338 ON THE CLASSIFICATION OF BIRDS. 
tail covers enormously developed, and hiding the tail. 
South America. ‘The rasorial type. 3 
C. resplendens. Gould, Mon. pavoninus. Spix, i. Pl. 35. G 
Crypticus, Sw.* General structure of Prionites ; but 
the bill excessively broad, flattened, and dilated at 
the base. Culmen arched, grooved in the middle ; 
the cutting margins minutely and regularly serrated. — 
C. platyrynchus. Ill. of Orn. iii. pl. 106. 
Prionires, Lliger. Both mandibles slightly curved 
and compressed ; the margins with strong denticula- 
tions. Tongue long, slender; _ the sides ciliated. 
Wings short, rounded. Tail lengthened, cuneated. 
Feet gressorial, as in Merops. 
P. Braziliensis. Il. Pl. E.370. Mexicanus. Zool. Ill. ii. 
Bahamensis. Part 5. No. Martii. Spix,i. pl. 50. 
154. Dombeyii. Le Vaill. pl. 39. 
ruficapillus. Lliger. 
Famiry CAPRIMULGIDA. WNightjars. 
Plumage lax, soft. Bill exceedingly small: gape enor- 
mous. Feet very short, weak: the hallux directed 
forwards.t 
Popareus, Cuv. Size large. The middle claw not 
serrated. The hallux not directed forward. | 
Podargus proper. Bill large, very strong: the tip 
and margins of the upper mandible folding over 
those of the lower. Culmen elevated and arched. — 
True rictal bristles none. Tongue very thin, entire. 
Tarsus short. Australia. | 
P. humeralis. Lin. Tr. xv. 198. 
Aigotheles, Horsf. Vig. Bill weaker, depressed. Tarsus” 
lengthened, Middle and outer toes nearly equal ; in-— 
ner much shorter. Australia. * 
fi. Australis. Sw. White’ s Voy. a 29, 
* It is by this form, as I suspect, uniting to Lampr tite: that the circles > 
of the Halcyonide and the Trogonide arc connected. : 
t Until this family, and the next, are better understood, both in regard to ' 
the species, and the subordinate forms, I have thought it best not to attempt 
their natural arrangement. 
