ACC1PITEES 473 



number, but fourteen occur in Neophron percnopterus and 

 Rhinogryphus 'calif ornianus. 



There are powder-down patches in Eton us, Circus, and 

 Gypaetus. The ptcryloxis is described for a variety of types 

 by NITZSCH. 



The ventral tract broadens out on the breast, where 

 it is even sometimes (Gyps fulvus) divided into an outer 

 and inner branch. The dorsal tract forks upon the 

 shoulders ; in Gi/paetus barbatus each limb of the fork is 

 connected by a single row of feathers with the long single 

 median posterior portion of the tract. 



In Periiis apivorus these latter slender forks are figured as 

 being much longer, and in Falco peregrinus they dilate into 

 four or five rows of feathers before uniting. In Falco 

 brachypterus there is the usual dorsal fork, but between its 

 extremities lies the beginning of the very broad posterior 

 part of the tract. In all these birds there are lateral neck 

 spaces. The lumbar tract is but little marked, or is entirely 

 deficient. A large amount of detail is given in NITZSCH'S 

 account of this family, which is treated more fully than many 

 others. 



The tensor patag ii brevis is simple in all accipitrines, and 

 there is never a biceps slip. There is, however, a certain 

 amount of variation in the tendon. The simplest form of 

 the tendon is seen in 



Vultur monachus 

 auricnlaris 



Falco melanogenys 

 subbuteo 



Gyps fulvus ,, cesalon 



Tinnunculus alaudarius Thrasaetus harpyia 



Microhierax ccerulescens 



where it is a simple tendon without branches, as in many 

 picarian birds. On the other hand in 



Buteo vulgaris tipilornis bacha 



Circus nut it r us 

 ,, Gouldi 

 Helotarsus ecaudatus 



,, cheela 

 Neophron percnopterus 



Nil Dago chima-ck i ma 



