VO l L 889. n '] PROCEEDINGS OF THE NATIONAL MUSEUM. 27 



(skill), 5.60; wing, 3.10; tail, 2.35; exposed ciilmen (bill broken); tar- 

 sus, .85 ; middle toe, .72. 



A specimen said to be from Bahia, in the collection of the American 

 Museum of Natural History (Lawrence collection), agrees exactly in 

 all essential features with the Panama and Guatemala specimens men- 

 tioned above. It measures as follows: Length (skin), 6.35; wing, 3.40; 

 tail. 2.70; exposed culmen, .85; tarsus, .88; middle toe, .75. 



-I have been unable to refer to the "Birds of Brazil" in order to ascer- 

 tain whether the Sclerurus ruficollis of Swaiuson is the same as this spe- 

 cies ; but a specimen in the Lafrasnaye collection (No. 2323 ter.), kindly 

 lent to me by the authorities of the Boston Society of Natural History, 

 labeled " Sclerurus rujicollis Swains., Brazil," is so much like examples 

 of 8. mexicanus that I can not distinguish it satisfactorily. The only 

 differences that I am able to find consist in the shorter bill (the exposed 

 culmen measuring only .82 against .90-1.00 in Central American speci- 

 mens), and rather lighter color of the pileum and hind-neck; but these 

 differences are so slight that I am not inclined to regard them as of any 

 importance or as representing more than a moderate extent of individ- 

 ual variation. 



Sclerurus caudacutus (Vieill.). 



Thamnophilm caudacutus Vieill., Nouv. Diet., in, 1816, 310 (Guiana) ; Enc. Me"th., 



1823, 742. 

 fMyiothera caudacula Lafu., Mag. de Zool.,1833, pi. 10.— Gray, Gen. B., I, 1846, 



210. 

 Sclerurus caudacutus Bonap., Consp., i, 1850, 210.— Scl. & Salv., P. Z. S., 1867, 



573 (Capiin R., Lower Amazon); Norn. Neotr.,1873, 62 (part). — Salvix, Ibis, 



1885, 419 (Br. Guiana). 

 f Sclerurus caudacutus, var., Pelz., Orn. Bras., n Arb., 1869, 86* (Maribatanas). 



Sp. Char. — Plain vaudyke-brown, rather lighter beneath, where be- 

 coming russet on chest and tawny or ochraceous on throat; rump and 

 upper tail-coverts more ruddy brown or burnt-umber; tail dusky brown. 



Hab. — Guiana and Lower Amazons. 



Adult (specimen in Lawreuce collection, Am. Mus. Nat. Hist., from 

 Cayenne). — Above uniform clear vandyke-brown, becoming chestnut- 

 brown or burnt-umber on rump and upper tail-coverts ; tail dusky 

 brown, lighter basally ; sides of head and neck, chest, and lower throat 

 russet-brown, the under surface of the body, including uuder tail-cov- 

 erts, similar in color to back, but paler, more of a mummy-brown hue. 

 (Upper throat and chin apparently tawny or ochraceous, but the feathers 

 of these parts wanting.) Bill brownish black, the basal half of the 

 lower mandible brownish whitish ; legs and feet brown. Length (skin), 



* "A female and a male (from Maribatanas, April, 1831) are very similar to Scleru- 

 rus caudacutus, though somewhat smaller (but not so small, however, as those of 

 No. 909 [_S. rufigularis']) ; the tail is shorter, lower back brown like upper back, only 

 the upper tail-coverts somewhat reddish-brown (S. caudacutus has the lower back and 

 upper tail-coverts dark rust-colored), and the upper breast hardly a trace of ochre." 

 (Pelz., I. c; translation.) 



