Acanthylis semicollaris de Saussure, 1859 1859 Revue et Magasin de Zoologie pure et appliquée, 2 e série, vol. 11: 118, pl. 3, fig. “2” (= 6). Now Streptoprocne semicollaris (de Saussure, 1859). See Morony et al., 1975: 51. Syntypes: MHNG 505.048 and MHNG 512.049, unsexed adults, collected in Mexico by H. de Saussure and F. Sumichrast in 1855. The specimen labels indicate the year 1856 (also in Hellmayr, 1942), but the authors’ correspondence proved that their expedition was active in the Mexico City area from May to July 1855 (de Roguin, 1978). Both specimens are from the Sumichrast collection and were acquired by the MHNG in 1859. Comments: The type locality in the original description was “ Les grandes forêts du Mexique ” [The large forests of Mexico]. It was corrected to “ Les plaines du plateau ” [The plains of the plateau] by de Saussure (1861: 3), and finally by Sumichrast (1881: 250) to “ los potreros de San Joaquin, cerca de la capital ” [the pastures of San Joaquin, near the capital]. Because both authors were also the original collectors, their statements should be seen as corrections of the erroneous original description of the type locality, as recommended in the Code (Article 76A.2.A).

Published as part of Cibois, Alice, Vallotton, Laurent, Othman, Nagwa, Weber, Claude & Ruedi, Manuel, 2016, Type specimens of birds in the collections of the Natural History Museum of Geneva, pp. 269-282 in Revue suisse de Zoologie 123 (2) on pages 270-271, DOI: 10.5281/zenodo.155300