260 DR. J. J. KAUP’S MONOGRAPH OF THE STRIGID#. 
Here is a rich field to cultivate, destined for some happy savant having rich collections 
at his command. 
In conclusion, I beg to express my best acknowledgements to Dr. Gray and Mr. G. R. 
Gray for their kindness and liberality ; it is to these gentlemen, and the information 
derived from the British Museum, that I owe what serves for the foundation and what 
is of most value in this Monograph. 
But the aid of these gentlemen would have been unavailing to carry this Monograph 
to a conclusion without the pecuniary assistance of Mr. Edward Wilson, of Hén Castle 
in South Wales, formerly of Philadelphia, whose liberality enabled me to visit the 
Museum at Paris, and there make the necessary additions by personal inspection of 
all the species which it contains. I also give my best thanks to Professor I. Geoffroy, 
Dr. Pucheran, and M. Kiener of Paris for their kindness and liberality. 
EXPLANATION OF THE PLATES. 
PLATE LVI. 
Figs. 1, 2. Skull of Glaucidium ferrugineum. 
Fig. 3. Bill of Athene, showing the position of the nostrils. 
Fig. 4. Ear-orifices of Athene, showing their asymmetry. 
Fig. 5. a. Bill of Surnia passerina; 6. wing of the same, showing the emarginations. 
Fig. 6. a. Bill of Surnia ulula; b. end of wing of the same. 
Fig. 7. a. Bill of Ieraglaux connivens ; b. end of wing, showing emarginations. 
Fig. 8. a. Right ear of Otus brachyotus, b. left ear, showing their asymmetry. 
PLATE LVII. 
Figs. 1, 2. Skull of Otus vulgaris. 
Figs. 3, 4. Skull of Otus brachyotus. 
Fig. 5. Wing-end of Bubo africanus, showing emarginations. 
Fig. 6. Wing-end of Bubo ketupa, showing emarginations. 
Fig. 7. Skull of Bubo ketupa. 
Fig. 8. Head of Strix flammea, showing ear-orifice (a, a). 
Fig. 9. Skull of Syrnium aluco. | 
Fig. 10. Ear-orifices of Syrniwm aluco: a. right side ; 5b. left. 
