. XXIX. 71 



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

 back ........ PETROCHELIDON, 3. 



fft Tail somewhat forked , unblotched ; rump and forehead 



colored like the back. 



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

 less than 61 ...... TACHYCINETA, 2. 



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

 more than 6. . . . . . PBOGNE, 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. 



6&. Outer web of first primary more or less saw like, with a 

 series of minute recurved hooks; no tarsal tuft. 



STELGIDOPTERYX, 5. 



/. HIRUNDO, Linnaeus. SWALLOWS. 

 1. H. horreorum, Barton. BAKN 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. 

 6; W. 5; T. 2f. 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 clift s, but now under 

 the eaves of barns, etc. 



