( 323 ) 

 178. Sclerums caudacutus umbretta (Licht.). 



[Thamnophilus cauilacntiis Vieillot, Nom\ Did. iii. p. 310 (1816. — "se trouve k la Guyane ").] 

 Mi/iolhera iimbirlln Lichtenstein, Vers. Diibl. Berliner .!//(«. p. 43 (1823. — Bihia). 

 Scleriiriix ramlarutiis uinliretln, Hellmayr, Nnv. Zonl. xiv. 11)07. p. 66 (crit.). 



S. caudacutus (errore !) Pelzeln, Ziir Urn. Bras. ii. 1868. p. 86 (paft. : Borba) ; Snethlage, Joiira. 

 /. Ora, 1908. p. 507 (Villa Braga, Tapajuz). 



No. 78. S itnm., Calaraa, 26. x. 1907.— Wing 93 ; tail 70 ; bill 21 i mm. 



Nos. 195, 284, 728. ? ? ad., Calama, 9, 28. vii., 25. x. 1907.— Wiag 88—91 ; 

 tail 64—68 ; bill 21—22 mm. 



No. 992. ? ad., Marniiis, 10. vii. 190S.— Wing 88 ; tail 62 ; bill 2(U mm. 



" Iris 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 vi'hole, the series 

 agrees very well with a number of skins from the Tapajoz (Villa Braga ; coll. 

 Snethlage) and Paril ; 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. Cf. my review of Sclerums caudacutus and its allies I.e. The 

 range of S. c. umbretta is as follows : — 



Eastern Brazil : Rio Espiritu Santo (Garbe coll. in Mus. Paulist. — vidi), Bahia 

 (coll. Berlin, American and British Mus.) ; Prata, near Para (Robert). Central 

 Brazil : Villa Braga, on the Rio Tapajuz (Snethlage) ; Borba (Hoffmanns), Calama 

 (Hoffmanns), Rio Bladeira ; Marains, Rio Machados (Hoffmanns). 



[179. Sclerurus rufigularis Pelz. 



Sderurus riifiquhiria Pelzeln, Ztir Orn. Bras. ii. pp. 87, 161 (1868. — Borba, Rio Madeira ; Mara- 

 bitaaas, od 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 Pari district and in the Guianas. 



Cf Hellmayr, Nov. Zool. xiii. 1906. pp. 364-5.] 



[180. Sittasomus sylviellus atnazonus Lafr. 



[Dendrocolaptes sylviellus Temminck, Rec. PI. col. livr. 12. pi. 72. iig. 1 (1821. — " Br^sil").] 

 Sittasomus amazoniis Lafresuaye, Rev. Mag. Zool. (2) ii. p. 590 (1850. — "ad summum Amazonum'') ; 

 Pelzeln, Zur Orn. Bras. i. p. 42 (Borbi aad Salto Theotonio : Rio Madeira). 



Rio Madeira : Borba, Salto do Theotonio (Natterer). 



The Borba specimens agree with a series from Teff(5, Venezuela (Canra), and 

 British Guiana : head, nape, and lower surface being mouse-grey, witliout any olive 

 tinge ; the npper back rufescent brown, rather darker than in 5. s. chapddensi.^. 

 An adnlt female from Salto Theotonio, farther up the river, is paler throughont, 

 and forms the transition to chapadensis. The latter form inhabits Western Matto- 

 grosso (Chapada, Pari near Cayaba, Uruciim, Engenho do Gama, on the Rio 

 Gnapor^, not far from Villa Bella de Mattogrosso), the adjoining parts of Bolivia 

 (Chic^uitos), the northern states of Argentine, and Northern Paraguay. In Goyaz 

 it intergrades with 5. s. syhiellus (cf. Hellmayr, Nov. Zool. xv. 1908. p. 93).] 



