374 ON THE ANATOMY OF PASSERINE BIRDS. 
Suborder TRAcHEOPHONA. 
Fam. 1. Dendrocolaptide. 
Subfam. 1. Furnariine. 
Subfam. 2. Sclerurine. 
Subfam. 3. Synallaxine. 
Subfam. 4. Philydorine. 
Subfam. 5. Dendrocolaptinz. 
Fam. 2. Formicariide. 
Fam. 3. Pteroptochide. 
To me it would appear that the following arrangement, better re- 
presents their mutual alliances :— 
Suborder TRACHEOPHONS. 
Fam. 1. Furnariide. 
Subfam. 1. Furnariine. 
Subfam. 2. Sclerurine. 
Subfam. 3. Synallaxine. - 
Subfam. 4. Philydorine. 
Fam. 2. Pteroptochide. 
Fam. 3. Dendrocolaptide. 
_Fam. 4, Conopophagide. 
Fam. 5. Formicariide. 
59. NOTES ON THE ANATOMY OF PASSERINE BIRDS. 
Part III.* 
(Plate XXVII.) 
Page 523. ON the present occasion I take the opportunity of describing the 
voice-organ in some species of the non-oscinine (mesomyodian) Pas- 
seres in which that structure is, so far as I am aware, unknown. 
Leaving any deductions until I have recorded the nature of the 
structures, I will commence with an account of the syrinx in some of 
the Tracheophone. 
Hylactes megapodius.—In this species the syrinx is not identical 
with any of those described by J. Miiller.f It does not differ much 
from those of Scytalopus indigoticus and Chameza brevicauda in its 
essential structure. By Miiller, however, no mention is made of a 
peculiarity which I find in this species, which seems to me to throw 
* “Proceedings of the Zoological Society,” 1877, pp. 523-6. Pl. LILI. Read 
June 5, 1877. 
+ “Abh. Akad. der Wissenschaften zu Berlin,” 1847. 
. 
