( 358 ) 
No. 562. ¢ ad., Jamarysinho, 17. ix. 1907.—Wing 70 ; tail 463 ; bill 17 mm. 
No, 849. 3 ad., Marmellos, 22. xii, 1907.—Wing 67 ; tail 45; bill 17 mm. 
Nos. 1, 816, 907. 2? ad., Calama, 8. vi. 1907; Marmellos, 16. xii. 1907; 
Marnuins, 5, vi, 1908.—Wing 65—68 ; tail 42—46 ; bill 17 mm. 
“Tris brown, feet plumbeous or bluish black, bill black.” 
Identical with examples from British Guiana, Caura Valley, etc. #H. J. 
angustirostris is widely distributed in Amazonia, from the Tocantins westward 
to the rivers Parts and Jurua, and to Teffé, Rio Solimoéns, in the north. 
[234. Hypocnemis myotherina melanolaema Scl. 
[Thamnophilus myotherinus Spix, Av. Bras. ii. p. 30. tab xlii. fig. 1 [¢ ad.] (1825.—part. : 
descr. of ¢ only, no locality ; cf. Nov. Zool. xiv. 1907. pp. 20-1).]° 
Hypocnemis melanolaema Sclater, Proc. Zool. Soc. Lond. xxii. 1854. p. 254. pl. lxxii, fig. 2 (1855.— 
“in Peruvia, Chamicurros ”), 
H. myotherina melanolaema Hellmayr, Nov. Zool. xiv. 1907. p. 379 (Humaytha). 
Left bank of the Madeira: Humaytha (Hoffmanns). Not obtained on his 
second journey. 
On the right bank of the stream it is replaced by the next form. ] 
235. Hypocnemis myotherina sororia n. subsp. 
Hypocnemis myotherina melanolaema (nec Sclater) Hellmayr, Nov. Zool, xiv. 1907. p. 379 (part. : 
No. 1311, ¢ vix ad., Paraiso). 
Nos. 13, 31, 136,160, 181, 259,400. od ad., Calama, 10, 13, 30. vi., 3, 7, 23. vii., 
15. vii, 1907. “Tris red or brownish red, feet plumbeous, bill black.”—Wing 62— 
65 ; tail 388—41; bill 153—163 mm. 
No. 159. ¢ vix ad., Calama, 3. vii. 1907. “Iris red-brown, feet grey, bill 
black.”— Wing 63 ; tail 404 ; bill 164 mm. 
No. 540. d ad., Jamarysinho, Rio Machados, 12. ix. 1907. “Iris brownish 
red, feet clear grey, bill black.”—Wing 64; tail 41; bill 15 mm. 
Nos. 169, 403. go juv., Calama, 6. vii., 16. viii, 1907. °“ Iris brown, feet grey, 
bill black.”—Wing 62, 63 ; tail 384, 41; bill 16 mm. 
Nos. 20, 28, 83, 85, 158, 258. 29 ad., Calama, 11, 21. vi., 3, 23. vii. 1907. 
“Tris brown or reddish brown, feet plumbeons, bill black, lower mandible greyish.”— 
Wing 62—64 ; tail 3741; bill 15—163 mm. 
Nos. 12, 125. $9 juv., Calama, 10, 29. vi. 1907. “ Iris brown, feet grey, bill 
black, lower mandible pale.”—Wing 61, 644 ; tail 40; bill 15, 15} mm. 
Nos. 932, 1013. ?% ad., Maruins, Rio Machados (Vargem), 18. vi., 13. vii. 
1908. “Tris brown, feet grey, bill black, below greyish."—Wing 63, 63}; tail 
404, 42; bill 15, 15} mm. 
d ad. Much like H. m. melanolaema Scl. from Northern Bolivia, Peru, and 
Humaytha, left bank of the Rio Madeira, but averaging smaller and the cinereous 
colour of the under parts somewhat richer. Pale band behind the black frontal 
edge and superciliary streak ill-defined, greyish white, exactly as in its western 
representative. 
? ad. Agrees with H. m. melanolaema Scl. in the pale lower mandible, but the 
breast and abdomen are much darker, deep ochraceous as in A. m. ochrolaema 
Hellm, It differs, however, from both in having the throat neither pure white like 
