Calochromini, Lacordaire, 1857

Motyka, Michal & Bocak, Ladislav, 2018, Escalonius, a new subgenus of Calochromus Guérin-Méneville, 1833 identified by the molecular phylogeny of Calochromini (Coleoptera: Lycidae), Zootaxa 4461 (1), pp. 77-82 : 81

Key to World Calochromini genera and subgenera

1. Male genitalia with sclerotized internal sac................................................................ 2

- Male genitalia with membranous internal sac................................................................ 3

2. Antennomere 3 no more than twice as long as pedicel, antennae slender, never flabellate or serrate............... Parantis

- Antennomere 3 three or more times longer than pedicel, antennae mostly serrate, seldom slender............ Micronychus

3. Head with long rostrum, i.e., distance between frontal margin of clypeus and frontal edge of antennal cavities is at least three times longer than width of labrum; apical part of parameres divergent, distributed in New World..................... 4

- Head without rostrum or only short rostrum present, i.e., distance between frontal margin of clypeus and frontal edge of antennal cavities is less than twice longer than width of labrum; distributed in Palearctic, Oriental, Australian, Nearctic regions.. 5

4. Long erect setae on pronotum and elytra, egg-shaped elytra, distributed in the southern part of the Nearctic region.. Lucaina

- Pronotum and elytra without long setae, often brightly or metallically coloured, elytra parallel-sided to widened apically, most species distributed in the Neotropical region , several species in Mexico............................ Macrolygistopterus

5. Pronotum with sharp lateral edges, apical part of parameres lateral process of phallobase acute.............. Lygistopterus

- Pronotum with obtuse lateral edges, apical part of parameres lateral process of phallobase widely rounded ( Calochromus ). 6

6. Male antennae flabellate, pronotum and elytra dark red or black without metallic shine, covered with dense pubescence......................................................................................... sg. Flabellochromus

- Male antennae filiform to serrate......................................................................... 7

7. Lateral pronotal margins concave, phallus much longer than parameres....................... Escalonius subgen. nov.

- Lateral pronotal margins convex, phallus similar in length or shorter than parameres................................ 8

8. Pronotum bare, without pubescence, numerous species with pronotum and elytra yellow or blue coloured with metallic shine...................................................................................sg. Calochromus s. str.

- Pronotum covered with dense pubescence, all species with dark red or black pronotum and elytra, without metallic shine........................................................................................ sg. Paracalochromus