HmUNDINID^. — XXIX. 71 



ff Tail scarcely forked; rump and forehead uot colored like the 

 back Petkochelidon, 3. 



f f f Tail somewhat forked , imblotched ; rum]) and forehead 

 colored like the back. 



a. Lustrous green or violaceous; pure white below; length 

 less than 6^ Tachycineta, 2. 



rtfi. Lustrous blue-black; ? paler and whitish below; length 

 more than 6i . Pkugne, 6. 



** Plumage brownish-gray ; scarcely lustrous and without shades 

 of blue or green. 



b. A little tuft of feathers on tarsus at base of hind toe; edge of 

 wing smooth. ...... Riparia, 4. 



hi). Outer web of first primary more or less saw like, with a 

 series of miaute recurved hooks, no tarsal tutt. 



Stelgidofteryx, 5. 



/. CH ELI DON, Forster. Swallows. 



1. C. erythrogastra, Bodd. Barn Swallow. Lustrous 

 steel-blue, pale chestnut below ; forehead and throat 

 deep chestnut; an imperfect steel-blue collar; tail very 

 deeply forked; L. 7; W. 5; T. 4^. N. Am., abundant; 

 breeding in colonies about barns, etc. 



2. TACHYCINETAfCahamii. White-Bellied Swallows. 



1. r. 6/co/or, (Vieill.) Coues. White -Bellied Swal- 

 low. Lustrous green, pure white below; ? duller; L. 

 6j; W. 5; T. 2f. N. Am., abundant about water, 

 nesting in trees, etc.; a handsome swallow. 



3. PETROCHELIDON, Cabanis. Cliff Swallows. 



1. P. /unifrons, (Say ) Cab. Cliff Swallow. Eave 

 Swallow. Lustrous steel blue; forehead, sides of head, 

 throat, rump, etc., of various shades of chestnut; a blue 

 spot on breast, belly whitish; L. 5^; W. 4^; T. 2^. N. 

 Am., abundant, formerly nesting in cliffs, but now under 

 the eaves of barns, etc. 



