. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 200 Bulletin Museum of Comparative Zoology, Vol. 141, No. 5 "15 -10 0 .05 .10 I I I I I I I I I I I I I I I I I I I I I I M I I WING \ TAIL \ TARSUS / • / / CUL- / MEN^. —"A. murina •^— (NW Argentina) •• - — A. livida I I 6 6 STAN DARD of COMPARISON ' (Ecuador): Fig. 10. Ratio-diagram illustrating the relative proportions of the five species of the genus Agriornis. Agr/'orn/s murina, although smallest in absolute measurements, is similar in proportions to the
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 200 Bulletin Museum of Comparative Zoology, Vol. 141, No. 5 "15 -10 0 .05 .10 I I I I I I I I I I I I I I I I I I I I I I M I I WING \ TAIL \ TARSUS / • / / CUL- / MEN^. —"A. murina •^— (NW Argentina) •• - — A. livida I I 6 6 STAN DARD of COMPARISON ' (Ecuador): Fig. 10. Ratio-diagram illustrating the relative proportions of the five species of the genus Agriornis. Agr/'orn/s murina, although smallest in absolute measurements, is similar in proportions to the four other species. Two geographically distant populations of A. montono (from NW Argentina and Ecuador) are included to show geographical variation in proportions. cies of Agriornis, and is not closely related to any of the four other species in the genus. A. murina lives in the open steppes of Patagonia. The Genus Musc/'sox/co/o Diagr\os\s A genus of twelve to thirteen species of small- to medium-sized flycatchers char- acterized by pale gray or sandy brown plumage, unpatterned except for a species- specific crown spot (Fig. 1) that either varies from vellow to ochre and chestnut or is absent, and a whitish or buffy outer edge to the outermost pair of rectrices. In fresh plumage, the tip of the tail is edged with pale gray, whitish, or pale buff, but in worn plumage, this edge may be altogether lacking. Muscisaxicola (including MuscigroUa) is a rather well-defined genus, with no close affinities with other tvrannid genera. Xolmis pijrope, although arboreal, actually resembles Muscisaxicola in having a similar Juvenal plumage, in lacking a color pattern (it is uniformly gray), and possibly also in vocalizations (Smith). The monotypic Lessonia rufa (placed by Hellmayr, 1927, immediately after Muscisaxicola), although strikingly dimoiphic, has some resemblance to Muscisaxicola in mannerisms, bill shape, and female plumage, but this could be convergence, since Lesso
Size: 1307px × 1912px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
