MOEPHOLOGT OF THE OWLS. 273 



EXPLANATION OF THE PLATES. 



(All the figures are original.) 



Plate 24. 



Fig. 1. Dorsal aspect of the left wing of an adult Asio accipitrinux, showing the disposition of the 

 remiges and tectrices. The latter are remarkable for the fact that on the fore-arm they are 

 arranged not in quincunx, but set in obliquely transverse rows, running from without inwards 

 as in Caprimtdgus and Rhen. — Note the position of the jilumuke (d. f.). 



d.f Down-feather. 



1st — 6th cub. rem. . . 1st — 6tli cubital remcx, or secondary. 

 1st — 5th maj. cov. . . 1st — 5tli major covert. 



P Parapteron. 



3. 2. 1 ]\Ietacarpal remiges, or 1st 3 primaries, numbered from 



the wrist outwards. 



1. 2. 3 Cubital remiges or secondaries, numbered from the 



wrist inwards. 



Plate 25. 



Fig. 1. Dorsal aspect of an adult Asio accipitrinus, showing the arrangement of the pterylae. The 



dotted areas represent the pterylte ; the relative sizes of the feathers are indicated by large and 

 small dots. 



Apt. coll. d Apterium colli dorsale. 



Apt. coll. lat „ colli laterale. 



Apt. sp „ spinale. 



E Eye. 



H Feather " horn " or " ears." 



Pt. al Pteryla alaris. 



Pt. cap ,, capitis. 



Pt. caud „ caudalis. 



Pt. coll. d ,, colli dorsalis. 



Pt. cr „ cruralis. 



Pt. f. ,, femoralis. 



Pt. hum ,, humeralis. 



Pt. sj) ,, spinalis. 



Fig. 2. Left side view of the same. The dotted parts as before. 



Apt. m Apterium niesogastrsei. 



Apt. t. 1 ,, trunci laterale. 



L. a Loreal area. 



m. f. Muscular fold. 



Op . Operculum. 



Postaur. f Postaural fold. 



Pt. coll. vent Pteryla colli ventralis. 



Pt. v „ ventralis. 



R. a Ramal area. 



Note the oblique muscular fold (m. f.) running down the neck. 



Fig. 3. Ventral aspect of the same. The dotted parts as before. 



Pt. cl Pteryla aui s. cloaci. 



