454 ZOOLOGICAL EESULTS OF THE EUWENZOEI EXPEDITION. 



APPENDIX. 



On some Points in the Anatomy of Biadypterus cinnamomeus. 

 By W. P. Pyckaft, F.Z.S., M.B.O.U., &c. 



I. Iktkodlctory. 



The following short notes on the pterylosis and certain muscles of the wing and leg 

 in Bradypterus cinnamomeus were made on a single specimen, preserved in spirits, 

 taken on Western Ruwenzori at an altitude of 7000 feet. This specimen is now in 

 the British Museum (Natural History) {vide antea, p. 355). 



II. Ptekylography. 



Since the pterylosis of this bird presents no very striking peculiarities, it will not be 

 necessary to describe each tract minutely ; only those features, in short, which seem to 

 be peculiar to this genus, and possibly some allied forms, will be described in detail. 



Pteryla capitis (text-fig. 14 a, pt.cap.). — This tract is very thickly feathered, the 

 continuation of the apjterion colli lateralis, which in Phylloscopus, for example, extends 

 forwards to embrace the whole side of the head as far as the eye — save for a circle of 

 feathers surrounding the aperture of the ear, — is here only traceable with difficulty, 

 and is interspersed with tiny semiplumes, as also is the apterion colli laterale through- 

 out its length. 



Pt. spinalis (text-fig. 14 a, pt.sp.). — The most striking feature of this tract is the 

 broad fan-shaped saddle which is formed over the middle of the back, terminating 

 immediately over the pre-acetabular ilium. 



Pt. caudalis (text-fig. 14 a, pt.c). — There are 10 rectrices, which have rather stiff 

 shafts and loose, almost discontinuous vanes. 



Pt. colli ventralis (text-fig. 14 b, pt.col.v.). — This tract, from the middle of the neck 

 fi>rwards to its junction with the pt. capitis at the throat, is reduced to a double row 

 of small weak feathers. Rather below the middle of the neck it bifurcates, forming- 

 two broad well-defined bands, which, passing backwards, merge with the pt. ventralis. 



Pt. ventralis (text-&g. lib, pt. vent.). — This tract is rather broad; at the level of 

 the knee, however, it suddenly narrows and is continued backwards on either side 

 of the abdomen, finally converging to meet in front of the cloacal aperture. 



Pt. fem,oralis (text-fig. \4a, pt.fem.). — Though narrow, this tract is sharply defined 

 and extends in a transverse direction from the middle of the thigh backwards to the 

 base of the rectrices. 



