A synopsis of the Patagonian species of the genus Aeshna Fabricius (Anisoptera: Aeshnidae)

This synopsis includes diagnoses for adults, a key for S cf and $ 5, illustrations of taxonomic characters and updated distribution data for each sp. The ventral terga contour is found to vary interspecifically allowing identification of all species. Other useful characters are the presence or absence of black stripes over frontoclypeal and fronto-ocular grooves, abdominal colour pattern and shape of the cerci. Some colour characters of A. variegata vary geographically and two forms are described: a dark (humid biomes) and light form (dry biomes). The synonymy of A. peralta and A. variegata is considered doubtful.