606 
Mr. F. E. Beddard on some Points in 
the bronchial syrinx of the Centropine Cuckoos in the genus 
Rhamphococcyx. This genus has not, so far as I am aware, 
been examined anatomically. Through the great kindness 
of Dr. Charles Hose, of Borneo, I have come into possession 
of two individuals belonging to as many species of this 
genus. The two species are R. erythrognathus and JR. 
microrhynchus. The latter example is a hen, the former 
a cock. This genus, as might have been expected, has 
the complete Garrodian leg-muscle formula, as have the other 
Phcenicophainse. The pterylosis is constructed upon the 
same plan, and in details is similar to that of its other 
allies. The ventral tract divides into two halves at the 
Eig.18. 
End of trachea and broncbi of Rhamphococcyx 
e^-ythrognathu8 ; ventral aspect. ' 
beginning of the neck^ and leaves at first but a narrow space 
between the two. Each half, again, in the Centropine and 
Phcenicophaine manner, divides into two tracts. The exact 
point at which this division takes place is not easy to mark ; 
the process of divergence of the outer row of feathers 
from the inner being so gradual. But, in any case, it is 
after a single row of strong feathers has been given off to 
the wing. After the separation of the two divisions of the 
ventral tract of each side, the stronger inner rows are con- 
