246 TRANSACTIONS OP THE [1895 



it goes westward. The country north and south of this valley 

 is very uneven and high (560 feet in some places). 



Messrs. G. H. Gray and P. T. Blogg, working to the west of 

 the city, have quite a different country, most of their observations 

 being made in the rocky, heavily timbered gorge of Gwynn's 

 Falls, between Calverton and Powhattan. The bed of the falls 

 at Calverton has an elevation of 80 feet, and at Powhatan dam 

 of 320 feet, the country on both sides ranging from 300 to 

 500 feet. 



Mr. A. Resler takes another field, collecting a good deal on 

 Patapsco marsh, just south of the city, also "down the necks/' 

 and near Botterill Post-Office, in Howard County, 14 miles 

 from Baltimore. 



Order PYGOPODES DIVING BIRDS. 



Family PODICIPID^E Grebes. 

 Colymbus holboellii (2). Holbcell's Grebe. 



"Not uncommon on the Potomac in winter" (A. C., 110), 

 this species has been taken in Lancaster County, Pa., and at 

 other points in Pennsylvania and New Jersey (Birds E. Pa. 

 and N. J., 38), so I presume it occurs all over tide water 

 Maryland. On February 25, 1894, 1 watched one for about an 

 hour at Lake Roland where it was swimming around in a hole 

 in the ice, which otherwise covered the lake. Later, when we 

 threw stones at it, it would neither fly nor dive, so we left it. 



Colymbus auritus (3). Horned Grebe. 



Fairly common in tide-water Maryland during migrations, 

 a number winter with us. 'Noted from October 7 ('76, Resler) 

 at Back" River, to April 23 ('90, Resler), at the same place. 

 April 25, at Washington, D. C. (Richmond). Inland, a young 

 male, shot at New Market, Carroll County, by Dr. H. H. Hop- 

 kins, was presented in the flesh on February 21, '81, to the 

 Maryland Academy of Sciences. A pair, male and female, 

 were taken at Hagerstown on April 16, '83 (Small), and Mr. 

 Robert Shriver has secured specimens at Cumberland. 



