Revision of the bee genus Chlerogella (Hymenoptera, Halictidae), Part I: Central American species Author Engel, Michael University of Kansas, Natural History Museum, Lawrence, United States of America text ZooKeys 2009 2009-10-06 23 23 47 75 journal article 22678 10.3897/zookeys.23.248 c5b81cd2-0466-48f5-b9e5-964001e74cfb 1313–2970 576547 B8BF67EF-769B-482A-8EEB-77722F80EB94 Key to Central American species of Chlerogella Males remain unknown for C . clidemiae and females for C . fortunaensis , C . anthonoma , and C . pinocchio . 1. Females...................................................................................................... 2 – Males......................................................................................................... 5 2(1). Metasoma with at least TI–II amber-yellow (Figs 1, 7, 27); ventral portion of preëpisternal sulcus as wide as scrobal sulcus and upper portion of preëpisternal sulcus ................................................................................................... 3 – Metasoma with all terga dark brown (Fig. 10); ventral portion of preëpisternal sulcus distinctly broad dorsally at junction of scrobal sulcus and upper portion of preëpisternal sulcus ( Panamá )........................... C . prolixa , sp. n. 3(2). Pleura and legs amber-yellow (Figs 1, 7); clypeus largely light reddish brown or extensively marked with amber-yellow (Figs 3, 9) .................................. 4 – Pleura and legs largely brown with strong metallic copper highlights (Fig. 27); clypeus dark brown with strong metallic copper highlights, exceedingly narrow transverse band of lighter integument at extreme apex (Fig. 29) ( Costa Rica ) ............................................................................. C . kellieae , sp. n. 4(3). Malar space 25% of compound eye length, length about twice basal mandibular width (Figs 2, 3); clypeus at lower tangent of compound eyes; mesoscutum dark brown with strong metallic green-copper highlights; inner metatibial spur with three branches, excluding apical portion of rachis; mesoscutum with punctures separated by a puncture width or frequently less; upper pronotal surface expanded, about two ocellar diameters in medial length ( Panamá ) ............................................................. C . elongaticeps Michener – Malar space 68% of compound eye length, length more than five times basal mandibular width (Figs 8, 9); clypeus below lower tangent of compound eyes; mesoscutum light reddish brown with faint copper highlights; inner metatibial spur with five branches, excluding apical portion of rachis; mesoscutum with punctures separated by 1–2 times a puncture width; pronotal postero-dorsal surface not expanded, at most a single ocellar diameter in medial length ( Panamá ) ...................................................... C . clidemiae Engel 5(1). Metasoma entirely dark brown, without amber coloration (Figs 13, 17, 33) ..... 6 – Metasoma marked with amber-yellow or entirely amber (Figs 4, 24, 30).... 8 6(5). Metasomal SIV unmodified, apical margin straight, medial furrow and setal pads absent; integument of head and mesosoma dark metallic blue or green ............. 7 – Metasomal SIV medioapically produced and emarginate, with medial longitudinal furrow bordered by inward-directed setal pads (Fig. 16); integument of head (Fig. 14) and mesosoma blue-black ( Panamá )....... C . prolixa , sp. n. 7(6). Integument of head and mesosoma metallic green (Figs 33, 34); scape and pedicel entirely yellow; clypeal apex pale yellow (Fig. 34); legs brown to dark brown (except protibia and tarsi, excluding large portion of metabasitarsus, yellow) with light brown to yellowish brown areas around podite articulations ( Costa Rica ) .......................................................... C . pinocchio , sp. n. – Integument of head and mesosoma dark metallic blue with purple highlights (Figs 17, 18); scape and pedicel brown except extreme proximal end of scape a little yellow; clypeal apex brown (Fig. 18); legs entirely brown to dark brown ( Panamá ) .................................................................. C . fortunaensis , sp. n. 8(5). Malar space more than 50% of compound eye length (Figs 25, 26, 31, 32) ...... 9 – Malar space less than 25% of compound eye length (Figs 5, 6) ( Panamá ) .... ............................................................................ C . elongaticeps Michener 9(8). Metasoma entirely amber (Fig. 30); pleura largely amber; setae on inner surface of metabasitarsus golden; second submarginal cell very narrow, anterior border along Rs less than one-third length of anterior border of third submarginal cell along Rs ( Costa Rica ).................................. C . anthonoma , sp. n. – Metasomal terga largely brown, marked with yellow on TI and laterally-basally on terga, sterna almost entirely yellow (Fig. 24); pleura metallic coppergreen; setae on inner surface of metabasitarsus dark fuscous; second submarginal cell normally rectangular, anterior border along Rs approximately equal in length to anterior border of third submarginal cell along Rs ( Costa Rica ) ......................................................................................... C . kellieae , sp. n.