16 Ridgway American Families of Oligomyodian Passeres. 



than the Cotingidae of Dr. Sclater. Those genera of Cotingidae 

 possessing non-pycnaspidean tarsi present three recognizably 

 different types of scutellation of the planta tarsi ; two of these 

 types approach most nearly to the holaspidean and taxaspidean, 

 but for the third, in which the whole planta tarsi consists of 

 smooth integument, I am unable to find a distinctive term. 



If certain genera (as Lipavgus, Casiornis, Lathria, and Attila) 

 which by nearly universal usage are placed in the Cotingidae 

 really belong to that group, then most certainly do certain 

 genera usually referred to the Tyrannidae also belong there, for 

 the character of the tarsal scutellation is essentially if not pre 

 cisely similar. These genera, Sirystes, Ramphotrigon , * and 

 Hylonax (type, Mylarchus ' validus Gosse) I therefore add to the 

 Cotingidae, as well as others which possess essentially pycnas- 

 pidean or at least non-exaspidean tarsi, namely, * l Pogonotriccvs ' ' 

 zeledoni (type of genus Idiotriccus Ridgway), " Elccinca " or 

 *' Myiopagis " gaimardi (type of Elainopsis Ridgway), Tyrannu- 

 lus elatus, ** Tyrannidus" semiftavus (type of Microtriccus Ridg 

 way), and Ornithion possibly also Habrura. There should 

 also be added a supposedly Piprine genus, Rilochloris (or Lanii- 

 so?7ia), which has neither the exaspidean tarsus nor great syn- 

 dactylism of the Pipridae. At the same time, the exclusion from 

 Cotingidae and addition to Pipridae of the genus Aidia (or 

 Laniocera) is made necessary, since its foot-structure and tarsal 

 scutellation is typically Piprine. 



* Equals Rhynchocyclus, part, of Dr. Sclater. Ramphotrigon Gray, Cat. Gen. and Subgen. 

 Birds, 1865, 146, ex " Pr. B [onapartej 1854." (Type, Platyrhynchus ruficauda Spix.) 



