6 Mr. W. V. Pycraft un the 



end of the neck, over the region of the 2nd and 3rd vertebrae, 

 and is continued downwards to a point corresponding with 

 a line drawn across the back from the acetabulum. It is 

 very narrow, and is interrupted between the shoulders by 

 the fusion of tlie two branches of the pt. spinalis. 



A2Jt. colli lateralis (PI. I., Apt.c.lat.)'. — Arising rather 

 below the middle of the neck, it almost immediately passes 

 into the space dividing the humeral from the spinal tract 

 ( = the dorsal moiety of the apt. trunci lateralis, see 

 below). 



Apt. mesogastr(si (PI. I., Apt.m.). — Arising from the 

 middle of the neck, it extends in the median line unin- 

 terruptedly (?) to the pt. caudte*. 



Apt. trunci latet^alis (PL I., PI. II., Apt.t.lat.). — A 

 large space embracing the whole side of the trunk, but 

 divided, more or less completely, into two portions. The first 

 of these two segments may be said to arise at the summit of 

 the shoulder, and extends backwards to the anterior margin 

 of the femoral tract; here it turns sharply forward, and 

 serves to divide the humeral from the spinal tracts; it finally 

 terminates in tlie apt. colli lateralis. The second moiety 

 arises between the two branches of the pt. ventralis; running 

 backwards between the leg and trunk, it sweeps round the 

 femoral tract and serves to divide it from the pt. spinalis. 

 The first of these two spaces, as will be noticed (PL II.), 

 is more or less completely subdivided by a double row of 

 feathers from the outer branch of the pt. ventralis to the 

 hypopteronf. 



Aptei'ia of wing: — 



Apt. al(B superioris. — Divides the wing-feathers from 

 those of the trunk, but a narrow band of feathers from the 

 t, marginales, along the anterior margin of the patagium, 

 connects the wing-tract with the humeral tract in front, 



* Owing to dissection, this region is mucli distiu-bed. 



t Owing to the fact that the figure is a trifle out of drawing in the 

 region below the wing, the extent of this great space is somewhat obscured 

 in Plate I. 



