H2 Dr. Latham'* Effay on the Trachea or Windpipes of Birds, 



Pfeifente, Befch, der Berl. Nat. Fr.lv. p. 601. t. 18. f. 5. 

 Wigeon, Whewer, Whim, Gen. Syn. vi. p. 518. — Br. Z00L ii. 

 No. 286.— Will. Orn. p. 375. t. 72, 



The total length is 20 inches. The trachea at firft fight does 

 not feem materially to differ from that of the Pintail, yet on a more 

 narrow infpecfion will be found not to accord with it. In the firft 

 place the bony orb is fmaller, not being larger than the end of the fin- 

 ger — both indeed feem globular, but that of the Wigeon is moil per- 

 fectly fo. They both differ like wife in point of attachment. In the 

 Pintail it is united to the fide of the arch on a line above the centre, 

 in the Wigeon fomewhat below it, and the bottom of both the orb 

 and arch are nearly even, but in the Pintail the bottom of the arch is 

 higher of the two — befides which, the bony arch itfelf is a little dif- 

 ferent in fhape, as may be feen by comparing the two figures. The 

 oppofite parts of both put on an appearance not greatly different 

 from thofe of the Gadwal, which makes it unneceffary to give a 

 figure of them in that fituation. 



From the above comparifon, it is prefumed that no one will here- 

 after confound the laft three birds together. 



XVII. ANAS BOSCHAS— The Mallard. Tab. xiii. Fig. 10. 



A. recTricibus intermediis (maris) recurvatis, roftro recto. 



Anas Bofchas, Linn. Syft. Nat. i. p. 204. — Ind. Orn. ii. p. 850. — 



Rait Syn. Av. p. 145. A. 1. 150. 1. 

 Canard fauvage, Buf. OiJ. ix. p. 1 15. t. 7. 8. — PL EnL 776. 777. 

 Die zahme und die wilde Ente, Befcb. der Berl. Nat. Fr. iv. p. 601. 



t. 18. f. 5. 

 Mallard and Wild Duck, Gen. Syn. vi. p. 489.— £r. Zool. ii. No. 279. 



t. 97. — Will. Orn. p. 308. t. 72. 75. 



This 



