CONTENTS. 



Page 

 No. 1. A SECTION IN THE TrENTON LIMESTONE AT MaRTINSBURG, 



New York. By Thomas H. Clark. (1 plate). May, 1919 1 



No. 2. — Some critical notes on birds. By Outram Bangs and 



Thomas E. Penard. June, 1919 19 



No. 3. — The ants of Borneo. By William Morton Wheeler. July, 



1919 .41 



No. 4. — Reports on the scientific results of the expedition 

 TO the Tropical Pacific in charge of Alexander 

 Agassiz, on the U. S. Fish Commission Steamer 

 "Albatross,'' from Augu.st, 1899, to March, 1900, 

 Commander Jefferson F. Moser, u. s. n., commanding. 

 XXI. The birds. By Charles Haskins Townsend and 

 Alexander Wetmore. August, 1919 .... 149 



No. .5. — The Psammocharidae op western North America. By 



Nathan Banks. September, 1919 227 



No. 6. — Pacific coast Polychaeta collected by Alexander 

 Agassiz. By Ralph V. Chamberlin. (3 plates). Novem- 

 ber, 1919 249 



No. 7. — The ants of the British Solomon Islands. By William 



M. Mann. (2 plates). December, 1919 . . .271 



No. 8. — Some amphibians from northwestern Peru, with a revi- 

 sion of the genera Phyllobates and Telmatobius. 

 By Thomas Barbour and G. K. Noble. (3 plates). Jan- 

 uary, 1920 . .393 



No. 9. — Dogs of the American aborigines. By Glover M. Allen. 



(12 plates). March, 1920 429 



