8U BULLETIN 51, UNITED STATES NATIONAL MUSEUM. 



P. 777. The palieolithic period in ttie District of Columbia. By 

 Tliomiis 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 Ichneumonidfe in the collection of the 

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



pp. 387-151. 



P. 780. Descrix)tion of the yellow-finned trout of Twin Lakes, Colo- 

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



pp. 453-154. 



P. 781, Contributions toward a monograph of the Noctuidse of tem- 

 perate North America. Revision of some tseniocampid 

 genera. By John B. Smith. 



pp. 455-496, 2 pis. 



P. 782. Catalogue of the described Aranete 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. 595-600. 



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

 piled descriptions and partial synonymy of the speciSs. By 

 F. H. Knowlton. 



pp. 601-617. 



P. 785. Notes on North American crayfishes — family Astacidse. By 

 Walter Faxon. 



pp. 619-634. 



P. 786. Description of two new species of bats — Nyctlnomus europs 

 and ]Sf. orthotis. By Harrison Allen. 



pp. 635-640. 



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

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

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



pp. 611-642. 



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

 hard Stejneger. 



pp. 643-644. 



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

 sion steamer Alhatross. 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. 



