1895.] liOunjs platopaxiiatus ajtd psittaous ebithacus. 367 



The lateral margins of the triangle of the beak, thus viewed, 

 are very slightly convex in both species. 



But a great difference exists with respect to the nares. These 

 are relatively larger, occupy a much larger portion of the dorsum 

 of the prosopium, and are much more closely approximated than in 

 P. erithacus. The distance from the cranio-facial articulation to a 

 line joining the most preaxial parts of the margins of the nares is 

 quite half the antero-posterior extent of the prosopium thus 

 viewed, instead of less than half ; while the internasal lamella, 

 instead of about equalling the diameter of each nostril from within 

 outwards, is less than a third of it. 



Fig. 3. 



1^ 



Dorsal aspect of skull of Lorius flavopalliatiis. 

 I. Lachrymal, constituting the po. Postorbital process, 



preorbital prominence. 



A large foramen exists in the middle of the dorsal lamella, 

 separating each of the nares from the cranio-facial articulation, and 

 just behind the outer part of the hinder margin of each nostril. 

 These foramina I do not find in P. erithamts. 



In the latter species, in the relatively broad lamella separating 

 the two nares, there is a depressed area in the form of two 

 grooves which run backwards — from a point in the middle of 

 a line joining transversely the antero-posterior middle points 

 of the dorsal margin of the nares — to the postaxial dorsal margin 

 of the prosopium. Prom between these two lateral grooves, 

 another groove runs forwards along the middle of the dorsum of 

 the beak, nearly to an imaginary line which would connect the 

 anterior margins of the two depressed areas in front of the two nares 

 or further forwards. The groove then bifurcates, its two branches 

 diverging at an angle of about 12°, and running forwards towards 

 the ventral margin of the beak, but stopping short of it by a 

 distance about equal to the diameter of each nostril, and each 

 ending in a foramen which leads into the substance of the bone, 



