150 



SCANSORES. 



in the Straits of Corca. It appears to be most nearly related to 

 Picas feddeni from the Burma peninsula, and to Picus kalinuwskii 

 from the Corean peninsula. 



Picus ridiardsi. 



Tliese three Woodpeckers and half a dozen others form a eompaet 

 little subgenus, to which the name of Thrijwnax has been applied. 

 They agree with all the species of the genus Picus in the position 

 of the nasal grooves, and of the angle of the mandible, as well as in 

 the length of the tail ; but they differ from Dn/ocopus and typical 

 Picus in the com|)arative length of their toes. In tyjjical Picus the 

 reversed toe is the longest ; in Dryocopus the reversed toe is equal 

 in length to the middle tcje ; whilst in Thripunax (as in the genus 

 Gecinus) the reversed toe is shorter tlian the middle toe. Somewhat 

 the same relation of the subgenera of Picus to each other and to 

 Gecinus is also observable in the distance between the nasal grooves. 



