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.