40 Mr. W. P. Pycraft on the 



backward continuation of the inter-ramal tract. Near the 

 middle of the neck it forks to accommodate the U-shaped 

 neck, the branches passing, one on either side of the curve, 

 to terminate on the pt. ventralis. 



Pt. ventralis (text-figs. 4 & 5, pp. 39 & 41). — This tract in 

 its general features recalls that of the Nyctalinse. The outer 

 branch of the two rows of feathers is distinct, and runs out- 

 ward from a little below the summit of the shoulder to the 

 free edge of the patagium. The middle and inner branches 

 divide near the upper third of the furcula, at the point where 

 the inner branch is joined by the pt. colli ventralis. The 

 middle branch is quite distinct, and runs downwards as far 

 as the posterior ^ of the sternum. At a point corresponding 

 with a line drawn across the middle of the sternum this 

 branch gives off the characteristic " hook," which turns 

 abruptly upwards, forwards, and outwards on the hypopteron. 

 The area between the hook and its stem is sparsely covered 

 with semiplumous feathers. The inner, in common with the 

 middle, branch arises at the summit of the shoulder, the two 

 branches being given off at the point of contact with the 

 pt. colli ventralis : from this point backwards the inner branch 

 runs, first slightly inwards and downwards towards the carina, 

 then slightly upwards till the right and left tracts are divided 

 by nearly the whole width of the sternal plate ; from this 

 point backwards they slowly converge again to terminate in 

 a line with the pubic extremities, but some distance from 

 the cloaca (see text-fig. 4, p. 39). 



Pt.femoralis (text-fig. 5, p. 41). — This tract is ill defined 

 and small in extent. The feathers of which it is composed 

 are semiplumous in nature. The femora -crural band is, 

 however, very distinct, the crural portion terminating some 

 distance below the knee-joint. 



Pt. cruralis. — This tract is well defined and invests the 

 whole leg. It is continued downwards over the acrotarsium, 

 and, feebly, in the shape of a few bristles, to the aero- 

 podium. The planta is feathered. 



Pt. alaris (text-fig. 6, p. 42). 



Metacarpo-digitals (primaries) 10 ; 6th longest (reckoning 



