. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Classification of Tyrant Flycatchers • Trayhr 157 maries and converged on in this character. The relatively long Atalotriccus tarsns is more like that of hlioptilon than that of Lophotriccus. Eisenniann {in litt.) believes Atalotriccus behaves more like Todirostrum sylvia than like Lophotriccus. Considering the donbts about the origin of Atalotriccus, I accept it as a distinct genus. Since this tody-tyrant group is uniform in cranial and syringeal characters, I doubt if further anatomical study will help c
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Classification of Tyrant Flycatchers • Trayhr 157 maries and converged on in this character. The relatively long Atalotriccus tarsns is more like that of hlioptilon than that of Lophotriccus. Eisenniann {in litt.) believes Atalotriccus behaves more like Todirostrum sylvia than like Lophotriccus. Considering the donbts about the origin of Atalotriccus, I accept it as a distinct genus. Since this tody-tyrant group is uniform in cranial and syringeal characters, I doubt if further anatomical study will help clarify the relationships. Fitzpatrick (1976) has just published a valuable paper on Todirostrum and related genera. He construed somewhat more strictly the concept of "related genera," and his study omits the following genera listed above: Hemitriccus, Myiornis, Atalotriccus, Colopteryx and Lophotriccus. Fitzpatrick attempted to trace the lineage and generic relationships of his tody-tyrants, and he made the following taxonomic suggestions: 1. The genus Ceratotriccus should be merged with Idioptilon. 2. The genera Taeniotriccus and Poecilo- triccus should be moved to positions im- mediately preceding Todirostrum, reflect- ing their affinities with Todirostrum capitale. 3. Todirostrum and Idioptilon should continue to stand as separate genera. 4. The genera Snetldai^aea and Micro- cochJearius are best merged with IdioptiJon^ while Oncostoma should continue to be generically recognized. Fitzpatrick's lineage is shown diagram- matically in Figure 5, reprinted from his Figure 4 (p. 443). The genera that he does not consider, Myiornis, Atalotriccus, Colop- teryx and Lophotriccus, would branch off further down the stem, on the way to the more highly specialized Todirostrum. \\^ith the exception that I consider Hemitriccus to belong to the "green" section of Idiopti- lon, I believe Fitzpatrick's tree accurately depicts the evolution and relationships of the tody-
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