N. GYLDENSTOLPE, HEEL-PADS IN CERTAIN BIRDS, 5 



Cyanops asiatica Lath. Especially in a female specimen, 

 collected at Koon Tan in Northern Siarn on the 23rd of 

 May 1914 they are very well-developed, indeed, as seen by 

 the figiire given above. The whole pad, which is loosely 

 united to the integument of the metatarsal joint — it seems 

 to be near the point of being shed — measiires 14 mm in 

 length and 5,5 mm on its broadest part. The tubercles, 

 which are rather few in number (14), are placed in regular, 

 longitudinal rows. The largest tubercles are placed along 

 the sides of the pad, the smallest, which are most numerous, 

 in the middle. The posterior ones viz. those placed furthest 

 down the tarsi, are more worn off than those placed more 

 arteriorly, and have a hollow cavity. The sharp points of the 

 tubercles are directed upwards on those placed posterior of 

 the middle line and directed downwards on those placed 

 higher up. 



Therciceryx liiieatus hogdsoni Bp. 



Tn this species the sharp pointed tubercles resemble those 

 found in Megalcema virens Bodd. and are equal both as to 

 their shape and number, as shown by several specimens from 

 Northern Siam obtained during my last journey. 



Fig. 5. 

 Therciceryx Hneatus hodgsoni Bp. 

 Lateral view of left tarsus. ^/i. 



Fig. 6. 



Therciceryx lineatus hodgsoni Bp. 



Left tarsus. ^/i. 



Therciceryx phaeostricta phaeostricta Bp. 



In this species though closely allied to Thericeryx line- 

 atus hodgsoni Bp. the tubercles are much more numerous. 

 They generally are about 22 in number, all of which are 



