A new record of the mass occurrence of Aeshna (Hesperaeschna) confusa (Rambur) on a ship in the mouth of the Rio de la Plata, Uruguary (Anisoptera: Aeshnidae)

Dr. K. Jazdzewski of the First Polish Antarctic Marine Research Expedition, on January 20, 1976, took three males (one not fully mature) pertaining to this species. The text on the label reads: "Uruguay, La Plata, Montevideo, in front of the port gate; mass flight over the ship ’Profesor Siedlecki’, in the morning”. The specimens are in Dr. B. Kiauta’s collection, Utrecht. A. (H.) confusa has been recorded at least twice earlier on ships off the mouth of the Rio de La Plata. F. R1S (1904, Hamb. Magalh. Sammelreise 2: 29) around the New Year of 1890/1891 observed many hundreds of individuals of this species and of A. (Neureclipa) bonariensis (Ramb.) on the steamer ’’Darmstadt”, many miles from land. H. SCOTT (1934, Ent. mon. Mag. 67: 279) reported that a number of specimens of both sexes came on board of H.M.S. ’’Eagle”, on February 23, 1931, when the ship was about 60 miles from land off the Rio de La Plata.