Vol. XXV, pp. 97-102 May 4, 1912 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON / DIAGNOSES OF SOME NEW GENERA OF AMERICAN-BIRDS . RY ROBERT RIDGWAY, Curator, Division of Birds, U. S. National Museum. [Published by permission of the Secretary of the Smithsonian Institution.] In preparing keys to the genera of families to be included in Part VI of the "Birds of North and Middle America," the writer has found it necessary to establish several new groups, which are briefly diagnosed below. Ecchaunornis gen. nov. Type, Bucco radiatus Sclater. Similar to Nyslalus Cabanis and Heine,* but differing in relatively much shorter and less compressed l>ill (culmen, from base, much less than half as long as wing), its width at nostrils equal t<> about one-third the length of exposed culmen. (Ekxo-vvoui, T puff up; 8pvis, a bird. ) Species: Ecchaunornis radiatus (Sclater); Ecchaunornis radiatus ful-i idus (Salvin and Godman ). Systellura gen. nov. Type. Stenopsis ruficervix Sclater. Nearest Stenopsis, but differing in the relatively much shorter and less distinctly emarginate tail and very different style of coloration, the sexes not conspicuously different in color and the adult male with lateral rec-trices not mostly white. ( I would restrict Steno]>sis to S. cayennensis, with, possibly, *S'. candi-cans, a species I have not been able to examine. ) (2u<ttA\w, to abridge; ovpd, tail.) Species: Systellura ruficervix (Sclater). * Xystalus Cabanis and Heine, Mus. Hein., iv, Heft. 1, Jan.. 1863, 139. Type, Alcedo maculata Gmelin. 17— Proc. BlOL. SOC. Wash., Vol.. XXV, 1912. , (9/j
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