CHAPTEE XIX. 



Genus I BID O RH YNCH US. 



CHARADKiiDJi rostro valde arcuatOj tarso omnino reticulato. 



Diagnosis 

 of genus. 



The Ibis-billed Oystercatcher is the sole representative of the genus which has almost Generic 



•11 J. 1 T 1 1 i? -i i- characters. 



unnecessarily been estabushed tor its reception. 



The diagnosis of the genus IbidorhyncJms may be slightly altered from that of 

 Hamatopus as follows : — 



Charadriid^ with a much decurved bill, and with the tarsus reticulated all round. 



It probably represents the descendants of a party of Oystercatchers which escaped 

 from the Polar Basin along none of the four coasts which lead from it, but ascended the 

 Yenesay to find refuge in MongoHa from the cold of a Glacial Period. 



It frequents the banks of mountain-streams, and is not known to have visited the 

 coast. It is said to be capable of enduring great cold. 



2s 



