Calochromini

Ferreira, Vinicius S., 2016, A revision of the genus Macrolygistopterus Pic, 1929 (Coleoptera, Lycidae, Calochromini), Zootaxa 4105 (4), pp. 321-338 : 323

Key to the world Calochromini (modified from Green, 1954)

1. Head prolonged in rostrum, antenniferous tubercles not developed, mandibles distant when closed never overlapping...... 2

- Head not prolonged in rostrum, antenniferous strongly developed, mandibles when closed overlapping or approximated.... 4

2. Elytral costae well developed and strongly demarcated, some of which partially obliterated, apex of elytra with traces of reticulated cells, specimens medium to big size.......................... Macrolygistopterus Pic, 1929 (Neotropical region)

- Elytral costae not developed, not obliterated, without traces of reticulate cells at apex, specimens small to medium size..... 3

3. Labrum completely free, distinctly visible, mandibles curved, more or less connate to labrum, secondary elytral costae absent, dorsal pubescence decumbent, anterior coxae approximated, rostrum of variable shape....................................................... .. Lygistopterus Mulsant, 1838 (Neotropical, Afrotropical, Neartic, Paleartic and Oriental regions)

- Labrum suture sometimes indistinct, apparently fused with rostrum, mandibles straight or curved, secondary elytral costae weakly developed, dorsal pubescence long and erected, anterior coxae not approximated, rostrum elongated and stout.............................................................. Lucaina Dugés, 1879 (Nearctic and Neotropical regions)

4. Elytral pubescence sparse, mostly confined to the elytral costae, invervals subglabrous. Anterior coxae distinctly separated................................................................... Caloptognatha Green, 1954 (Nearctic region)

- Elytra uniformly pubescent. Anterior coxae contiguous or very approximated...................................... 5

5. Elytra with reticulate cells at apex, with 4 primary elytral costae well defined and 5 secondary costae weakly developed, antennae serrate....................................................... Adoceta Bourgeois, 1882 (Afrotropical region)

- Elytra without reticulated cells at apex, with 4 primary elytral costae well defined and secondary usually absent, antennae serrate or flabellate............ Calochromus Guérin-Méneville, 1833 (Nearctic, Afrotropical, Oriental and Australian regions)