Ridgway American Families of Oligomyodian Passer es. 13 



the ninth ; the basal phalanx of the middle toe is completely united to the 

 outer toe and almost wholly adherent to the middle toe, thus agreeing, as 

 in the wing-structure, with the Vireonidse. In fact, except for its depressed 

 and broadly triangular " flycatcher "-like bill, the bird is minutely similar 

 to Vireo pusillus. 



2. Stigmatura Sclater and Salvin. 

 (Type, Culicivora budytoides D'Orbigny and Lafresnaye.) 



This bird resembles in general form and appearance the Formicariine 

 genus Formicivora, and probably belongs to the same family. 



3. Hapalocercus Cabanis. 

 (Type Euscarthmus meloryphus Maximilian.) 



This also is possibly Formicariine in its relationships. One species has 

 been referred to it which has the typical Tyrannine exaspidean tarsus and 

 therefore can not be congeneric. This is Alectrurus flaviventris D'Orbigny 

 and Lafresnaye {Hapalocercus flaviventris Cabanis, Sclater, and others), 

 type of the genus Myiosympotes Reichenbach (Av. Syst. Nat., 1850, pi. 65), 

 and therefore to be known as Myiosympotes flaviventris. I have not seen 

 H.falviceps (Euscarthmus fulviceps Sclater) nor H. aculipennis Sclater and 

 Salvin, and therefore can not say whether they are congeneric with H. 

 melacoryphus or not ; but the former doubtless is, since what is said to be 

 a very near relative, H. paulus Bangs, is a true Hapalocercus. 



4. Habrura Cabanis and Heine. 

 (Type, Sylvia pectoralis Vieillot.) 



The tarsal envelope of Habrura, while less typically taxaspidean than 

 that of Hapalocercus is by no means exaspidean. The inner side of the 

 planta tarsi consists of a single continuous series of well-defined quadrate 

 scutella; but on the outer side of the tarsus the acrotarsium extends quite 

 to the posterior edge except for the upper third, where three or four rather 

 large and very distinct longitudinal scutella occupy approximately the 

 posterior half. The last character is seen in many typical Tyrannidse ; but 

 in none of the latter is there ever any indication of the well-defined and 

 continuous series of scutella along the posterior half of the inner side of 

 the tarsus. The nostrils in Habrura are quite different from those of 

 Hapalocercus, being roundish and nonoperculate while in the latter they 

 are more longitudinal, relatively larger, and overhung by a rather large 

 membraneous operculum. The proper place for these two genera is a 

 question which I am not able to decide, but Habrura may not be out of 

 place in the Cotingidse while, as suggested above, Hapalocercus may belong 

 to the Formicariidse. 



5. Muscigralla D'Orbigny and Lefresnaye. 

 (Type, M. brevicauda D'Orbigny and Lafresnaye.) 



The appearance of this very peculiar form does not in the least suggest 

 to me any relationship with the Tyrannidse, while its holaspidean tarsi 

 certainly exclude it from that family. Possibly it is a Formicarian. 



