14 Ridguxiy — American Families of Oligomyodian Passeres. 



6. Sirystes Cabanis and Heine. 

 (Type, Muscicapa sibilator Vieillot.) 



This genus has the arrangement of the tarsal envelope precisely as in the 

 Cotingine genera Lipaiigus and Casiornis, and if these belong to the Co- 

 tingidse there can be no doubt that Sirystes does also. 



7. "Myiarchus" validus Cabanis. 

 (Type of genus Hylonax Ridgway.) 



The same remarks apply to this as to Sirystes, and I would place Hylonax 

 between the above-named genera and Attila. 



8. " Pogonotriccus " zeledoni Lawrence. 

 (Type of genus Idiotriccus Ridgway.) 



In this curious form the tarsus may be called ultra-pycnaspidean, for not 

 only the planta tarsi but also the lower portion of the acrotarsium is 

 broken up into numerous small scutella, which on the lower portion of the 

 tarsus are almost tuberculate. I have not seen the type species of the 

 genus Pogonotriccus Cabanis and Heine {Muscicapa eximia Temminck) 

 and therefore can not say whether the latter is Tyrannine or not. The 

 only species commonly referred to the genus that I have been able to ex- 

 amine, besides Idiotriccus zeledoni, is P. plumbeiceps Lawrence, which von 

 Berlepsch places in the genus Tyranniscus Cabanis and Heine, an allocation 

 in which I entirely agree. 



9. "Elainea" gaimardi (D'Orbigny). 

 {Muscicapa gaimardi D'Orbigny, = Elainea elegans Pelzeln, type of genus 



Elainopsis Ridgway.) 

 This bird, while superficially resembling very closely the Tyrannine 

 genus Myiopagis Salvin and Godman has essentially pycnaspidean tarsi, 

 the acrotarsium extending only a little more than half way across the outer 

 side of the tarsus and the planta tarsi covered with minute scutella. I 

 therefore refer it to the Cotingidse. 



10. Tyrannulus Vieillot. 

 (Type, Sylvia elata Latham.) 

 This also has essentially pycnaspidean tarsi, and for that reason is trans- 

 ferred from the Tyrannidse to the Cotingidse. T. semiflavus Sclater and 

 Salvin while agreeing in pycnaspidean tarsi is very different otherwise and 

 is the type of my genus Microtriccus. 



11. Ornithion Hartlaub. 

 (Type. 0. inerme Hartlaub.) 

 This also has pycnaspidean tarsi and is most nearly related to Micro- 

 triccus. The bill in both these genera, but especially in Ornithion, is de- 

 cidedly Cotingine in form. Ornithion is, so far as known, monotypic, the 

 other species commonly referred to it being true Tyrannidae (having exas- 

 pidean tarsi) and constitute the genus Camptostoma Sclater. 



