5 8 Descriptio7i of the Figiires. 



Fig. 9, 10. Larynx of Colius capensis, from in front, x 4. 



a. Musculus sternotrachealis. b. First large bronchial ring, with its scutiforin pro- 

 longation, c. Laryngeal muscle to the scutiform prolongation of the first bronchial ring. 

 d. Fasciculi of the same muscle for the three following half-rings. 



Fig. 11, 12. The same larynx, from the side. The letters as before. 



PLATE VI. AMPELIS, RUPWOLJ, GYMNOCEPHALUS, PSARIS, 

 PACHYRHAMPHUS, CENTRITES, FLUVICOLA, BENBROCOLAPTES, CHAMAEZA, 



CONOPOPHAGA. 



Fig. 1, 2. Lar)Tix of Amjielis pompadora, x 6. 



a. Lateral muscle of the trachea. I. M. sternotrachealis. 

 Fig. 3. Larynx of Rupicola cai/ana, from the side, x 2. 



a. Lateral muscle of the trachea. I. M. sternotrachealis. 

 Fig. 4. Larynx of Gi/mnocephalus calvus GeofFr. 



a. Lateral muscle of the trachea, b. M. sternotrachealis. 

 Fig. 5. Larynx of Psaris cay anus, x 2 ; from in front. Letters as before. 

 Fig. 6. Larynx of Pachi/rhamphus atricapillus Cab. [Pipra atricapilla Gm., Lanius 

 mitratus Lieht.), x 4 ; from in front. 



a. Lateral muscle of the trachea, b. M. sternotrachealis. c. Laryngeal muscle to 

 the second bronchial ring. 



Fig. 7. Larynx of Centrites rufus Cab. {Alauda rufa aut.) ; from in front ; magnified. 



a. Lateral muscle of the trachea, covering it anteriorly, c. Laryngeal muscle. 

 Fig. 8. Larynx of Fluvicola bicolor {Miiscicapa bicolor L. Gm., 31. albiventris Spix.), 

 from in front; magnified. 



a. Lateral muscle of the trachea, covering it anteriorly, c. Laryngeal muscle. 

 Fig. 9. The same larj'ux from below. 



a. Pessulus. b. Cartilago arytaenoidea. c. Tympanic membrane. 

 Fig. 10. Larynx of Bendrocolaptes cayennensis ; from in front; magnified. 



a. Membranous portion of the trachea, b. Fine tracheal rings in it. c. Vocal 

 ossicles, d. e. The first two bronchial rings. /'. Lateral muscle of the trachea, g. Anterior 

 laryngeal muscle to the vocal ossicles, h. Musculus sternotrachealis. 



Fig. 11. Larynx of Chamaeza meruloides Vig. ; from in front : magnified. 



a. Membranous portion of the trachea, b. Its fine rings, c. Vocal cartilage, d. e. The 

 first two bronchial rings. /. Lateral muscle of the trachea, h. 31. sternotrachealis. 

 Fig. 12. Larynx of Conopophaga aurita Vieill. ; from in front : magnified. 



a. Membranous portion of the trachea, with its five rings b. c. Lowest tracheal 

 rino'. d. e. The first two bronchial rings, h. 31. sternotrachealis. i. Band. 



