( 359 ) 



the former, nor deep ochraceons like the latter, but licjht creamy buff, in decided 

 contrast to the colour of the belly. The cheeks and malar region are bright buff 

 with narrow dusky cross-lines. 



Type in Tring Museum : No. 158, ? ad., Calama, 3. vii. ]'.»07 (W. Hoffmanns 

 coll.). 



This adds another to the three forms of the H. myotheriua group of which I 

 have given a review in Nov. Zool. xiv. 1907. pp. 20-2. While the male does not 

 much differ from the same sex of H. in. melanolaema, the female may be 

 recognized at a glance from H. m. melanolaema and H. m. ochrolaema, although 

 in its characters it stands somewhat between the two. It shares the pale 

 greyish lower mandible with //. m. melanolaemi, but in the deep ochraceous colour 

 of the belly it agrees with //. m. ochrolaema, which is found on the Tapajoz as well 

 as farther down on the right bank of the Madeira near Borba. The latter form, 

 however, has the lower mandible blackish like the upper one, and the throat deep 

 ochraceous like breast and abdomen, whereas in the female of the new race the 

 throat is pale creamy buft', very much paler than, and in strong contrast to, the rest 

 of the under parts. The cheeks and malar region are brighter buff, variegated with 

 dusky in sororia, uniform deep ochraceous in ochrolaema. 



The upper parts are rather variable, being sometimes dull greenish olive as in 

 ochrolaema., sometimes warm olive-brown with a more or less distinct rufescent 

 tinge as in melanolaema. Superciliary streak and white dorsal patch as in 

 ochrolaema. Most of the specimens have a number of small, dusky olive spots on 

 the foreneck, but in two skins (Nos. 20, 932) these are scarcely indicated. 



The young females (Nos. 12, 125) are more olive, less brownish, on the upper 

 parts, the rufescent olive superciliary streak is barely indicated, there is scarcely 

 any white at the base of the dorsal feathers, the belly is much paler, the 

 throat nearly pure white, and the upper wing-coverts lack the ochraceous apical 

 bands. 



The male from Paraizo, provisionally referred to //. m. melanolaem-i, doubtless 

 belongs to the present race. 



H. m. sororia furnishes another instance of rivers separating the ranges of 

 nearly allied forms. It would be interesting to know the meeting-point of 

 H. m. sororia and //. m. ochrolaema, both of which occur on the right bank of the 

 Rio Madeira, the latter near its mouth, the former farther up the stream. 



[236. Hypocnemis myotherina ochrolaema Hellm. 



Hypocnemis myotherina ochrolaema Hellmayr, Bull. B. 0. C. xvi. p. 100 (1906. — Itaitiiba, left bank 



of the Tapajoz) ; idem, Nov. Zool. xiv. 1907. p. 379 (Borba). 

 B.. myiotherina (neo Spix) Pelzeln, I.e. p. 88 (Borba). 



Right bank, lower Rio Madeira : Borba (Hoft'raauns, Natterer). 



This form extends eastwards to the left side of the Tocantins (Arumatheua, 

 Alcobaga).* Miss Snethlage has kindly sent the two specimens for my inspection. 

 The male is practically identical with one from Borba, while the female slightly 

 differs from those obtained at Itaituba and Borba, by having the lower mandible 

 dusky with the extreme base pale yellowish (instead of uniform black). 



In all the females of H. in. ochrolaema the throat is deep ochraceous like the 

 rest of the under parts.] 



* Joiirn.f. Orn. 1908. p. 533, 



