Chlerogella arhyncha Engel, 2010

Engel, Michael, 2010, Revision of the Bee Genus Chlerogella (Hymenoptera, Halictidae), Part II: South American Species and Generic Diagnosis, ZooKeys 47 (47), pp. 1-100 : 18-22

Chlerogella arhyncha Engel , sp. n.

urn:lsid:zoobank.org:act:3D292109-C246-4220-B1AF-4880595E1DC6

Figs 18–23, 39–41, Map 2

Holotype. ♀, PERÚ: Junin, Quebrada Mala Noche , c. 10 km W. San Ramon, 1300– 1500m, 9–12 vi.1993 [9–12 June 1993], M. Cooper ( COOP).

Paratypes. PERÚ: 1♁, Junin, Quebrada Mala Noche , c. 10 km W. San Ramon, 1300–1500m, 16.vii.1990 [16 July 1990], M. Cooper ( COOP) ; 2♁♁, Junin, Que-

Figures Ι8–20. Holotype female of Chlerogella arhyncha sp. n. Ι8 Lateral habitus Ι9 Facial aspect 20 Lateral aspect of head and anterior mesosoma.

brada Mala Noche, c. 10 km W. San Ramon, 1300–1500m, 9–12 vi.1993 [9–12 June 1993], M. Cooper ( COOP).

Diagnosis. Chlerogella arhyncha , as its name suggests, is distinctive for the near absence of a discernible malar space, the compound eye abutting the mandibular base (Figs 19–20, 22–23).

Figures 2Ι–23. Male of Chlerogella arhyncha sp. n. 2Ι Lateral habitus 22 Facial aspect 23 Lateral aspect of head.

Description. Female: Total body length 7.50 mm; forewing length 5.73 mm. Head length 1.90 mm, width 1.67 mm. Clypeus beginning above lower tangent of compound eyes (Fig. 19). Malar space 1.9% compound eye length (malar length 0.026 mm; compound eye length 1.38 mm) (Figs 19–20). Upper interorbital distance 0.89 mm; lower interorbital distance 0.73 mm. Upper portion of pronotum medially depressed, not elongate, medially less than 0.25 times ocellar diameter in length; ventral portion of preëpisternal sulcus not broad, similar to scrobal sulcus and upper portion of preëpisternal

Map 2. Collection localities for Peruvian Chlerogella (note that C. azurea extends into southeastern Ecuador; vide etiam Map 3).

sulcus; intertegular distance 1.22 mm; mesoscutellum weakly convex, not bigibbous. Basal vein distad cu-a by two times vein width; 1rs-m distad 1m-cu by two times vein width; 2rs-m distad 2m-cu by five times vein width, 2rs-m relatively straight; first submarginal cell longer than combined lengths of second and third submarginal cells; second submarginal cell slightly narrowed anteriorly, anterior border of second submarginal cell along Rs slightly shorter than that of third submarginal cell; posterior border of third submarginal cell slightly more than two times longer than anterior border. Distal hamuli arranged 2-1-2. Inner metatibial spur with five branches (not including apical portion of rachis).

Clypeus and supraclypeal area imbricate with weak punctures separated by 0.5–2 times a puncture width; face with small, contiguous punctures, more widely spaced in malar space; punctures of face blending to imbricate integument in ocellocular area and vertex, with punctures separated by a puncture width or less; gena finely imbricate with small punctures separated by 1–2 times a puncture width; postgena imbricate and impunctate. Pronotum imbricate with minute punctures separated by 1–2 times a puncture width; mesoscutum strongly imbricate with small punctures separated by 1–1.5 times a puncture width on lateral thirds and posteriorly, anteromedially punctures becoming exceedingly faint to absent; mesoscutellum and metanotum imbricate with minute scattered punctures. Preëpisternum imbricate, weakly rugulose above; mesepisternum imbricate with small punctures separated by 2–4 times a puncture width, punctures weak; metepisternum faintly imbricate. Propodeum strongly imbricate. Metasoma finely imbricate.

Mandible dark brown except reddish at apex; labrum dark brown; clypeal apex dark brown, remainder of clypeus and head dark metallic bluish green to greenish grey-blue. Antenna dark brown except ventral surface of scape lighter. Mesosoma dark metallic bluish green to greenish grey-blue (Fig. 18); tegula dark brown. Wing membranes lightly infumate; veins dark brown. Legs dark brown. Metasoma dark brown, with apical margins of TIII–VI translucent brown.

Pubescence white to slightly golden except dark fuscous on tibiae, tarsi, and apically on metasoma.

Male: As described for the female except as follows: Total body length 7.20–7.25 mm; forewing length 5.33–5.40 mm. Head length 1.67–1.70 mm, width 1.51–1.53 mm. Malar space 2.1% compound eye length (malar length 0.026 mm; compound eye length 1.22–1.23 mm) (Figs 22–23). Upper interorbital distance 0.78–0.79 mm; lower interorbital distance 0.52–0.54 mm. First flagellomere about as long as pedicel, about as long as wide; second flagellomere two times length of first flagellomere; ventral surfaces of second through eleventh flagellomeres densely covered in placoid sensilla, placoid fields not disrupted. Intertegular distance 1.07–1.10 mm. Inner metatibial spur minutely ciliate. Apical margin of SIII entire; apical margin of SIV entire, without furrow on disc; apical margin of SV entire; apical margin of SVI emarginate; terminalia as depicted in figures 39 and 41.

Mandible, labrum, and clypeal apex pale yellow, remainder of head dark metallic blue with greenish cast in various places. Antenna brown except ventral surface of scape lighter. Mesosoma reddish brown (faded) with dark metallic blue or greenish blue dorsally and in places on pleura (specimen is clearly very faded) (Fig. 21). Legs brown except tibiae and tarsi lighter. Metasoma dark reddish brown with strong metallic blue highlights on terga.

Pubescence white, with typical gender pilosity. Apical margin of SIII without fringe; SIV with diffuse apicolateral areas of long, white setae; SV laterally with diffuse areas of long, inwardly-curved setae.

Etymology. The specific epithet is a combination of the Greek prefix a (meaning, “without”) and the term rhynchos (meaning, “snout”).