1917.] Chapman, Distribution of Bird-life in Colombia. 231 



(483) Tigrisoma salmoni Set. & Salv. 



Tigrisoma salmoni ScL. & Salv., P. Z..S., 1875, p. 38 (lower Cauoa Valley, Col.); 

 Allen, Bull. A. M. N. H., XIII, 1900, p. 125 (Valparaiso). 



I provisionally refer to this species a young female in broadly barred 

 black and rusty plumage from Salento, because of the shortness of its 

 bill which measures only 69 mm. as compared with 108 mm. in a female in 

 similar plumage from Santa Marta, which I take to be lineatum. The 

 Santa Marta specimen has the upperparts more broadly barred with rusty 

 of a deeper shade, and the longer under wing-coverts are fuscous distinctly 

 barred and tipped with white, while in the Salento specimen they are fus- 

 cous; the bars are broken or appear as a spot, and the white tip is more in 

 the nature of a rounded, terminal band. I do not know that these varia- 

 tions in color have any significance, nor am I aware that the differences, if 

 any, between lineatum and salmoni at this age have been pointed out. 



A male from Juntas de Tamana is dark olive-green narrowly barred 

 with rusty above, a plumage which seems to follow that of the young bird 

 just mentioned, and which is apparently the one referred to in the British 

 Museum Catalogue (XXXI, p. 198). The bill measures 88 mm., the longer 

 under wing-coverts are fuscous, unbarred, and narrowly margined with 

 white. 



The bill in salmoni (of which we have three essentially adult specimens) 

 is not only shorter than in lineatum but is proportionately heavier and less 

 pointed, while the mandible is sharply bicolor, the basal half being (in skins) 

 largely yellowish horn (except along the tomium), the terminal half blackish, 

 except along the gonys on which the color of the base extends. This char- 

 acter is well shown by the second specimen in intermediate plumage, men- 

 tioned above, but not by the black and buff barred young. 



Salento, 1 (black and buff, young plumage, but with ovaries somewhat 

 enlarged); Juntas de Tamana, 1. 



(485) Ixobrychus erythromelas ( Vieill.). 



Ardea erythromelas Vieill., Nouv. Diet. d'Hist. Nat., XIV, 1817, p. 422 (Para- 

 guay River). 



Sio Frio, 1. 



(485a) Ixobrychus exilis bogotensis Chapm. 



Ixobrychus exilis bogotensis Chapm., Bull. A. M. N. H., XXXIII, 1914, p. 171 

 (Savanna at Bogotd). 



