posteriorly. Supraclypeal area with punctures smaller, often sparser, surface usually shagreened. Face above antennal fossae as in eriocarpi. Vertex laterally as in eriocarpi but minute punctures often separated by one to two puncture widths, surface shiny or slightly dulled by fine shagreening. Genal area and galea as in eriocarpi. Maxillary palpal segments usually 5, occasionally with a short sixth segment, ratio of about 1.0:0.9:0.8:0.3:0.2 or with a 0.1 to 0.2 sixth segment added. Flagellar segment 2 almost always distinctly longer than maximum width, rarely about as wide as long, all segments longer than broad. Mesoscutum sculptured as in eriocarpi but posteromedian punctures usually slightly more crowded; scutellum similar but punctures smaller and usually more crowded. Propodeum as in eriocarpi. Mesepisterna with punctures usually crowded, small, shallow, surface dulled by fine shagreening; a few specimens from New Mexico with punctures deeper and shagreening present but finer. Forewing with pterostigma large, usually distinctly longer than prestigma. Terga 24 sculptured as in eriocarpi, tergum 1 usually with apical area with basal half or slightly less punctate. Pygidial plate and sterna as in eriocarpi.

Vestiture.- Generally pale ochraceous to ochraceous, dorsum of thorax and vertex slightly darker. Metasomal tergum 2 with pale basal pubescent band usually separated from apical pale band by a zone of relatively simple, erect to suberect, short hairs not hiding surface of integument (reduced to about half width of tergum in two specimens); terga 36 completely covered by highly plumose pale pubescence. Sternal hairs red to white or pale ochraceous. Scopal hairs highly plumose, branches of hairs short, white to extremely pale ochraceous, inner surfaces tarsi red to orange.

MALE. Measurements and Ratios.- N = 17; length, 811 mm; width, 2.53.5 mm; wing length, M = 2.950.248 mm; hooks in hamulus, M = 11.180.176; flagellar segment 2/1, M = 3.460.57.Integumental Color.- Integument black except as follows: clypeus, base of mandible, and labrum entirely pale cream-colored to white, not yellow; supraclypeal area occasionally with small white macula; flagella dark brownish red to black below, dark above; tegula hyaline, yellow; tarsi brownish red to red; tibiae dark brown; terga with apical areas hyaline, colorless to slightly yellow.

Structure.- Head sculptured much as in female but clypeus and supraclypeal area usually not shagreened; maxillary palpus with five segments in ratio of about l.0:0.8:0.8:0.5:0.3; antennae of moderate length, barely reaching metasomal tergum 1, second flagellar segment equals three to four times length of first segment, segments round in cross-section, not at all crenulate. Mesoscutum with posteromedian area with deep punctures separated mostly by half to one puncture width, peripherally and anterior third or so with punctures slightly smaller and separated mostly by half a puncture width or less, surface shiny; scutellum similar but punctures small. Mesepisternum with punctures small, shallow (but not as shallow as in most females), surface moderately dulled by fine shagreening. Propodeum much as in female. Pterostigma large as in female. Metasomal terga with discs and basal area punctures small, crowded, surfaces moderately dulled by fine shagreening; apical areas similar but punctures only in basal half. Tergum 7 with lateral arm of postgradulus carinate, without tooth. Pygidial plate about one and onehalf times as broad at base as median length, usually with weak subapical lateral notches. Sternum 6 (Fig. 156) relatively flat, without lateral teeth, with oblique carinae on each side following apical margin and turned anteriorly near base (a little more than half their length).

Terminalia (Figs 156160) similar to jaliscoensis (Figs. 121125) but sternum 7 (Fig. 157) with apicomedian plates pointed apically, with sparse hairs and sternum 8 (Fig. 158) with moderately abundant, short hairs on apical margin. Gonostylus and genital capsule as drawn (Figs. 159 and 160).

Vestiture.- White to pale ochraceous, slightly darker on thoracic dorsum and vertex; tergum 1 usually with apical pale pubescent fascia complete, although weak medially; tergum 2 usually with basal and apical pale bands separated by disc with short, suberect, relatively simple hairs not hiding surface, but occasionally with plumose pubescence virtually over entire tergum; terga 36 covered with pale plumose pubescence, but apical fasciae often recognizable by longer hairs; sterna with relatively sparser, suberect long hairs, more plumose and much longer laterally; sternum 6 with little or no vestiture.

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Updated: 2018-10-21 15:07:23 gmt
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