282 REVIEW OF AMERICAN BIRDS. [PART I. 
So far as I can ascertain, this species has never received a dis- 
tinctive appellation. Specimens from Panama, apparently identical, 
have been labelled P. chalybea, by Mr. Cassin and Mr. Lawrence; 
but as explained below,‘ I cannot agree with their conclusions, or 
those of Cabanis. 
There are in the collection specimens of a closely allied, though 
larger species, from Bolivia, which I have referred to the P. do- 
mestica, named from Azara.? 
1 Progne chalybea. 
Hirundo chalybea, Gueutn, 8. N. I, 1788, 1026 ( Hirundo cayanensis, Bris- 
son, II, 495, tab. 46, fig. 1; Burr. VI, 675 ; Pl. enl.545, fig. 2, Cayenne). 
Hab. Cayenne. 
Of this species I have never seen a specimen, or one agreeing unmistakably 
with the minute account of the above mentioned authors. 
As described by Brisson (L’Hirondelle de Cayenne), it is steel black above, 
with the entire under parts grayish-brown. The lateral tail feather exceeds 
the middle by six lines. Length, 6 inches; bill, 9} lines; tarsus, 5 lines; 
middle toe and claw, 7 lines. Buffon speaks or it as lustrous violet black above, 
beneath reddish-gray, veined with brown; lighter on the lower parts of belly 
and crissum. Length, 6 inches; bill, 94 lines; tarsus, 5 or 6 lines, ete. The 
size is thus much as in Brisson’s bird; the lower parts reddish-gray, varied 
with brown, paler behind, instead of grayish-brown. Neither author refers 
to any white whatever on under parts. In size the species agrees better with 
P. leucogaster than any other true Progne, and it is barely possible the two 
may be the same, but I cannot reconcile the apparent differences. It would, 
at any rate, be strictly in accordance with the usual law of distribution of 
South American birds to find the Cayenne species specifically different from 
the Central American. 
2 Progne domestica. 
Hirundo domestica, Vir1uu. Nouv. Dict. XIV, 1817, 521 (Golondrina do- 
mestica, D’AzaRaA, Apunt. II, 1805, 502, no. 300, Paraguay).—VIEILL, 
Encycl. Méth. II, 1823, 527.—?Progne domestica, Gray, Genera.— 
In. Catal. Fiss. Br. Mus. 1848, 28 (Bolivia).—Casanis, Mus. Hein. 
I, 1850-1, 51 (Rio Grande do Sul).—BurmeistEer, Ueb. III, 142.— 
Is. Reise La Plata, II, 1861, 477 (La Plata). 
Hab. Paraguay and Bolivia. 
(No. 16,834, young male, Bolivia.) Above steel blue, much as in P. subis. 
Beneath, from chin to breast, and on sides, smoky brown. Rest of under 
parts white, the shafts mostly dusky. Feathers tipped with steel blue, form- 
ing as a kind of collar across the jugulum and along the sides of body; no 
trace of them on the chin, throat, and abdominal region, not even in the pin 
feathers. 
A second specimen, also probably young male, is still lighter on the throat 
and breast, almost white on the latter, although clouded with brown, and with 
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