Chlerogella borysthenis 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 : 48-49

Chlerogella borysthenis Engel , sp. n.

urn:lsid:zoobank.org:act:C194957D-DE52-4D40-966F-2C983805DA81

Figs 74–76, Map 3

Holotype. ♀, ECUADOR: Pichincha, Mindo , 1300 m, 7.vi.1987 [7 June 1987], M. Cooper ( COOP).

Diagnosis. Chlerogella borysthenis from the northwestern side of the Ecuadorian Andes is superficially similar to C. breviceps , the latter from the eastern side of the Andes in Ecuador, but differs in the length of the malar space (Figs 75–76) and the dark and dull metallic greyish blue-green to greenish blue coloration of the head and mesosoma (Figs 74–76).

Description. Female: Total body length 8.22 mm; forewing length 5.80 mm. Head length 2.16 mm, width 1.93 mm. Clypeus beginning above lower tangent of compound eyes. Malar space 6.75% compound eye length (malar length 0.104 mm; compound eye length 1.54 mm) (Figs 75–76). Upper interorbital distance 0.91 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 sulcus; intertegular distance 1.30 mm; mesoscutellum weakly convex, not bigibbous. Basal vein distad cu-a by three times vein width; 1rs-m distad 1m-cu by two times vein width; 2rs-m distad 2m-cu by ten times vein width, 2rs-m gently arched; 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 1.75 times longer than anterior border. Distal hamuli arranged 2-1-2. Inner metatibial spur with four 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, nearly contiguous punctures, more widely spaced in malar space; punctures of face blending to faintly imbricate integument in ocellocular area and vertex, with punctures separated by a puncture width or less; gena faintly imbricate with small punctures separated by 1–2 times a puncture width; postgena imbricate and impunctate. Pronotum imbricate with minute punctures separated by 1–3 times a puncture width; mesoscutum finely imbricate with small punctures separated by a puncture width or less, anteromedially punctures becoming faint; mesoscutellum faintly imbricate with small punctures separated by a puncture width or less; metanotum imbricate with minute punctures separated by a puncture width or less. Preëpisternum faintly imbricate with small punctures separated by 0.5–2 times a puncture width; mesepisternum faintly imbricate with small punctures separated by 0.5–1.5 times a puncture width; metepisternum faintly imbricate. Propodeum strongly imbricate. Metasoma weakly imbricate.

Mandible dark brown except reddish at apex; labrum dark brown; clypeal apex dark brown, remainder of clypeus and head dark greyish blue-green to greenish blue. Antenna dark brown. Mesosoma dark greyish blue-green to greenish blue (Fig. 74);

Figures 74–76. Holotype female of Chlerogella borysthenis , sp. n. 74 Lateral habitus 75 Lateral aspect of head 76 Facial aspect.

tegula brown. Wing membranes infumate; veins dark brown. Legs dark brown. Metasoma dark brown, with metallic highlights.

Pubescence white except fuscous on legs and apical metasomal segments.

Male: Unknown.

Etymology. The specific epithet is the name of one of the three Greek muses who were daughters of Apollo (Cephisso, Apollonis, and Borysthenis).