Total length. Culmcn. Wing. Tail. Tarsus, 



in. in. in. in. in. 



/. Imm. Panama {McLeannan) 4-5 0-3 39 2'0 0-45 



g. Juv. Veragua {Arce) 3'9 0-25 3-45 1'6 0-4 



h. Juv. „ „ 3-7 0-3 3-45 1-8 0-4 



i. $ ad. Frontino, Colombia (Salmon) . . . 4'4 03 35 1'7 0-4 



k. S imm. Roraima, 8/5/82 {Whitely) . . . 4'5 03 3.8 1*8 0-45 



/. Ad. „ 10/12/81 „ ... 4-2 0-25 3-8 1-9 (V4 



m. Ad. Ecuador (ex Gould) 4-6 0'3 3"85 1-95 0'4 



n. Ad. Sical, Ecuador {Buckley) 4'5 0'3 3"7 2-1 045 



o. Ad. Chiguinda, Ecuador {Buckley) . . . 4'4 0*3 3'8 T95 0-45 



p. Ad. Ecuador (ex Gould) 4"3 0'25 3"7 1-95 0-45 



q. S ad. Arequipa {Whitely), 6/6/67 .... 5-1 0-3 39 22 0-4 



r. S ad. Cosuipata „ 2/9/68 . ... 5-0 0"25 4*1 2-1 0'4 



s. Ad. Cangalli, Bolivia {Buckley) 4"5 03 4"1 2" 15 0"45 



t. ? ad. Chili {Philip-pi §■ Landbeck) .... 50 0'3 3-85 2'05 0"45 



u. Ad. Chili {Reed) 53 0-3 4"05 2'2 045 



v. ? . Cosquin, Cordova, Argentine Republic 



{White), 17/8/82 47 0-3 4-0 2'1 0-45 



w. Ad. Eahia {Wucherer) 44 0-3 375 2-2 0-45 



x. Ad. Brazil 4-4 0-25 3'8 2"1 0"4 



y. cJ juv. Pelotas, Rio Grande do Sul, Brazil 



{Joyner) 4-0 0-3 35 1'75 0"4 



Many specimens have some ovate spots of dark brown on the breast, as in Progne tapera, and we have 

 not been able to account for this appearance, which is perceptible in both old and young birds. 

 It is present in nearly all Chilian specimens, but is not confined to them, as we find traces of the 

 same markings in others from Arequipa, Cosnipata, Bahia, and they are present in young birds 

 from Ccachupata, Peru, Quito, and Puerto Cabello iu Venezuela. This spotting is therefore 

 apparently not a sign of age or seasonal plumage. 



Hab. From Costa Rica southwards, throughout the whole of South America to Bolivia and the Argen- 

 tine Republic. In the interior of the latter country, in Chili and Patagonia, a white-vented race 

 occurs. 



The present species is spread over the greater part of South America and ranges into 

 Central America. Messrs. Salvin and Godman record it from Costa Plica and Panama. 

 Dr. Hoffmann and M. Carmiol met with it at San Jose in the former country, and the 

 latter collector also found it at Barranca. Specimens in immature plumage are in the 

 Salvin-Godman collection, so that it probably breeds in that country, but no nests have as 

 yet been found. Mr. Rogers met with the species in the Irazu district, and M. Boucard 

 procured two specimens near Cartago ; they were on the ground in a small forest. In 

 the Salvin-Godman collection are two individuals obtained by Arce at Tucurriqui in the 

 summer of 1864 ; they are both fully adult. The same collection contains several specimens 

 from Panama, procured by the late Mr. McLeannan, as well as some from Calovevora, 



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