4 Mr. W. P. Pycraft on the 



The nostrils are covered by a membranous operculum 

 having the form of a triangle. So far this operculum appears 

 to be unique. 



Pt. colli dorsalis (text-fig. 2, pt.coll.d., p. 5). — This tract is 

 very narrow and passes down into the 



PL spinalis (text-fig. 2, pt.sp., p. 5).— The only feature of 

 interest about this tract is the broad, more or less shield- 

 shaped expansion which occurs over the pre-iliac (lumbar) 

 region. This contracts again in the space bounded by the 

 antitrochanters of the pelvis, and passes down from this point 

 to the uropygium as a very narrow band. 



Text-fig. 1. 



if ^/J 



Head of Zeledonia coronata, shewing the form of the pteryla capitis 

 and the apterion extending from the base of the lower jaw upwards. 

 f7y>/.f7//(. = apterion capitis ; apt.coll.lat.= apterion colli laterale ; 

 pt.eap.= pteryla capitis. 



Pt. caudalis (text-fig. 2, pt.c, p. 5). — There are 10 

 rectrices. Tbe shafts of these feathers are continued beyond 

 the vanes to form minute filiform processes. The length of 

 the whole tail is about equal to the combined length of 

 the tarso-metatarsus and outer toe — minus its claw. The 

 filiform extensions of the shafts of the tail-feathers are also 

 distinctly traceable in Grandala coelicolor. 



Pt. colli ventralis. — Contracting at the throat to run down 

 the middle line of the neck, this tract divides high up, 

 sending backwards two relatively broad bands to pass at 

 the base of the neck into the 



Pt. ventralis. — This, at its origin, and for some way down, 



