80 BULLETIN 51, UNITED STATES NATIONAL MUSEUM. 



P. 777. The palaeolithic period in the District of Columbia. By 

 Thomas Wilson. 



pp. 371-376, 2 pis. 



P. 778. Notes on a third collection of birds made in Kauai, Hawaiian 

 Islands, by Valdemar Knudsen. By Leonhard Stejneger. 



pp. 377-386. 



P. 779. Descriptions of new Ichneumonidee in the collection of the 

 U. S. National Museum. By William H. Ashmead. 



pp. 387-451. 



P. 780. Description of the yellow-finned trout of Twin Lakes, Colo- 

 rado. By David S. Jordan and Barton W. Evermann. 



pp. 453-454. 



P. 781. Contributions toward a monograph of the Noctuidee of tem- 

 perate North America. Revision of some taeniocampid 

 genera. By John B. Smith. 



pp. 455-4%, 2 pis. 



P. 78^. Catalogue of the described Aranese of temperate North 

 America. By George Marx. 



pp. 497-594. 



P. 783. Notes on the serpentinous rocks of Essex County, New York; 

 from Aqueduct shaft 26, New York City; and from near 

 Easton, Pennsylvania. By George P. Merrill. 



pp. 695-600. 



P. 784. A revision of the genus Araucarioxylon of Kraus, with com- 

 piled descriptions and partial synonymy of the species. By 

 F. H. Knowlton. 



pp. 601-617. 



P. 785. Notes on North American crayfishes family Astacidae. By 

 Walter Faxon. 



pp. 619-634. 



P. 786. Description of two new species of bats Nyctinomus europs 

 and N. orthotis. By Harrison Allen. 



pp. 635-40. 



P. 787. Scientific results of explorations by the U. S. Fish Commis- 

 sion steamer Albatross. No. VIII. Description of a new 

 cottoid fish from British Columbia. By Tarleton H. Bean. 



pp. 641-642. 



P. 788. Description of a new lizard from Lower California. By Leon- 

 hard Stejneger. 



pp. 643-644. 



P. 789. Scientific results of explorations by the U. S. Fish Commis- 

 sion steamer Albatross. No. IX. Catalogue of fishes col- 

 lected at Port Castries, St. Lucia, by the steamer Albatross^ 

 November, 1888. By David S. Jordan. 



pp. 645-652. 



