ON THE TRACHEA OF THE GALLINZE. 489 
upper ovoid, the lower semi-ovoid, with its convexity downwards. In 
Phasianus there is no interval between the penultimate and last 
tracheal rings, nor any of importance higher up. In P. colchicus, how- 
ever, above the antepenultimate ring, there are small median intervals, 
fusiform and elongate in front, minute behind. These shortly become 
the notches of the interlocking superior rings. 
Pucrasia darwini is so like the genus Phasianus, as far as the parts 
under consideration are concerned, that it needs no separate descrip- 
tion. Any difference is in the direction of Huplocamus, the sides of 
the last tracheal ring being slightly uptilted. 
Returning to Huplocamus, a start in another direction brings us to 
Thaumalea, T. picta and T. amherstie being identical, as far as their 
windpipes are concerned. In this genus the intrathoracic rings 
(tracheal rings) are in contact all round, as far as and including the 
penultimate ring, which sends down a short median anterior process 
to articulate with a small corresponding upward-directed one from the 
upper margin of the last ring. Posteriorly, in the young bird, the 
blunted triangular extremity of the pessulus interpolates itself be- 
tween the two slightly expanded ends of this (therefore imperfect) 
ring, its extremity meeting and even disrupting the continuity of the Page 366. 
lower edge of the antepenultimate ring to a small extent. The last 
tracheal ring is characterised by the great obliquity of the plane of 
its lateral moieties, the downturned angle between which is less than 
45°, Behind there is a considerable interval between its downward- 
directed ends, filled up by the pessulus, which is prevented from 
Fig. 15. Fig. 16. 
aa 
-~ 
Front view. Back view. 
Thaumalea picta. 
