HIRUNDO. 801 



(No. 35,049, % .) Total lengtli, 4.25 ; wing, 3.75 ; tail, 1.90 ; depth of fork, 

 .25; dilference of primaries, 1.80; length of bill from forehead, .35, from 

 nostril, .22, along gape .55, width of gape, .45 ; tarsus, .42 ; middle toe and 

 claw, .55, claw alone, .18 ; hind toe and claw, .33, claw alone, .15. 



The above descriptiou is taken from a type of Mr. Salvin's P. 

 litlorea. Mr. Lawi'euce's type of albilinea is almost precisely like 

 it — a little larger, and with patches of a more bluish gloss on the 

 back. 



This species is very similar to P. leucorrhoa,^ of Buenos Ayres, 

 which is, however, much larger, and lacks the concealed white of the 

 forehead and hind neck. The greenish-black collar margining the 

 jugulum in leucorrhoa is more nearly continuous below, and is in a 

 measure completed by concealed dusky edges to the feathers across 

 the breast. There is no dusky appreciable on the shafts of the 

 feathers of the under parts, and almost none on the rump, and there 

 is no distinct white at the base of the tail feathers. The outer tail 

 feather is narrowly edged with whitish. 



An albino Swallow, collected by Col. Grayson, at Mazatlan, 

 belongs, as nearly as I can ascertain, to H. albilinea. 



Both these species are distinguished from P. leucojjtera of eastern, 

 and P. meyeni of western South America, by their white loral stripe 

 or line. I add description of these two species in order to complete 

 the history of the genus. 



' Hirundo leucorrhoa. 



Hirundo leucorrhoa, Vieill. Nouv. Diet. XIV, 1817, 519, and Encycl. 

 Meth. 1823, 523, Paraguay (Azara, Apunt. II, 509).—Petrochelidon 

 hue. Cab. Mus. Hein. 1850, 48. — Cotyle hue. Bdrm. Uebers. Ill, 

 1856, 144.— Ib. La Plata Reise, 1861, 478 (Parana). 



Hirundo frontalis, Gould, Pr. Zool. Soc. 1837, 22. — Ib. Birds Beagle, 

 1841, 40 (Monte Video). 



"Hirundo hucopyga," Licht. Mus. Berol. — Cabanis, Mus. Hein. 48. 



Hirundo gouldii, Cassin, Pr. A. N. Sc. 1850, 69 Q'H. frontalis,'" Godld). 

 Hah. Paraguay and adjacent regions. Nests in hollow trees or boles in 

 ground. 



(No. 12,351.) Total length, 5.20 ; wing, 4.45 ; tail, 2.40 ; depth of fork, .20 ; 

 diflFerence of quills, 2.10? length of bill from forehead, .49, from nostril, .25, 

 along gape, .61 ; tarsus, .50 ; middle toe and claw, .70, claw alone, .20 ; hind 

 toe and claw, .46, claw alone, .21. 



