286 BIRDS—HIRUNDINID A. 
KEY TO THE GENERA OF HIRUNDINIDA. 
* Plumage above more or less lustrous blue-black or gieen; no tarsal tuft nor re- 
curved hooks on outer primary. 
t Tail deeply forked; outer feathers attenuate and blotched with white. 
HIRUNDO. 
tt Tail scarcely forked; rump and forehead not colored like back. 
PiTROCHELIDON. 
ttt Tail somewhat forked, unblotched ; rump and forehead colored like back. 
a Lustrous green or violaceous; pure white below ; length less than 64. 
TACHYCINETA. 
aa Lustrous blue-black; female paler and whitish below; length more than 64. 
PROGNE. 
* * 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. 
{+ Outer web of first primary more or less saw-like, with a series of minute re- 
curved hocks; no tarsal tuft. STELGIDOPTERYX. 
GENUS HIRUNDO. Linneus. 
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 the 
tarsus. Tail very deeply forked; the lateral feather much attenuated, twice as long as 
the middle. Basal joint of middle toe free for terminal fourtb on outside, for half on 
inside, 
HIRUNDO ERYTHROGASTRA Boddeert. 
warn Swallow. 
Hirundo rufa, KIRTLAND, Ohio Geolog. Surv., 1838, 162.—REaD, Proc. Philad. Acad. Nat. 
Sci., vi, 1853, 395.—KIRKPATRICK, Ohio Farmer, vili, 1859, 227. 
Hirundo horreorum, WHEATON, Ohio Agric. Rep. for 1860, 364; Reprint, 1861, 6; Food 
of Birds, Ohio Agric. Rep. for 1574, 564; Reprint, 1875, 4—LAaNGpDON, Cat. Birds of 
Cin S770 
Hirundo erythrogaster var. horreorum, LANGDON, Revised List, Journ. Cin. Soc. Nat. Hist., 
i, 1879, 173; Reprint, 7. 
Hirundo erythrogaster, BopDzRT, Tab. Pl. El., 1783, 45, 
Hirundo rufa, GMELIN, Syst. Nat., 11788, 1018. 
HMoirundo horreornm, Barton, ‘‘ Frag N. H. Penna., 1799, 17.” 
Hirundo erythrogaster var. horreorum, COUES, Birds of N. W., 1874, 85. 
Hirundo erythrogastra, COUES, Birds of Col. Val., 1878, 407. 
Lustrous steel-blue; below, rufous or pale chestnut of varying shade; forehead, chin 
and throat deep chestnut; breast with an imperfect steel-blue collar. Tail with white 
spots on the inner web of all the feathers except the inner pair. Sexes alike, young less 
lustrous, much paler below, tail simply forked. Wing 44-42; tail 24 to 5. 
Habitat, America. 
Very abundant summer resident. Breeds. Arrives about the end of 
the first or during the second week of April, and remains until Septem- 
ber ist. 
