Birds of Celebes: Podicipedidae. 
915 
vellow head, D. exulans, when adult, by its large size (wing 670 — 740 mm), 
white plumage with black remiges, and w'hitish legs and feet. The young of 
the two latter are dusky (the face of B. exulans w'hite) and require more care- 
ful discrimination from D. nigripes (cf. Water B. N. Amer. 1884, II, 346; Cat. B. 
1896, XXV, 11. cc.). 
ORDER PYGOPODES. 
This order should apparently be restricted to contain the Grebes and the 
Divers, as . the Alcae, though very like in general appearance, are shown by 
h'urbringer and Gadow to deviate in many important points of structure in 
which the two groups might have been expected to agree. 
The Pygopodes are natatorial birds, taking their food by diving, and are 
best characterized by their legs, which are situated so far back as to necessitate 
an almost upright carriage on land, where the bird rests upon the back of the 
tarsus as well as on the foot; by the very reduced tail which is hardly notice- 
able; by the small wings, rounded to tit the body; and by the straight, pointed 
bill, not serrated along the edges. The feet are either webbed (Colymbidae) 
or lobed (Podicipedidae), the outer toe is as long or more often longer than the 
middle one, the hallux, when present, is small, lobated, and not united with the 
other toes. The eggs are unspotted, and the young are able to swim immediately 
after being hatched. 
FAMILY PODICIPEDIDAE. 
GENUS PODICEPS Lath. 
The toes of the Grebes are four in number, lobated, i. e. furnished with broad 
side-flaps, the hallux small and situated on the inner side of the tarsus at a 
higher level than the anterior toes; the tarsus is much compressed and furnished 
with rugose scutellae along its hind edge upon which the bird rests; there is 
hardly any appreciable tail, what there is of it consisting of hair-like feathers; 
the wing is small, fitting the body, 1 2 primaries. The nest is a floating mass 
of decaying vegetation; the eggs are white, but soon become discoloured from 
the nest-materials, with which the bird also has the habit of concealing them 
on leaving the nest. The Grebes are almost cosmopolitan in range. 
392. PODICEPS TRICOLOR (G.R.Gray.). 
Moluccan Little Grebe. 
a Podiceps Sylbeocyclus) tricolor (1) Gray, P. Z. S. 1860, 366. 
Podiceps tricolor (Ij Wall., P. Z. S. 1863, 36, 487; (2) Salvad., Orn. Pap. 1882, ID, 
470; (3) W. Bias., J. f. 0. 1883, 140; (4) Pleske, Bull. Ac. Petersb. 1884, Xn, 
1 15 * 
