SWALLOW. 317 



less so in the country : many people set up poles on their premises, 

 and tie empty gourds to them for the birds to make the nest in ; the 

 eggs white, somewhat transparent at the larger end. 



Appear about New York in April, and extend to Hudson's Bay, 

 at both much esteemed : in the latter called Sashaun-pashu. 



51.— CHALYBEATE SWALLOW. 



Hirundo chalybea, Ind. Orn. ii. 578. Gm. Lin. i. 1026. 



Cayanensis, Bris. ii. 495. t. 46. 1. Id. 8vo. i. 296. 



Hirondelle de Cayenne, Buf. vi. 675. PL enh 545. 2. 

 ■ — domestique, Voy. d'Azara, iv. No. 300. 



Chalybeate Swallow, Gen. Syn.'w. 574. Shaw's Zool. x. p. 96. 



LENGTH six inches. Bill three quarters of an inch, somewhat 

 stout, and brown ; plumage above black, with a polished steel gloss ; 

 under parts of the body grey brown ; quills and tail black, without 

 gloss, the last moderately forked ; legs brown : in some birds the 

 under parts are greyish, approaching to white ; the wings reach 

 about an inch beyond the end of the tail. 



Inhabits Cayenne, seen there throughout the year ; observed fre- 

 quently perched on fallen trees, or burnt-up leafless ones ; said to lay 

 the eggs in the hollows of trees, and to make no nest. This and the 

 last seem to be nearly allied, if not one and the same species. — 

 Sonnini, by his quotations, blends them together. 



52— SEVERN SWALLOW. 



Hirundo nigricans subtus alba, &c. Ind. Om. ii. 574. 



— — — bicolor, Vieill. Am. i. p. 61. pi. 31. 



Severn River Swallow, Phil. Trans, lxii. 401. 16. Gen. Syn. iv. p. 565 3. A ? Arct. 



Zool. ii. No. 331.— parag. 2d. Shaw's Zool. x. 105. 106. 

 Green-blue, or White-bellied Swallow, Amer. Orn. v. p. 44. pi. 3S. f. 3. 



LENGTH five inches and a half. Bill and irides black ; 

 plumage above glossy black, inclining to green and blue, in 



