Description of the Figtires. 59 



PLATE VII. 



Fig. 1. Syrinx of Menvra svperla from in front. 



Fig. 2. The same from behind. 



Fig. 3. The same laterally (right side). 



Fig. 4. Syrinx of Atrichia rufescens from in front. 



Fig. 5. The same from behind. 



Fig. 6. The same laterally (right side). 



Fig. 7. The syrinx of Lipaugus cineraceus. Left side. 



Fig. 8. The same, front view. 



Fig. 9. The syrinx of Hadrostomus aglaiae, front view. 



PLATE VIII. 



Fig. 1. Syrinx of Grallaria guatemalensis, posterior view. 



Fig. 2. The same, anterior view. 



Fig. 3. Processus vocalis of the same. 



Fig. 4. Syrinx of Hylactes megapodius, front view. 



Fig. 5. The same, back view. 



Fig. 6. The syrinx of Coracina scutata, front view. 



Fig. 7. The same, back view. 



Fig. 8. The syrinx oi Pitta cyanura from in front. 



Fig. 9. The same from behind. 



Fig. 10. The same laterally (right side). 



Fig. 11. The syrinx of Pitta angolensis, front view. 



Fig. 12. The same from behind. 



Fig. 13. The same laterally (right side). 



I 2 



