Chlerogella rostrata 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 : 27-29

Chlerogella rostrata Engel , sp. n.

urn:lsid:zoobank.org:act:8B314451-279E-4B7F-A803-21D0BA5F050F

Figs 1, 30–32, Map 2

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

Paratypes. PERÚ: 2♀♀, Junin, Quebrada, Mala Noche, c. 10 km West San Ramon, 1300–1500 m, 9–12.vi.1993, M. Cooper ( COOP).

Diagnosis. Chlerogella rostrata belongs to a complex of very similar metallic blue species with elongate malar spaces. It is most similar to C. materdonnae but differs by the more dull, non-shining caerulean blue color of the integument (Figs 30–31; cf. Figs 55–56) and the more densely spaced punctures ventrally on the mesepisternum.

Description. Female: Total body length 9.53–9.65 mm; forewing length 7.0– 7.15 mm. Head length 2.73–2.75 mm, width 1.88–1.91 mm. Clypeus beginning below lower tangent of compound eyes. Malar space 38.5–38.6% compound eye length (malar length 0.60–0.61 mm; compound eye length 1.56–1.58 mm) (Figs 31–32). Upper interorbital distance 0.88–0.89 mm; lower interorbital distance 0.68–0.69 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 1.51–1.52 mm; mesoscutellum weakly convex, not bigibbous. Basal vein distad cu-a by two times vein width; 1rs-m distad 1m-cu by three times vein width; 2rs-m distad 2m-cu by nine 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 about as along as 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 four branches (not including apical portion of rachis).

Clypeus and supraclypeal area imbricate with weak punctures separated by 0.5–1.5 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 0.5–2 times a puncture width; postgena imbricate and impunctate. Pronotum imbricate with minute punctures separated by 1–3 times a puncture width; mesoscutum imbricate with punctures separated by a puncture width or less on lateral thirds and posteriorly, anteromedially punctures becoming exceedingly faint to absent; mesoscutellum finely imbricate with small punctures separated by a puncture

Figures 30–32. Holotype female of Chlerogella rostrata sp. n. 30 Lateral habitus 3Ι Facial aspect 32 Lateral aspect of head.

width or less; metanotum imbricate with minute punctures separated by a puncture width or less. Preëpisternum finely imbricate with small punctures separated by 1–3 times a puncture width; mesepisternum finely imbricate with punctures widely spaced in upper half, separated by 2–5 times a puncture width, blending to noticeably more dense posteriorly and ventrally, separated by 0.5–2 times a puncture width; metepisternum faintly imbricate. Propodeum strongly imbricate. Metasoma finely imbricate.

Mandible dark brown except reddish at apex; labrum dark brown; clypeal apex black, remainder of clypeus and head dark, dull metallic caerulean blue (Fig. 31). Antenna dark brown. Mesosoma dark, dull metallic caerulean blue (Fig. 30); tegula dark brown. Wing membranes lightly infumate; veins dark brown. Legs dark brown. Metasoma dark brown.

Pubescence white except intermingled with dark fuscous setae on metatibia and with dark fuscous setae predominant on tarsi, apicalmost metasomal segments, and pro- and mesotibiae.

Male: Unknown.

Etymology. The specific epithet is taken from the Latin term rostratus, meaning “beaked”.