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178. Sclerurus caudacutus umbretta (Licht.). 
[Thamnophilus caudacutus Vieillot, Nouv. Dict. iii. p, 310 (1816.—“ se trouve & la Guyane ”).] 
Myiothera umbretta Lichtenstein, Verz. Dubl. Berliner Mus. p. 43 (1823.—Bahia). 
Sclerurus caudacutus umbretta Hellmayr, Nov. Zool. xiv. 1907. p. 56 (crit.). 
S. caudacutus (errore !) Pelzeln, Zur Orn. Bras: ii. 1868. p- 86 (part.; Borba); Snethlage, Journ. 
Ff. Orn. 1908. p. 507 (Villa Braga, Tapajéz), 
No. 78. ¢ imm., Calama, 26. x. 1907.—Wing 93; tail 70; bill 213 mm. 
Nos. 195, 284, 728. 22 ad., Calama, 9, 28. vii., 25. x. 1907.—Wing 88—91 ; 
tail 64—68 ; bill 21—22 mm. : 
No. 992. ¢ ad., Maruins, 10, vii. 1908.—Wing 88; tail 62; bill 204 mm. 
‘Tris brown, feet blackish brown or black, bill black, below grey.” 
Some of these specimens have the foreneck and sides of the head conspicuously 
tinged with tawny, while this is less apparent in others. As a whole, the series 
agrees very well with a number of skins from the Tapajéz (Villa Braga; coll. 
Snethlage) and Para; but 1 must confess that, in view of the variability of the 
Lower Amazonian birds, I have strong doubts as regards the distinctness of 
S. c. brunneus. Of. my review of Selerurus caudacutus and its allies lc. The 
range of S. c. umbretta is as follows :— 
Kastern Brazil: Rio Espiritu Santo (Garbe coll. in Mas. Paulist.—vidi), Bahia 
(coll. Berlin, American and British Mus.); Prata, near Para (Robert). Central 
Brazil: Villa Braga, on the Rio Tapajéz (Snethlage); Borba (Hoffmanns), Calama 
(Hoffmanns), Rio Madeira; Maruins, Rio Machados (Hoffmanns). 
[179. Sclerurus rufigularis Pelz. 
Sclerurus rufigularis Pelzeln, Zur Orn. Bras. ii. pp. 87, 161 (1868—Borba, Rio Madeira; Mara- 
bitanas, on the upper Rio Negro), 
Right bank: Borba (Natterer). 
This species is allied to S. mexicanus Scl., but has a much shorter and weaker 
bill, the throat of a decidedly brighter and clearer rufous, etc. It also occurs in 
the Pard district and in the Guianas. 
Cf. Hellmayr, Nov. Zool. xiii. 1906. pp. 364-5.] 
[180. Sittasomus sylviellus amazonus Lafr. 
[ Dendrocolaptes sylviellus Temminck, Rec. Pl. col. livr, 12. pl. 72. fig. 1 (1821.—“ Brésil”).] 
Sittasomus amazonus Lafresnaye, Rev. Mag. Zool. (2) ii. p. 590 (1850.—“ ad summum Amazonum”) ; 
Pelzeln, Zur Orn, Bras. i. p. 42 (Borba and Salto Theotonio: Rio Madeira), 
Rio Madeira: Borba, Salto do Theotonio (Natterer). 
The Borba specimens agree with a series from Teffé, Venezuela (Caura), and 
British Guiana: head, nape, and lower surface being mouse-grey, without any olive 
tinge; the upper back rufescent brown, rather darker than in S. s. chapadensis. 
An adult female from Salto Theotonio, farther up the river, is paler throughout, 
and forms the transition to chapadensis. The latter form inhabits Western Matto- 
grosso (Chapada, Pari near Cuyabdi, Urucim, Engenho do Gama, on the Rio 
Guaporé, not far from Villa Bella de Mattogrosso), the adjoining parts of Bolivia 
(Chiqnitos), the northern states of Argentine, and Northern Paraguay. In Goyaz 
it intergrades with S. s, sylviellus (cf. Hellmayr, Nov. Zool. xv, 1908. p. 63).] 
