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CAPRIMULGID®. — HIRUNDINID&. 339 
Nyctibius, Humboldt. Bill small, as in Caprimulgus : 
the upper mandible with a projecting tooth. Feet 
_ broad, fiat. 
N. grandis. Vieil. 
Caprimuteus, Lin. Bill remarkably small and weak ; 
the sides inflexed, and sometimes gaping. ‘Tarsus 
short,- All the toes directed forwards; the inner and 
outer toes equal: the middle claw pectinated. 
Caprimulgus. Gape strongly bristled. Tail lengthened, 
rounded. Lateral toes equal. 
C. Europzus. Selby. i. pl. 42*. 
Psalurus, Sw. Gape strongly bristled. Tail excessive- 
ly long, and very deeply forked. Brazil. 
P. macropterus. Pl. Col. 157. bifurcatus. Sw. Sp. Nov. 
Chordeiles, Sw.. Gape perfectly smooth. Wings very 
long, equal to the tail, which is slightly forked. North 
America. 
_ C. Americanus. N. Zool. ii. Wilson, 40. f. 1, 2. 
Scortornis, Sw. General structure of Caprimulgus ; 
but the outer lateral toe is shorter than the inner. 
_Scortornis. Rictus strongly bristled. ‘Tail lengthened, 
graduated, or rognded. 
S. climacterus. West. Af. ii. Vieil. Gal. 129. 
Macrodipteryx, Sw. Rictus strongly bristled. Wings 
long, equal to the tail, and with a lengthened remi- 
form feather in each. Tail even. Africa. 
_ M. Africanus. Sw. West. Af. ii. Shaw, N. Miss. pl. 265. 
| Protthera, Sw. Rictus almost smooth. Wings very 
long, equal to the tail, which is short and even. 
Tarsus very naked. America. _ 
P. diurnis. Pl. Col. 182. 
Famiry HIRUNDINIDE. Swallows. 
Plumage compact, glossy. Bill very small and trian- 
gular. 
Cypsexus, Aristotle. Margins of the bill inflected and 
slightly gaping. Gonys ascending. Wings excessive- 
ly long, curved. Feet small, weak. Tarsus very short. 
Zz 2 
