372 On same new Genera of Raptores. [May, 



represent the sub-family of the eagles, in the aberrant group of the 

 Strigidee ; and not merely so, but precisely, Aquila and Pandion. But 

 as to the situation of Urrua and Bulaca, or as to their analogies, I am 

 quite at a loss. Taking, however, as my guide the medial size of the 

 disc and conch, I shall class them, for the present, in the sub-typical 

 group, characterised as before ; and the following generic characters 

 may, I hope, serve to make them understood, in themselves and in 

 their relations. 



Strigid^e. 



Sub-typical group. 



Genus Urrua, nob. 



Bill sub-equal to the head, somewhat elongated, scarcely arched 

 from the base, compressed, strong. Nares ovoid, transverse. Wings 

 and tail somewhat elongated : wings moderately gradated, 3rd and 

 4th quills sub-equal and longest. Tail not bowed, even. Tarsi and 

 toes plumose. Tarsi elevate, not feeble. Head egretted. Ears scarce- 

 ly valved, oval, traversed by a membranous thong. Size considerable. 

 Habits sub-diurnal. Dwells frequently in holes on steep bank-sides. 



Type, Urrua Cavearea, nob. No. 57. 



Genus Bulaca, nob. 



Bill sub- equal to the head, somewhat elongated, scarcely arched 

 from the base, compressed, strong. Nares elliptic, transverse, tumid. 

 Wings conspicuously gradated ; considerably shorter than the tail ; 

 5th and Gth quills longest and sub- equal. Tail sufficiently elongated, 

 bowed. Conch ovoid. Legs and feet, short, strong, plumose. Head 

 Bmooth. Habits nocturnal. Size considerable. 



Type, Bulaca Newarensis, nob. No. 59. 



It is quite out of the question to range Urrua with Otus, because of 

 the greatly inferior size of the disc and conch ; or with Bubo, because 

 of the length of the legs ; or with either, because the bill is decidedly, 

 though not conspicuously, elongated and straightened. Equally im- 

 possible is it to range Bulaca with Strix or with Otus ; because its disc, 

 though perfect, is not larger than in Urrua ; because its bill is (like 

 that of Urrua) stronger and shorter than that of Strix, longer and less 

 arched than that of Otus ; and because its wings have characters quite 

 opposite to those of either genus. 



Urrua has the sub-diurnal habits, the pale iris and the egrets of 

 Otus ; Bulaca, the nocturnal habits, the dark iris, and the smooth head 

 of Strix. In both the orifice of the ear is oval, but large ( 1 ,* s inch 

 long). In Bulaca it has a large distinct valve : in Urrua, scarcely any. 

 In neither is there any appearance of the long circular denuded line 



