BED-THEOATED DIVEE, 565 



ture seems almost certain. On the Ohio river I have seen them in great 

 numbers when they seemed to take pleasure in accompanying steam- 

 boats, swimming along side, and often diving under. When diving their 

 movements are more like those of a turtle than those of a bird, the legs 

 moving in the horizontal plane of the body, and the wings assisting 

 with short flaps, executed by moving the proximal joints only. 



CoLYMBDS AKOTicus Linuseus. 



Blaclz-tliroatecl JDiTer* 



Back and nndei-parta much as in the last species ; npper part of head and hind neck, 

 iluiah-ash or hoary-gray ; fore neck pnrplish-black. The young resemble those of that 

 species but will be known by their inferior size. Length, under 2J feet ; extent, about 

 3; wing, 13 or less; taisas, 3; bill, about 3^. 



Habitat, Northern Hemisphere. 



Very rare or accidental visitor, now first given as'^^a bird of Ohio. Mr. , 

 H. E. Chubb writes : " I mounted one specimen for a gentleman in 

 Garrettsville last fall [1880]. It was shot in Sandusky Bay. This is the 

 only specimen I have seen." 



COLYMBUS SEPTENTEIONALIS LinUffiUS. 



K.ed-tlrroa,ted Uiver, 



Colymbua septmtrionalis, Wheaton, Ohio Agrio. Eep. for 1860, 371, 379; Keprint, 1861, 

 13, 21 ; Food of Birds, ete., Ohio Agrio. Rep. for 1874, 575 ; Eeprint, 1875, 15.— 

 Lajsgdon, Cat. Birds of Cin., 1877, 18 ; Eevised List, Jonm. Cin. Soe. Nat, Hist., 1, 

 1879, 187 ; Eeprint, 21. 



Colymbus septenirionalis, liDSJSMva, Syst. Nat., i, 1766, 220. 



Blackish ; below white, dark along the sides and on the vent and orissum ; most of 

 head and fore neck bluish-gray, the throat with a large chestnut patch; hind neck 

 sharply streaked with white on a blackish ground, bill black. Tonng have not these 

 marks on the head and neck, but a profussion of small, sharp, circular or oval white 

 spots on the back. Size of the last, or rather less. 



Habitat, Northern Hemisphere. 



Spring and fall migrant ; not rare on Lake Erie, especially in the fall, 

 rare in other portions of the State. Mr. Langdon mentions two or three 

 individuals taken in the vicinity of Cincinnati. I have never met with 

 it. 



FAMILY PODICIPID^. GREjEES, ETC. 



Feet four-toed, lobate. Hallux lobate, free. Tail ludunentary. Head with a naked 

 loral strip and bristly or variously lengthened feathers. Bill straight or decurved at 

 end, compressed, aoute. 



