Descriptions of Nests and Eggs of the Green-backed Sparrow and the Grey-throated Chat from the Yucatan Peninsula, Mexico

Phenology, Habitat Use, and Nesting of the Red-Breasted Chat (Granatellus Venustus)

“…Nests of the Red-breasted Chat resemble those described for the insular subspecies, G. V. frcmcescae (Grant 1964), and the Graythroated Chat (Salgado-Ortiz et al 2001 ). Nest dimensions and location are similar, but neither Grant (1964) nor Salgado-Ortiz et al (2001) mentioned material hanging from the cup.…”

“…Nests of the Red-breasted Chat resemble those described for the insular subspecies, G. V. frcmcescae (Grant 1964), and the Graythroated Chat (Salgado-Ortiz et al 2001 ). Nest dimensions and location are similar, but neither Grant (1964) nor Salgado-Ortiz et al (2001) mentioned material hanging from the cup. Salgado-Ortiz et al (2001) reported that only females build the nest and incubate eggs; they also indicated that a complete clutch contains two eggs, whereas most of our nests had four eggs.…”

“…Nest dimensions and location are similar, but neither Grant (1964) nor Salgado-Ortiz et al (2001) mentioned material hanging from the cup. Salgado-Ortiz et al (2001) reported that only females build the nest and incubate eggs; they also indicated that a complete clutch contains two eggs, whereas most of our nests had four eggs. We believe that this difference may not be real, because they found only one nest with a complete clutch.…”

“…Also, the systematic position of the genus is uncertain (Lovette and Bermingham 2002). There is only one description of a nest of the francescae group of G. venustus from the Tres Marias Islands (Grant 1964), and a recent description of two nests of Gray-throated Chats (Salgado-1 Ortiz et al 2001 ). ' I'he Red-breasted Chat is endemic to the 1 tropical deciduous and semi-deciduous forest I of western Mexico from northern Sinaloa I south to Chiapas (American Ornithologists' I Union 1983).…”

The Nest and Eggs of Black-Capped Sparrow Arremon A. Abeillei (Passerellidae) in Southwestern Ecuador

“…So far as is known, members of the genus Atlapetes build open-cup nests and lay white eggs with cinnamon or vinaceous spotting (Rowley, 1962(Rowley, , 1966Salaman et al, 1998;Oppel et al, 2003;de la Peña, 2005;Biancucci & Martin, 2008;Greeney, 2009;Peraza, 2009;Olaciregui & Botero-Delgadillo, 2012;Forrester & Londoño, 2016). Sparrows in the closely related genus Arremonops (del Hoyo et al, 2018), sometimes merged into Arremon (Phelps & Phelps, 1950;Meyer de Schauensee, 1951) lay unmarked eggs like Nest Group 1, but clearly have nest architecture that is nearly indistinguishable from members of Nest Group 2 (Merrill, 1878;Sennett, 1878;Stone, 1918;Skutch, 1954;Rowley, 1984;Salgado-Ortiz et al, 2001). As mentioned above, A. crassirostris and A. castaneiceps, previously separated in the genus Lysurus fall most readily within Nest Group 2, particularly with respect to nest architecture.…”