ON THE TRACHEA OF THE GALLINZE: 481 
sharp inturned angular process at the spot where it articulates with 
the anterior extremity of the second semiring. Posteriorly its articular 
upward-directed process is more deyeloped—so much so that the con- 
tour line of the posterior extremity of the last tracheal is continuous 
with that of the ring under consideration and the next as well. The 
second bronchial semiring differs but little from those which follow it, 
except in that it articulates with the one above. Its extremities are 
somewhat more expanded, and articulate freely with the angles of the 
first ring. Anteriorly it sends inwards a pointed angular process, 
which advances further towards the middle line than does the similar 
angle of the semiring above, with which it closely articulates. The 
semirings which follow have also pointed anterior ends, running Page 358. 
inwards almost as much as does the second, in a manner very cha- 
racteristic of all the genera in which the seeond semiring is pointed and 
prolonged. There is no trace of any interval between the penultimate 
and last tracheal rings. Between the last and the first bronchial 
semiring the interval is a capacious ovoid. That between the first and 
second bronchial semirings is elongate and shallow, not deeper than 
the lower bronchial intervals. Caccabis sawatilis agrees with OC. rufa, 
except that in the former there is a slight development of antero- 
lateral interannular intervals between the lower tracheal rings, as in 
Argus, the account of which follows. 
In Argus giganteus the lowermost tracheal rings are separated by 
Fig. 5. Fig. 6. 
Front view. Back view. 
Argus giganteus. 
narrow intervals in front, where in the middle line the last three fuse 
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