278 Field Museum of Natural History — Zoology, Vol. IX. 



Adult: Very similar to the preceding species in winter plumage 

 (quite different in summer), but the peculiar shape of the bill will 

 distinguish it. The upper mandible is much flattened at the nostril 

 (the width at this point being greater than the depth), and nearly- 

 straight from nostril to tip (not decurved as in C. auritits); under 

 mandible straight for about three-fourths of its length and then 

 sharply ascending. Size nearly the same as C. auritus. 



A western species, which is claimed to occur occasionally in 

 Illinois and Wisconsin during the fall and winter. It resembles the 

 Horned Grebe in winter plumage, but the shape of the bill will dis- 

 tinguish it. " Not uncommon in winter upon Lake Michigan." (Nel- 

 son, Birds N. E. Illinois, 1876, p. 151.) 



A. W. Butler states it has twice been taken in Indiana, and W. W. 

 Cooke records it from St. Louis, Mo. Messrs. Kumlj-cn and Hollister 

 say, "Very rare in Wisconsin. We have received two spring speci- 

 mens from near Iron River, Bayfield County, but have never person- 

 ally come upon or taken one in Wisconsin. Mr. H. A. Winkenwerder, 

 of Watertown, Wis., has sent us a wing of this species, which is said 

 to have come from a bird shot at that place." (Birds of Wisconsin, 

 1903, p. 6.) 



Great care should be taken in identifying this species. Several 

 specimens sent to me for examination, which were supposed to be the 

 Eared Grebe, proved to be the Horned Grebe, C. auritus, . which it 

 closely resembles in winter plumage. 



Genus PODILYMBUS Lesson. 



5. Podilymbus podiceps (Linn.). 

 Pied-billed Grebe. 



Distr.: North America in general, from British Provinces south 

 to South America (Chili), including the West Indies and Bermuda'; 

 breeds nearly throughout its range. ' 



Adult in summer: Throat, black; a blark band on the bill; no tufts 

 on the sides of the head in any plumage; upper plumage, brownish 

 black; front and sides of the neck and sides of the body tinged with 

 brown; rest of under parts, silvery white. 



Adult in winter: Throat, grayish white; no black band on the bill; 

 sides of body, faintly washed with pale brown. 



Length, variable, but about 13.50; wing, 4.50 to 5.10; bill, .75; 

 depth of bill at nostril, about .40. 



The Pied-billed Grebe is a common summer resident in both Illi- 

 nois and Wisconsin, breeding in suitable localities throughout both 



