Bird Census at Washington, D. C. 21 



Several migrant birds, for which May 12 is an unusually 

 late date, were also observed, as noted below, the dates after 

 each being the latest known previous records for this region : 



Greater yellow-legs. May 16, 



Least sandpiper, May 15, 



Red-breasted nuthatch, May 12, 



Solitary vireo, May 18. 



For three other species the latest record of spring occurrence 

 was extended, these species with their previously recorded 

 dates being as follows : 



Pied-billed grebe, April 24, 



Yellow-legs, May 11, 



Yellow palm warbler. May 1. 



The itinerary of each of the thirteen parties engaged in this 

 survey was as follows : 



1. — Great Falls, Virginia: By electric car from Washing- 

 ton, D. C., to Great Falls and return. Traveled on foot, 14 

 miles in the region about Great Falls on the Virginia side of 

 the Potomac river. Total distance traveled, 46 miles. Time 

 in field, 4 :00 a. m. to 8 :40 p. m. Total number of species ob- 

 served, 82 ; individuals, 623. A. Wetmore. 



2. — Washington, D. C., to Great Falls, Maryland : By au- 

 tomobile to Great Falls and return. Total distance traveled, 

 32 miles. Time in field, 7 -.00 a. m. to 5 :00 p. m. Total num- 

 ber of species observed, 68 ; individuals, 728. V. Bailey and 

 Mrs. V. Bailey. 



3. — Valley of the Potomac river in Virginia, from Elkins 

 and Difficult Run to Chain Bridge ; and the District of Colum- 

 bia, from Fox Hall Road to Observatory Heights, D. C. : 

 By electric car from Washington, D. C, to Elkins, Virginia. 

 Traveled on foot, 22 miles, from Elkins, Virginia, to Observa- 

 tory Heights, D. C. Total distance traveled, 55 miles. Time 

 in field, 4 :00 a. m. to 8 :00 p. m. Total number of species ob- 

 served, 73 ; individuals, 701. E. A. Preble and W. L. McAtee. 



4. — Potomac Valley, on the Virginia side, from Georgetown, 



