294 REVIEW OF AMERICAN BIRDS. [ PART it 
Tarsi slightly feathered on inner face at upper end; equal in 
length to middle toe without claw. 
Tail very deeply forked  . 2 : . . Hirundo. 
Tail slightly forked or emarginate . 4 4 . Tachycineta. 
Tarsi entirely naked; lengthened, equal to middle toe and 
half its claw. 
Tail considerably forked . ‘ 5 ‘ y . Callichelidon. 
Hrrunpo, Linn. 
Nostrils lateral. Tarsi short, not exceeding middle toe without its claw; 
the upper joint covered with feathers, which extend a short distance along 
the inner face of tarsus. Tail very deeply forked; the lateral feather much 
attenuated, twice as long as the middle, Basal joint of middle toe free for 
terminal fourth on outside, for half on inside. 2 
In type, and in American species, forehead and throat rufous; a black 
pectoral collar; tail feathers with large light spots on inner webs. 
But two species, perhaps only one of this subgenus, as restricted, 
belong to America. There are, however, quite a number found in 
the old world. 
Hirundo horreorum. 
Hirundo horreorum, Barton, Fragments N. H. Penna. 1799, 17.—Barrp, 
Birds N. Am. 1858, 308.—A. & E. Newron, Ibis, 1859, 66 (Sta. 
Cruz; transient).—Sciater & Saxvin, Ibis, 1859, 13 (Guatemala). 
—Scrater, P. Z. 5. 1864, 173 (City of Mex.).—LaAwrence, Aun. 
N. Y. Lye. 1861, 316 (Panama).—Coorer & Sucxtey, P. R. R. Rep. 
XII, u, 184 (south of Columbia River). 
Hirundo rufa, Vieinu.—Cassin, Ill.—Brewer. N. Am. Ool. I, 1857, 91, 
pl. v, fig. 63-67 (eggs).—Cas. Jour. IV, 1856, 3 (Cuba; spring 
and autumn).—Reinnarpt, Ibis, 1861, 5 (Greenland ; two speci- 
mens).—Gunptacu, Cab. Jour. 1861, 328 (Cuba; common). 
Hirundo americana, Witson, Am. Orn. pl. 38, fig. 1, 2.—Rico.—LemBEyE, 
Aves de Cuba, 1850, 44, lam. vii, fig. 2. 
Hirundo rustica, Avp. Orn. Biog. II, pl. 173.—Is. Birds Am. I,pl. 48.— 
Jones, Nat. Hist. Bermuda, 34 (Bermudas; Aug. and Sept.). 
Hab. Whole of United States; north to Fort Rae, Slave Lake; Greenland ; 
south in winter to Central America and West Indies. Not found at Cape St. 
Lucas. 
The steel blue of the upper parts of this species has a decided 
violet tinge, sometimes purplish. The black or steel blue pectoral 
collar is very rarely continuous below in adults; when it is, it is 
usually formed in the centre by only one or two series of feathers, 
which are black to the down. ‘The rufous of throat is a little darker — 
