H. azulum sp. n. is described from a single $ (holotype) collected in Mexico, Veracruz, 2.0 km E Coyame and 12.4 km ENE Catemaco (I8°26'N, 95°0I'W), deposited at FSCA, Gainesville, FL, USA. It differs from all known Central American Heteragrion by the blue-gray coloration of the face and sides of the thorax, the upturned and appressed posterior spines of the paraprocts, and the flattened penis flagellae.