( 371 ) 



No. 1353. <S ad., Borba, 17. xi. 06. "Iris yellowish red, feet plumbeous, 

 bill black."— Wing 65 ; tail 54 ; bill 17 mm. 



This series fully bears out the distinctness of D. s. heterogynus Hellm. 

 (cf. supra, p. 61). The males are constantly paler schistaceons below than that 

 from Teffe, while the females differ at a glance by having the under parts buffy 

 brownish or buffy yellow instead of bright ochraceous. The back, too, is of a 

 lighter, less rnfescent brown. 



80. Dysithamnus niurinus (Scl. & Salv.). 

 Cf. supra, p. 37. 



No. 1045. (<?) juv., Humaytha, 3. viii. 06. " Iris greyish brown, feet 

 plumbeous, bill black." 



81. Dysithamnus ardesiacus saturninus (Pelz.). 



[Dysithamnus ardesiacus Sclater & Salvia, P. Z.S. 1867. p. 756 (based on D. schistaceus Sclater (nee 



D'Orbigny), P. Z. S. 1858. pp. 66, 222-Rio Napo, East Ecuador).] 

 Thamnophilus saturninus Pelzeln, Zur Ornith. BrasU. ii. p. 147 (1868. — Cayenne ; Borba and Serra 



CaraumAn ; — Borba accepted as typical locality, cf. Hellm., Verliandl. zoo!, hot. Gesellsch. Wien, 



1903. p. 216). 



No. 1416. S ad. in moult, Borba, 29. xi. 06. "Iris brown, feet plumbeous, 

 bill black."— Wing 80 ; tail 60 ; bill 18 mm. 



With but a few specimens from Borba before me, I caunot say with certainty 

 if the birds from the Rio Branco, Cayenne, British Guiana and the Caura River 

 are really quite identical with D. a. saturninus. Adult males of the various 

 localities present little difference in coloration except that those from Borba have 

 more white at the base of the interscapular feathers, and are decidedly darker 

 schistaceous on the belly. The latter are, however, larger, with a much longer 

 tail and rather stronger bill. Should additional specimens from the Rio Madeira 

 confirm these characters, the northern birds were to be separated as a smaller, 

 paler race. 



Wing. Tail. 



Two c?c? ad., Borba (including the type of 



D. a. saturninus') 80, 75 60, 58 mm. 



Two ? ? ad., Borba 



Seven adult and immature S S from the Caura River 

 Two ? ? from the Caura River .... 

 Two 3 S ad., British Guiana ..... 



Two ? ? „ „ „ 



Four <J S ad., Cayenne 



Two ? ? „ „ 



One S ad., Serra Carautmin, Rio Branco . 



82. Thamnomanes caesius persimilis Hellm. 



Tli a nam manes caesius persimilis Helluiayr, Nov. Zool. xiv. p. 64 (1907 — Teffc). 

 T. caesius (nee Temminck), Pelzeln, Zur Ornith. Brasil. ii. 1868. p. 80 (Salto do Girao) ; Ihering, 

 Eevist. Mus. Paul. vi. 11)05. p. 440 (Rio Jurua). 



Nos. 1053, 1US4. Si ad., Humaytha, 6, 14. viii. 06. "Iris dark brown, 

 feet aud bill black."— Wing 71, 74 ; tail 63, 64 ; bill 17, 171 mm. 



