Key to the Neotropical species of Ceratina (Zadontomerus)

Females

1. Pronotal lobe with yellow mark......................................................................... 2

- Pronotal lobe without yellow mark, same color as the rest of mesosoma.......................................... 5

2. Anterior tibia with a longitudinal yellow mark, scutum disc almost entirely impunctate (Fig x). C. nautlana Cockerell, 1897

- Anterior tibia with yellow spot at the base, scutum disc with punctures along the medial line.......................... 3

3. Preoccipital carina well pronounced, foveate and forming a strong depression; total length no greater than 6 mm .................................................................................................. C. kopili sp. n.

- Preoccipital carina foveate, not forming a strong depression; total length from 6.5–9 mm ............................ 4

4. Gena impunctate, polished area adjacent to eye broad, 1/3 genal width; disc of scutum with sparse, fine punctures along the median line, separated by a distance up to 5 times a puncture diameter; wings subhyaline.............. C. basaltica sp. n.

- Gena impunctate, polished area adjacent to eye narrow, gena punctures covering almost all surface; disc of scutum with coarse punctures dispersed along median line, separated by a distance up to 3 times a puncture diameter (Fig. 21C); wings moderately dark brownish.......................................................................... C. rehanae sp. n.

5. Clypeus yellow mark small and narrow (length 3 times middle width) or absent................................... 6

- Clypeus with oval and wide yellow mark (length up to 2.5 times middle width).................................... 7

6. Propodeal triangle striate throughout, with conspicuous lateral striae; body green olivaceous with metallic tints; clypeus with narrow yellow mark, T4 posterior margin with thick and long hairs (Fig 15E)...................... C. raquelitae sp. n.

- Propodeal triangle polished with single medial stria; body dark metallic blue, sometimes dark green; clypeus with or without reduced yellow mark; T4 posterior margin with thin hairs, scarce thick hairs........................ C. sapphira sp. n.

7. Stigma yellowish or light brown; posterior margin of T4, T5 and T6 with dense yellowish pubescence; olive green propodeum contrasting with black scutum and scutellum........................................... C. capitosa Smith, 1879

- Stigma brown to dark brown; posterior margin of T4, T5 and T6 with dispersed pubescence; mesosoma entirely green olivaceous or blue............................................................................................ 8

8. Head and mesosoma metallic blue, metasoma green or copper with metallic tints; vertex with short and sparse pubescence.. ................................................................................................... 9

- Head, mesosoma and metasoma green olivaceous with metallic tints; vertex with long, yellowish and scattered pubescence....................................................................................... C. tepetlana sp. n.

9. Metasoma length about twice or more the width; total length from 7.0 to 9.0 mm............... C. ignara Cresson, 1878

- Metasoma short, length less than twice the width; total length from 5.5 to 7.0 mm................. C. indigovirens sp. n.

Males

1. Pronotal lobe with yellow mark......................................................................... 2

- Pronotal lobe without a yellow mark, same color as the rest of mesosoma........................................ 5

2. T7 with two laminar projections forming a middle notch, slightly evident in some specimens (Fig. 22 C-D); anterior tibia with longitudinal yellow mark......................................................... C. nautlana Cockerell, 1897

- T7 with posterior margin concave, forming a medial narrowly rounded projection (Fig. 22E, F, J); anterior tibia with a yellow spot at the base....................................................................................... 3

3. Preoccipital carina well pronounced, foveate and beginning in the upper third of occiput, forming strong depression (Fig 7E); hind femur with strong ventral dilation forming an angle as in Figure 21D; total length from 4.0– 5.5 mm .... C. kopili sp. n.

- Preoccipital carina foveate not forming strong depression; hind femur with strong ventral dilation forming an angle as in Figures 21E, 21I; total length from 6.0–8.0 mm............................................................. 4

4. T6 with swollen area strongly evident under a yellowish tuft of pubescence; wings subhyaline; hind trochanter ventrally rounded; hind femur with ventral dilation forming an angle as in the figure 21E..................... C. basaltica sp. n.

- T6 surface without swollen area, middle area with a yellowish tuft of pubescence; wings brownish, marginal cell darker than the rest of the forewing; hind trochanter ventral surface forming a right angle; hind femur with ventral dilation forming an angle (Fig. 21I).............................................................................. C. rehanae sp. n.

5. Lower paraocular area with yellow marks; T7 with concave lateral margins, distal margin truncate (Fig. 22B).......................................................................................... … C. ignara Cresson, 1878

- Lower paraocular area without yellow marks; T7 with two posterior projections forming middle notch or with concave lateral margins forming a medial projection …................................................................... 6

6. T7 with two posterior projections forming middle notch ….................................................... 7

- T7 with concave lateral margins forming medial projection..................................................… 8

7. Head and mesosoma metallic blue, metasoma metallic green; hind femur with strong rounded ventral dilation (Fig. 21J); outer margin of gonocoxite rounded (Fig. 20) …................................................ C. indigovirens sp. n.

- Body entirely dark metallic green; hind femur with ventral slight dilation round shaped (Fig. 21H); outer margin of gonocoxite apex forming an acute angle (Fig. 16) ….................................................... C. raquelitae sp. n.

8. Clypeus with transversal yellow mark in the lower area; propodeal triangle polished, with a middle stria; body entirely metallic dark blue (dark green in some cases) …...................................................... C. sapphira sp. n.

- Clypeus with T-shaped yellow mark; propodeal triangle striate; body entirely olivaceous green or head and metasoma black and mesosoma olivaceous green ….......................................................................... 9

9. Stigma light brown; hind trochanter and femur with scarce pubescence (Fig. 21A); head and mesosoma except propodeum black with metallic tints, propodeum and metasoma olivaceous green (…)...................... C. capitosa Smith, 1879

- Stigma dark brown; hind trochanter with dense long pubescence; hind femur basal half with disperse long pubescence (Fig. 21F); body entirely olivaceous green (…).................................................... C. tepetlana sp. n.