Browsing by Author "Eisenmann, Eugene, 1906-"
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Item A new species of swift of the genus Cypseloides from Colombia. American Museum novitates ; no. 2117(New York, N.Y. : American Museum of Natural History, 1962) Eisenmann, Eugene, 1906-; Lehmann V., F. Carlos."A new species of swift, Cypseloides lemosi, is described from the foothills of southwestern Colombia, department of Cauca, characterized by a conspicuous white pectoral patch and forked tail, without stiffened rectrices. 2. Additional information is provided as to the characters and distribution of Cypseloides cryptus Zimmer, with first published records from Colombia and Honduras. 3. Generic relationships between Cypseloides and its allies are discussed"--P. 15.Item Notes on nighthawks of the genus Chordeiles in southern Middle America, with a description of a new race of Chordeiles minor breeding in Panamá. American Museum novitates ; no. 2094(New York, N.Y. : American Museum of Natural History, 1962) Eisenmann, Eugene, 1906-"A new subspecies of common nighthawk, Chordeiles minor panamensis, is described, which breeds in Panamá and probably in Costa Rica. 2. The supposedly lost type of C. virginianus aserriensis Cherrie is in the American Museum of Natural History. Oberholser's application of this name to the breeding population of south Texas is supported. 3. Reasons are advanced for treating the West Indian Nighthawk, C. gundlachii (including vicinus), as a species distinct from C. minor. 4. The distribution and variation of C. minor and C. acutipennis in Middle America are discussed. Both species probably breed in suitable habitats throughout Central America. 5. Specimens of C. acutipennis taken during the breeding season, or immediately thereafter, in Nicaragua, Costa Rica, and Panamá resemble the South American C. a. acutipennis much more than any Mexican population. 6. Color parallelism in the two species and possible adaptation to soil color and climate are discussed"--P. 19.Item Systematics of the avian genus Emberizoides (Emberizidae). American Museum novitates ; no. 2740(New York, N.Y. : American Museum of Natural History, 1982) Eisenmann, Eugene, 1906-; Short, Lester L.; Partridge, William, ornithologist."The genus Emberizoides has long been maintained as monotypic, but with one polytypic species, E. herbicola. The late Argentine ornithologist William Partridge discriminated between large and small forms found together in Argentina, but his illness and untimely death prevented him from writing up the results of his observations. We studied Partrdige's specimens and others available from various museums and found that the 'small' and 'large' forms are broadly sympatric in eastern Paraguay, southern Brazil, and northeastern Argentina; they differ in various measurements, in dorsal and ventral markings and pattern, in color of the face, bill shape, and size of the legs and toes. The available name for the small form, a sibling species of large Emberizoides herbicola, is E. ypiranganus von Ihering and von Ihering, named by them as a subspecies of E. herbicola. Vocal and ecological data are limited but indicate that these species of Emberizoides have markedly different songs, that at least E. herbicola does not react to the song of E. ypiranganus, and that ypiranganus favors wetter marsh grass habitats than does herbicola. Extensions of these results with morphological studies of the other taxa included in Emberizoides strongly suggest that the Duida Mountain, Venezuela, form E. (herbicola) duidae, differs at least as much from races of E. herbicola as does E. ypiranganus, and especially from the subspecies E. herbicola sphenurus of the lowlands surrounding Duida Mountain. Northern races (the sphenurus group) of E. herbicola are divergent otherwise from the nominate southern race, but not to the extent of E. duidae and and E. ypiranganus. The song of the most divergent race, apurensis, of the sphenurus group, is recognizably like that of E. h. herbicola, São Paulo birds of which respond to it, and this group is best kept within the species E. herbicola. The genus Embernagra is closely similar to Emberizoides in plumage, and in structure, and may prove congeneric with it. Three species, monotypic Emberizoides duidae, polytypic E. herbicola, and monotypic E. ypiranganus thus seem seperable within Emberizoides. Factors involved in their evolutionary jistory are mentioned"--P. [1].