234 MK. W. p. PYCEAFT ON THE 



Apteria : — 



Ajjferinm cajnih.— The apteria of the liead are represented by the bare spaces 

 surrouudiug the eyelids, the spaces on the operculum, and the space on the outer side of 

 the feathers forming the " ear "-tufts (PL 25). 



JpL colli laterale (PI. 25. fig. 2). — Extends from the base of the neck, as a continua- 

 tion of the apt. trntici lat., forwards to the base of the head, where it branches into au 

 upper limb, running to the postaural fold, but terminating some distance from its free 

 edge (PI. 25. tig. 3), and a lower, which serves to separate the ramal from the inter- 

 ramal areas of the pt. capitis. 



Apt. trunci laterale (PI. 25. fig. 2). — Arising at the shoulder, it serves to divide the 

 humeral fi-om the spinal tract, and is continued baclovards to the tail, and thus separates 

 the spinal from the femoral tracts. At the free edge of the axillary fold it runs down- 

 Arards to embrace the whole side of the bodv. Its extreme ventral limit is bounded bv 

 the inner border of the pt. ventralis. 



Apt. spinale (PL 25. fig. 1). — This is the space enclosed by the brandling arms of the 

 upper and lower portions of the pt. spinalis. 



Apt. mesogastrcei (PL 25. fig. 3). — The dimensions of this space can be seen at a 

 glance in the figure. 



Apt. crurale. — This is the space at the l)ack of the leg (p. 231), and is continued 

 downwards on the tarso- metatarsus. 



Aft. alee superioris. — The space dividing the humeral from the wing-tract. 



Apt. al(B infei'ioris. — Embraces the bare region of the arm and patagium. 



Asio OTUS, Linn. 



Pt. capitis : — 



Fronto-parietal are a. — The feathers forming the " ear "-tufts are distinct from 

 the general j)lumage of the head, and consist of a longitudinal row of some 7-8 feathers, 

 bounded on either side by an apterion. 



Loreal are a. — Sharply defined; upper limb free,more slender than in A. accipitrinus. 



I n t e r r a m a 1 are a. — The anterior symphysial portion shorter antero-posteriorly 

 than in A. accipitrimiH ; the posterior portion joining the feathers of the ramal area on 

 (.'ither side. 



Pt. colli dorsalis. — The lateral neck-folds gradually tapering backwards, and not 

 suddenly expanded just behind the head. With a retractor muscle. 



Pt. spinalis. — Interscapular fork commencing at the confluence of the j^t- colli dorsalis 

 and p>t. spinalis. The free ends of the intersaipular fork are received into the arms of 

 the lumbar fork, which are continued outwards on the posterior patagial membrane as in 

 A. accipitrinus. The tract l)ifurcates posteriorly, embracing, but not surrounding, the 

 oil-gland. 



Pt. colli veniralis.—Yerj broad at the point of bifurcation. 



Pt.fehioralis. — Femoro-crural band terminating at the base of the patella. 



Pt. ventralis. — Inner branch somewhat nearer the middle line than in A. accipitrinus. 



