THAYEK AND BANGS: VERTEBRATA OF GORGONA ISLAND. 95 



FORMICARIIDAE. 

 9. Thamnophilus gorgonae, sp. nov. 



Type. — Coll. E. A. & 0. Bangs, No. 14,005, adult ?, Gorgona Island, July 1, 

 1904. 



Twenty-four specimens, adults $ 9> June 23 to July 2, 1904. 



M. C. Z., Nos. 40,281-40,290, adults $ 9, June 2,3 to July 2, 1904. 



Cliaraders. — Nearest to T. naemiis (Gml.), but slightly larger, tail longer, 

 and bill relatively smaller. Adult <J similar in color to that of T. naevius, but 

 paler gray below, and more whitish in middle of belly — intermediate in color 

 between the males of T. naevius and T. amhiguus Swains. Adult 9 quite dif- 

 ferent in color from females of these two species, though somewhat interme- 

 diate between them. From the 9 of T. naevius it dififers in being much paler 

 and much more reddish brown ; the general color much as in T. amhiguus, ex- 

 cept that in that species the pileum and tail are strongly rufescent. 



Color. — Adult 9) upper parts reddish raw umber, slightly more rufescent on 

 crown ; wings blackish, the primaries edged with raw umber, secondaries with 

 buff and lesser coverts tipped with buff; outer scapulars edged externally with 

 whitish ; tail raw umber, all the feathers except central pair with a white ter- 

 minal spot, the central ones with a tiny buff spot in the middle of the tip, the 

 outer pair with another spot, buffy white, on the outer web midway of feather; 

 under parts pale raw sienna on throat and middle of belly and under tail coverts 

 and shading to tawny-olive on sides ; a large semi-concealed white patch on. back. 



Measurements — 



