HIEUNDINID^E. XXIX. 71 



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



back PETROCHELIDON, 3. 



fff Tail somewhat forked , unblotched ; rump and forehead 



colored like the back. 

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



less than 6i TACHYCINETA, 2. 



aa. Lustrous blue-black ; ? paler and w r hitish below ; length 



more than 6i. . PROGNE, 6. 



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



of blue or green. 

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



wing smooth. COTYLE, 4. 



&&. 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. 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. 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. 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 cliffs, but now under 

 the eaves of barns, etc. 



