CO Lr MB us. 5 



Genus COLYMBUS Lixn^us. (Pago 4, pi. I., figs. 2, 3.) 



Species. 



Wince 5.00 inches or more, 

 t'. Bill about as long as the head. Wing more than G.OO inches. (Subgenus 

 Colymbus.) 

 t'. Feathers of lower parts pure white to the extreme base. Nuptial 

 plumage : Throat and chin butfy white, passing posteriorly into ricii 

 ferruginous on the very prominent auricular frill, which is tipped 

 with black ; top of head and elongated tufts on each side of occiput 

 glossy black. Length 22.00-24.00; wing 6.80-7.75; eulmen 1.75- 

 2.30. Hab. Nearly cosmopolitan, but no authentic record for any 

 portion of America. 



C. cristatus Linn. Crested Grebe.' 

 c'. Feathers of lower parts white only superficial!}', the concealed portion 

 being distinctl}- grayish. Nuptial plumage : Top of head dull black, 

 somewhat glossy ; rest of head ash-gray, bordered above and poste- 

 riorly by whitish ; neck rufous. 

 d'. Length about 17.50 ; wing 6.45-7.00 (6.63) ; eulmen 1.50-1.55 (1.53). 

 Mab. Northern portions of eastern hemisphere. 



C. grisegena Bodd. Red-necked Grebe.' 

 d-. Length 18.00-20.50 ; wing 7.30-8.10 (7.65) ; eulmen 1.65-2.40 (2.02). 

 Eij(js 2-5, 2.23 X 1-37. Hab. North America, including Green- 

 land, breeding far northward ; eastern Asia. 



2. C. holboellii (Eeinh.). Holboell's Grebe. 



P. Bill much shorter than head. Wing not more than 6.00 inches. (Subgenus 



Dytes Kaup.) 



c'. Bill compressed (deeper than wide) at base. Nuptial plumage : Lower 



neck and chest rufous; sides of occiput with a very full dense 



tuft of soft, blended, ochraceous feathers. Downy young : Whole 



top of head dusky; sides of bead whitish with two stripes and 



several irregular spots of dusky ; a dusky streak on each side of 



throat ; upper parts plain dusky graj-ish. Length 12.50-15.25 ; wing 



about 5.75. Eggs 2-7, 1.78 X 1-20. Hab. Northern portion of 



northern hemisphere, breeding in America chiefly north of the 



United States 3. C, auritus Linn. Horned Grebe. 



c". Bill depressed (wider than deep) at base. Nuptial plumage: Head, neck, 

 and chest black ; sides of head, behind e}'es, with a tuft-like or 

 somewhat fan-shaped loose patch of slender ochraceous feathers. 

 Downy young : Top of head dusky, with several white markings, the 

 middle of the crown with a small naked, reddish space ; no dusky 



> Cnlymbut cri.(a(ii« LiSM., S.N. e<i. in, 1758, 135. 

 » Colymbut i/ritcijma BoDD., Tabl. P. E. 17S3, Si. 



