II 4 



Lucas on the Tongues of Birds. 



"Auk 

 . April 



EXPLANATION OF FIGURES. 



1. Macroptcryx corona ta. 



2. Collocalia sp. 



3. Tachycineta bicolor. 



4. Tachomis gracilis. 



5 . Hirundo puella . 



6. Priotelus temnurus. 



7. Ampelis cedrorum. 



8. Passer donies/ic/is. 



9. Melospiza georgiana. 



10. Melospiza lincolni. 



1 1 . Melospiza georgiana. 



1 2 . Melospiza fascia fa. 



12 a. Melospiza fasciatu. Tip of 

 tongue much enlarged. 



These figures have been drawn with the camera lucida, all being 

 enlarged to about the same absolute size to facilitate comparison. 



[Reference having been made by Mi - . Lucas to some remarks of mine 

 on the subject here under discussion, I trust he will pardon me for adding 

 a few words to his excellent paper on the taxonomic value of birds' 



