BIRDS. ANSERES. 40. Colymbus, 355 
Inhabits within the Tropics; 2 feet 10 inches long; flies very 
high ; feeds on fiih ; is feldom feen on land except in breed- 
ing-time. 
Bill red, the margin ferrate backwards, 2) yellowifli ; eyc~ 
iron's black ; greater (luilPfeaihers black, edged with white ; 
tail-feathers 14, white, 2 middle ones 15 inches longer than 
the reft, a fourth part black ; legs yellowifh, 
‘‘‘hTf, black and white, beneath white ; bill black ; 
quill-feathers tipt with white, tail-feathers with black; 
Black-billedTr, 
Inhabits Palmejlcn and Turtle iflands; 19I inches long. 
Before and behind the eyes a black ftreak ; front white. 
flA • 
^°Iy-fie{h-colour ; bill and 2 middle tail-feathers red. 
Red-tailed Tr. 
Inhabits Mauritius Ifltlnd : 2 feet 10 inches long, of which 
the 2 middle tail-feathers meafure 1 foot 9 inches ; builds in 
hollows in the ground under trees, and lays 2 yellowifti- 
white eggs with rufous fpots. 
Arch over the eyes black, broken ; ends of the fcapularsJAzck. 
at the tips ; jldnks dufky ; legs, fhafts and bale of the 2 mid- 
dle tailfeathers black. 
40. COLYMBUS. Bill toothlefs, fubulate* 
flraight, pointed : toothed ; nofi- 
trils linear, at the bafe of the bill ; legs 
fettered. 
The birds of this family w^lk on land with difficulty, but 
fwim and dive with great dexterity : the Guillerkots chiefly 
inhabit the fca^ have a flender tongue, the ftze of the bill ; 
the bill compreffed, and covered with fhbrt feathers at the 
bale, the upper mandible a little bent ; flefh tough, and a^ 
' Well as the eggs naufeous : the Divers frequ^t alio the nor- 
fhern lakes, have a ftrong bill, lets pointed, cylindrical, tlte 
tdge of the mandible turned in, the upper longer ; noftrils 
divided in the middle by a membrane ; tongue long, iharp, 
ferrate at the bale each fide ; legs flender, a black band bc- 
Vol. I, — z ?, tweert 
