88 BIRDS. 
Order 8. PYGOPODES. 
Fam. COLYMBIDZ. 
373. Colymbus glacialis Z. Great Northern Diver. 
Winter visitant, not uncommon, but still not numerous. 
Most frequent on the coast, but also occurs inland, 
though rarely. Arrives in September, leaves early in 
spring. 
374. Colymbus arcticus Z. Black-throated Diver. 
Winter visitant, of uncommon occurrence, on the coast and 
inland. Appears to be rather more frequently observed 
inland than C. g¢éacialis, whilst it is much the rarer of the 
two on the coast. 
375. Colymbus septentrionalis Z. Red-throated Diver. 
Winter visitant, common on the coast, and regularly appears 
at that season on many inland waters, but not numerously. 
May be found off the coast all the year round—probably 
young of the previous year not breeding. 
Fam. PODICIPITIDE. 
376. Podiceps cristatus (Z.). Great Crested Grebe. 
Resident, about half-a-dozen pairs breeding regularly at 
Hornsea Mere; the late Mr. Hugh Reid informed Mr. 
More in 1865 that it occasionally bred in the West Riding. 
Those nesting at Hornsea retire to the sea and Humber on 
the approach of severe weather. Also a winter visitant, 
observed both inland and on the coast, but far from 
commonly. 
377. Podiceps griseigena (Bodd.). Red-necked Grebe. 
Winter visitant, uncommon, but not unfrequent in severe 
seasons, when it occurs both on the coast and inland, from 
September to March. Examples have occurred in almost 
full summer plumage. 
