Abstract: Two specimens of the damselfly (Odonata: Zygoptera) family Coenagrionidae are described from Mexican amber of early Miocene age, identified as Neoerythromma sp. and Nehalennia sp. They constitute the first records of the family Coenagrionidae from this amber, and the first fossil records of the genera Neoerythromma and Nehalennia .

Resumen Dos ejemplares de caballito del diablo (Odonata: Zygoptera) familia Coenagrionidae se describen desde el ámbar mexicano de edad Mioceno temprano, identificado como Neoerythromma sp. y Nehalennia sp. Ellos constituyen los primeros registros de la familia Coenagrionidae de este ámbar, y los primeros registros fósiles de los géneros Neoerythromma y Nehalennia.

Psychodid sand flies are blood-sucking fly vectors of several parasitic diseases. The oldest definitive record of this group is from the Lower Cretaceous amber of Lebanon (circa -135 to -125 My), but the high diversity within this group supports the idea that the psychodoids originated much earlier in history. The palaeontology demonstrates that the Lower Cretaceous representatives of the different subfamilies of Psychodidae had similar morphology and were blood-feeders, which supports Hennig's hypothesis on the ground plan structure of this family. Historical relationship between sand flies and diseases is unclear up to the present time, but this relationship could be as old as the origin of psychodoids because of the blood-feeding life mode.