Pterylography of the Tiiiamiformes. 9 



2. Rhynchotus rufesckns. 



An adult moulting specimen of this Tinamou dififers in 

 pterylosis from Calodromas elegans in the foUowiug 

 points : — 



Pt. spinalis. — The cervical portion is not branched, but 

 runs in the form of a narrow band down the middle line of 

 the neck. There is a narrow apterion running along the 

 centre of the dorsal moiety of the tract, from between the 

 shoulders to a point corresponding to the anterior end of the 

 ilium, i. e. to about the middle of the back. 



Pt. caud(S. — The rectrices are hardly, if at all, differ- 

 entiated from the coverts. 



Pt. vent rails. — Of the pectoral portion the outer branch 

 is narrower and the inner somewhat feebly developed. 



Pt. humeralis. — Runs forward and downward to join 

 pt. ventralis, instead of this tract (ventralis) giving off a 

 branch to it. 



Pt. alaris. — The carpal remex (see p. 5) only is present, 

 and reduced in size, though still pennaceous. 



The Hyporhachis (aftershaft) of thetectrices majores, 

 mediae, and minores of the ventral surface rudimentary, 

 instead of well developed, as in Calodromas elegans. The 

 aftershaft of the remainder of the plumage is large. 



Apteria : — 



Apt. colli lateralis. — Extends far up the neck and is 

 very wide. 



Apt. spinalis. — A narrow space extending from between 

 the shoulders to the middle of the back. 



Filoplumes. — A few small ones round the base of the 

 remiges. 



Eyelas hes. — Stronger. 



Rhamphotheca. — Fused; no groove on the mandible. 



Powder-du wn. — Absent. 



Plumulce (down-feathers). — Absent, even on the major 

 coverts and remiges (see p. 7). 



Claws. — Absent on the wing. 



