32 CATALOGUE OF THE BIRDS OF KANSAS, 
Genus HyDROCHELIDON, Boie. 
316. H. lariformis surinamensis (Gmel.) Ridgw. Black Tern. Mi- 
gratory; quite common; may occasionally breed in northern Kansas. 
Order PYGOPODES. 
Family PODICIPEDIDZ. 
Genus Dytes, Kaup. 
317. D. auritus (Linn.) Ridgw. Horned Grebe. Migratory; very 
rare. 
318. D. nigricollis californicus (Heern.) Ridgw. American Eared 
Grebe. Migratory; rare in eastern, common and may occasionally breed 
in western Kansas. 
Genus Popitymsus, Lesson. 
319. P. podiceps ( Linn.) Lawr. Thick-billed Grebe. Migratory ; 
common; may occasionally breed in northern Kansas. 
Family COLYMBIDAt.—Loons. 
Genus CoLympBus, Linnzeus. 
320. C. torquatus, Brinn. Great Northern Diver—Loon. Migra- 
tory. rare. 
