HIBUNDINID^. — XXIX. 71 



tt Tail scarcely forked ; rump and forehead not colored like the 

 hack Pbtrochblidon, 3. 



f ft Tail somewhat forked , unhlotched ; rump and forehead 

 colored like the back. 



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



less than 6i. .... Tachycineta, 2. 



aa. Lustroiis blue-black ; ? paler and whitish below ; length 



more than 6i . Pkogne, 6. 



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

 of blue or green. 

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



wing smooth. Cotyle, 4. 



66. Outer web of first primaiy more or less saw-like, with a 

 series of minute recurved hooks ; no tarsal tuft. 



Stelgidoptbbyx, 5. 



/. HIRUNDO, Linnaeus. Swallows. 

 1. H. eryfhrogasira, Bodd. Baen 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. TACHYCINETA, Cabanis. White-Bellied Swallows. 

 1. T. bicolor, (Vieill.) Coues. White - Bellied Swal- 

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

 6i; W. 5; T. 2|. N. Am., abundant about water, 

 nesting in trees, etc.; a handsome swallow. 



3. PETROCHELIDON, Cabanis. Cliff Swallows. 

 1. P. lunifrons, (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. 



