114 HIRUNDINIDH, SWALLOWS.—GEN. 46, 47, 48, 49. 
46. Genus PETROCHELIDON Cabanis. 
Cliff Swallow. Eave Swallow. Lustrous steel-blue ; forehead whitish (or 
brown), rump rufous, chin, throat and sides of head chestnut; a steel-blue 
spot on the throat ; breast, sides and generally a cervical collar rusty-gray, 
whitening on the belly. Young sufficiently similar. 5; wing 43; tail 24, 
nearly square. North America, in all suitable places. Naturally. this 
species builds on cliffs; but throughout the settled portions of the country 
it now places its curious bottle-shaped nests of mud under the eaves of 
barns and outhouses. Nurr.i,603 ; Aup.,i, 177, pl.47; Bp., 309. LUNIFRONS. 
47. Genus COTYLE Boie. 
Bank Swallow. Sand Martin. Lustreless gray, with a pectoral band of 
the same; other under parts white. A curious little tuft of feathers at the 
bottom of the tarsus. Sexes exactly alike; young similar, the feathers 
often skirted with rusty or whitish. 44-43; wing 33-4; tail 2, simply 
emarginate. North America, very abundant; breeds in immense troops in 
holes excavated in banks of soft earth. Wrts., v, 46, pl. 88; Nurr., i, 
607; Aup., i, 187, pl. 50; Bp., 313. a RIPARIA. 
48. Genus STELGIDOPTERYX Baird. 
Rough-winged Swallow. Lustreless brownish-gray, paler below, whiten- 
ing on the belly. Rather larger than the last; no feathery tuft on tarsus ; 
outer web of outer primary, in the ¢, converted into a series of recurved 
hooklets, which are wanting, or much weaker, in the 9. United States; 
rare or wanting in New England. Aup., i, 193, pl. 51; Bp., 373; Cougs, 
Proc’ Philas-Acads, 1866, 30. 6) = > ea Le 2 US RRIPENaIEe 
49. Genus PROGNE Boie. 
Purple Martin. Lustrous blue-black ; no purple anywhere. The 9 and 
young are much duller above, and more or less white below, streaked with 
gray. Bill very stout for this family, curved at the end; nostrils circular, 
opening upward, not roofed over. Length 7 or more; wing nearly 6; tail 
34, simply forked. United States, very abundant. Wus., v, 58, pl. 39, 
f..2,.3; Nurr., 1, 598; Aup., 1, 170; pl: 45; Bp. 314... PuRPUREA. 
Oxs. Other species or varieties of Progne, requiring confirmation, are attributed 
to North America. See Cass., Ill., 246 (California); Bp., 923, and Rev., 277 
(Florida). 
Family AMPELIDZ. 
This appears to be an arbitrary and unnatural association of a few genera that 
agree in some particulars, but are widely different in others. The composition and 
position of the group differ with almost every writer; some place it in Clamatores, 
next to the Tyrannide. I think that the family should be dismembered ; Baird has 
already shown how near the Myiadestince are to the true Thrushes, and doubtless 
the other two subfamilies here presented may be properly dissociated. 
