Ceratina (Calloceratina), Cockerell, 1924

Subgenus Calloceratina Cockerell, 1924

Diagnosis (Adapted from MICHENER 2007). Body length between 5.7 and 13.5. Integument coloration varying from black to strongly brilliantly metallic green or blue, some species with the metasoma copper, gold or metallic dark purple. Yellow marks restricted to labrum, clypeus and legs, normally at least with a pale-yellow stripe on the apical margin of outer surface of metatrochanter; rarely yellowish marks in pronotal lobes, tegulae and on costal sclerite in forewings. Genal area always without yellow or pale marks; some males with yellow marks on the mandible and above the lateral margins of clypeus. Females with scopa on metafemur and metatibia. Genal area and disc of mesoscutum with extensive smooth and polished areas, normally slightly denser on males. Maxillary palpus five or six segmented. Three mandibular teeth in females, being the median tooth the largest, followed by the inferior; males with two mandibular teeth, the superior largest. Ocelli delimited posteriorly by a conspicuous furrow. Preoccipital carina present, varying from weakly to well developed, normally more conspicuous in males.Pronotum with distinct transverse carina, sometimes interrupted medially, in front of posterior margin of pronotum, curving strongly downwards on each side of procoxa, rarely absent on lateral areas. Procoxa never strongly expanded laterally. Protibia and mesotibia with two dorsoapical spiniform projections. Basitibial plate of female and some males usually represented by conspicuous oblique carina, sometimes reduced or vestigial. Marginal cells at least two times as long as the distance from its apex to wing tip. Tergal graduli present on T2 to T4 or T5. Wax plates on S2 and S3. Ceratina (Calloceratina) shares the strong pronotal carina with C. ( Crewella ) and C. ( Neoclavicera ), but their species can be distinguished by de tibial carina in females, and the absence of pale marks on lower paraocular area and gena.

KEY TO THE SOUTH AMERICAN SPECIES OF CERATINA (CALLOCERATINA) View in CoL

1. Body sparsely punctated leaving large, polished spaces between punctures, especially on frons and vertex (distance between punctures approximately equal to or wider than 1 DO) ( Figs 5C View Figure 5 , 7C View Figure 7 ); ( silveirai species-group) ........................... 2

-. Body densely punctated, polished areas only on gena and disc of mesoscutum............................................................... 3

2. Metapostnotum finely reticulate, almost polished and with a weak median carina ( Figure 5D View Figure 5 ); lower interocular distance much larger than upper, inner orbits of compound eyes diverging below giving the head a square aspect ( Figure 5C View Figure 5 ) ............................. C. (Calloceratina) silveirai n. sp.

-. Metapostnotum finely reticulate ( Figure 7D View Figure 7 ); inner orbits of compound eyes subparallel ( Figure 7C View Figure 7 ) .................................. ................................................. C. (Calloceratina) mourei n. sp.

3. Clypeus with a maculation ranging from a narrowed horizontal stripe to a large rounded or triangular spot; graduli present on T 2 to T 4; S 5 of male with two short acute processes separated from each other by approximately 5-8x their own length ( Figure 2C View Figure 2 ) ............................................. ......................................... C. (Calloceratina) chloris (Fabricius)

-. Clypeus with a large yellow triangular maculation expanded towards its lateral expansions; graduli present on T 2 to T 5; S 5 of male without acute processes ( Figure 4C View Figure 4 )..................... ................................... C. (Calloceratina) triangulifera Cockerell