Dr. Latuam’s Effay on the Trachee or Windpipes of Birds. 105 
" circumftance, we may conclude abet other varieties may be occa- 
fionally met with. 
a Whether the female has »fuch. a comfustriataats of parts is not 
in my power to determine; but it may be obferved, that the two 
birds diffe&ted by the Academy of Sciences, as well as my own, 
were males, 
VI. ARDEA VIRGO—Demorsette Heron. Tab x. Fig. y's 
Av fuperciliis albis poftice retrorfumque criftatis. 
- Ardea’Virgo, Linn. Sy/?. Nat. i. p. 234.—Ind. Orn. 2. p. 673. 
“La Grue de Numidie, Buf. Of Vii. p. 313. pl. L5.— Pl, Enl, 24%. 
: Demoifelle or Numidian ‘Crane, Gen. Syn. v. p. 35 Edw. Pl. 134. 
Ol SY oe Mem. ‘tp. aire Tranf. \vi. p. 210. t. xi. £. 5. 
* This beautiful and elegant ens is well eniowt § in our menageries, 
andi is frequently fo tame as to mix with the poultry, though in the 
winter, feafon it requires defence from cold. In. it the ¢rachea 
enters a cavity in the, keel of the. fterrium for about three inches, 
when it returns after making a bend as in the two following {pecies, 
and paffes into the cheft. I had, many years fince, an opportunity 
of obferving 1 this circumftance in a fpecimen,of my own; but, from 
the great length. of time, the part had fo far perithed as to, render it 
impoffible to take a drawing fromit. Iam _ therefore conftrained to. 
copy the figure in the Philofophical Tranfactions, which I have 
not the leaft biel of RADE {yfligienty, a authentic. 
tk 
i ax. “ANAS cxGNUS—Wuep Secu Tab. xi Fig, 1.,2+ 
A. roftro it bade at fs cera Rava, corpore albo. 
Anas Cygnus, Linn, Syft. Nat. i. p. 194.—Ind. Orn. 2. p. 833.— 
Brif. Orn, vi. p. 292. t. 28.—Raii Syn, Av. p. 136. A. 2. 
/Vot, IV.. P ”Gygne 
wa 
