Pterylography of Photodilus. 43 



uniform length throughout, save only the 6th covert, which 

 is distinctly shorter than the 5th and 7th. 



The major coverts of the ventral surface are small, and 

 gradually decrease in length from without inwards. The 

 reverse is the case in Asio, to take an example. 



T. media. — On the dorsal surface of the manus this row- 

 commences at the 2nd metacarpal remex. On the ventral sur- 

 face of the manus this row of feathers terminates at the base 

 of the 4th remex, not the 6th, as in Asio. On the forearm 

 they are fairly long, and not concealed by the minor coverts. 



T. minores. — On the dorsal surface these coverts are 

 wanting on the manus. There appear to be three cubital 

 rows. On the ventral surface of the manus the first row 

 replaces the t. media after the 5th metacarpal remex. There 

 appear to be but two complete rows. Distad of the 2nd or 

 more preaxial row, the wing-surface is but sparsely clothed 

 by small semiplumous coverts belonging to this series. 



T. mar (finales. — On the dorsal surface there are two rows 

 running along the preaxial border of the manus. The 

 greater part of the surface of the patagium is clothed by 

 some four or five rows. The preaxial patagial border is 

 clothed by a closely set band of these feathers which runs 

 inwards to join the pt. humeralis. 



On the ventral surface these feathers are small and semi- 

 plumous; the postaxial row overlap the t. minores, whilst 

 the feathers of the preaxial border are very closely set and 

 directed outwards, to form, with those of the dorsal aspect, 

 a clean patagial edge. 



Parapteron. — This is made up of about 8 rows, or rather 

 bundles, of three feathers in each bundle. The distal 

 bundles pass gently into the feathering of the forearm, the 

 proximal into the pt. humeralis. 



Hypopteron. — The hypopteron is represented only by a few 

 weak semiplumous feathers, which form but a single row, 

 running along the biceps muscle and merging proximally 

 with the median branch of the pt. ventralis. 



Ala spuria. — Four strong feathers take part in the forma- 

 tion of the ala spuria. 



