204 Proceedings of the Biological Society of Washington. 



Perissotriccus Oberholser,* proposed for Orchilus ecaudatus 

 (Lafresnaye) and Orchilus atricapillus (Lawrence), is generi- 

 cally distinct from Orchilus auricularis (Vieillot) and Orchilus 

 albiventris Berlepsch and Stolzmann. Mr. C. E. Hellmayr 

 has recently stated! that Orchilus albiventris% is intermediate 

 between Orchilus auricularis and Orchilus ecaudatus, the 

 type of Perissotriccus, and therefore that the genus Peris- 

 sotriccus is invalid. A careful examination of the species in 

 question shows, however, that Orchilus albiventris has structural 

 proportions identical with Orchilus auricularis, being, moreover, 

 very much like it in color, and, therefore, is strictly congeneric, 

 not by any means intermediate between it and Perissotriccus 

 ecaudatus. This may be readily verified by reference to the 

 original diagnosis of Perissotriccus Oberholser§ and the meas- 

 urements of the species in question. Since the two species, 

 Orchilus auricularis and Orchilus albiventris, which form the 

 present genus Orchilus after the removal of the species of 

 Perissotriccus, are thus without a generic designation, we here 

 propose for them the name Notorchilus,** and designate as its 

 type Platyrhynchus auricularis Vieillot. 



By this arrangement the species heretofore included in the 

 genus Orchilus Cabanis will stand as follows: 



Notorchilus auricularis auricularis (Vieillot). 



Notorchilus auricularis pyrrhotis (Berlepsch). 



Notorchilus albiventris (Berlepsch & Stolzmann). 



Perissotriccus ecaudatus (D'Orbigny & Lafresnaye). 



Perissotriccus atricapillus (Lawrence). 



• Proc. U. 8. Nat. Mus., XXV, Aug, 30, 1902, p. 64. 

 ■hNovit. Zool., XIII, No. 1, February, 1906, p. 22. 



X Orchilus albiventris Berlepsch and Stolzmann, Ibis, series 6, VI, No. XXIII, July, 

 1894, p. 389 (La Merced, east central Peru). 



§Proc. U. S. Nat. Mus., XXV, August 30, 1902, p. 64. 

 **vbrot, meridies; dpx^os, regulus. 



