294 On the Coloration of the Mouths of Birds. 



Fig. 8. P)-mia mystacea, mouth of nestling ; 8 a, of adult ; 8 6, of 



intermediate stage. 



Fig. 9. Chloropeta natalensis, mouth of nestling (for adult see 



fig. 33). 



Fig. 10. Cistieola cinerascens, nestling just hatched. Fig. 11, mouth of 



adult. 



Fig. 12. Cistieola natalensis, mouth of adult (nestling, fig. 6). 



Fig. 13. Hi/phantornis jatnesoni, mouth of nestling (adult, fig. 18). 



Fig. 14. Chrysococcyx sp., mouth of nestling found with no. 13. 



Fig. 15. Pycnonotus layardi, mouth of nestling (adult, fig. 38). 



Fig. 16. Lanins humeralis, mouth of nestling (adult, fig. 47). 



Fig. 17. Colius striatus minor, mouth of nestling ; 17 a, of adult. 



Fig. 18. Hyphantomis jamesoni, mouth of adult (nestling, fig. 13). 



Fig. 19. Macronyx croceus, mouth of nestling. Fig. 20, of adult. 



Fig. 21. Ce7itropus hurchelli, mouth of nestling. 



Fig. 22. Cinnyris veniistus niassce, mouth of adult. Fig. 23, of nestling. 



Fig. 24. Chalcopelia afra, part of mouth of nestling. 



Fig. 25. Turttir capicola damarensis, mouth of nestling. 



Fig. 25 «. Dryoscopus gutlatus, mouth of nestling just hatched; 25 b, 



tongue of immature ; 25 c, of adult § ; 25 d, of adult ^ . 



Fig. 26. Turdiis viscivorus, mouth of nestling. 



Fig. 27. Tardus libonianus tropicalis, mouth of adult. 



Fig. 28. Sifftnodas tricolor, mouth of adult. 



Fig. 29. Campephaga nigra, mouth of adult cJ . 



Fig. 30. Alaiida arvensis, mouth of nestling. 



Fig. 31. Telephonus senegalus, mouth of adult. 



Fig, 32. Crateropus kirki, mouth of adult. 



Fig. 33. Chloropeta natalensis, mouth of adult (nestling, fig. 9). 



Fig. 34. Laniaritis sp., mouth of adult. 



Fig. 35. Bradiornis murinus, mouth of adult. 



Fig. 36. Trochocercus albonotatus swynnertoni, mouth of adult. 



Fig. 37. Dicrurus ludwigi, mouth of adult. 



Fig. 38. Pycnonotus layardi, mouth of adult (nestling, fig. 15). 



Fig. 39. Phyllostrophusjlavistriatus, mouth of adult. 



Fig. 40. Anthus pyrrhonotus, mouth of adult. 



Fig. 41. Trochocercus sp., mouth of adult. 



Fig. 42. Trachyphontis cafer, mouth of adult (f nat. size). 



Fig. 43. Rhinopomastus cyanomelas, mouth of adult. 



Fig. 44. Trachxjphonus cafer, tongue of an immature. 



Fig. 45. Irrisor erythrorhynchtis, mouth of adult S • 



Fig. 46. Vinago delalandei, mouth of adult. 



Fig. 47. Lanius humeralis, mouth of adult (nestling, fig. 16). 



