( 355 ) 
Nos. 84, 363, 364, 476. 29 imm., Calama, 21. vi., 10, 28, viii. 1907.—Wing 
59—62 ; tail 40—42; bill 15—163 mm. 
No. 764, 3 ad., Allianca, 8. xi, 1907.—Wing 59 ; tail 39; bill 154 mm, 
Nos. 952, 966, 1029. 33 ad., Maruins, 28. vi., 1, 17, .vii. 1908.—Wing 58—60; 
tail 39 ; bill 15—16 mm. 
Nos. 951, 972. 29 ad., Maruins, 28, vi., 5. vii, 1908.—Wing 59; tail 40}; 
bill 15 mm, 
“Tris grey or brown, feet pale yellow or reddish yellow, bill black.” 
The series agrees perfectly with another from Eastern Ecuador (Napo) and 
several examples from Peru. Adult males have the top of the head slate-grey, 
the markings on the Wings and the rounded spots of the interscapulium pure white 
or very nearly so, the basal portion of the tail clear ashy or but faintly tinged with 
olive, and the flanks as well as under tail-coverts very pale creamy buff. Immature 
males are mnch browner above, the pale markings on wings and back bright buff, 
and the flanks much more extensively and deeper ochraceous buff. Adult females 
differ from young ones merely by having the pileam more mixed with 
slate-grey. 
The above variation is well illustrated by the two series from the Napo and 
Rio Madeira respectively. 
As first pointed out by Ménégaux & Hellmayr,* two forms had been 
confounded under the name of theresae. In the following lines I give a 
condensed résumé of their characters, range, and synonymy :— 
(a) Hypocnemis naevia naevia (Gm.). 
Pipra naevia Gmelin, Syst. Nat. 1. ii. p. 1003 (1789.—ex D’Aubenton, PI. enl. tab. 823. fig, 2 
= fg: Cayenne); Latham, Jnd. Ornith. ii. 1790, p. 559 (based on the same); Shaw, Gen. Zool. 
X. i, 1817, p. 32 (based on the same). 
Conopophaga naevia Vieillot, Nouv. Dict. vii. 1817. p. 458 (based on the same), 
Alypocnemis naevia Pelzeln, Zur Orn. Bras. ii, 1868. p. 89 (Marabitanas, Rio Negro, Natterer coll. : 
Cayenne: ex Becceur); Berlepsch, Nov. Zool. xv. 1908, p. 159 (Ipousin, R. Approuague, 
Cherrie coll.). 
H. naevia naevia Ménégaux & Hellmayr, Bull. Soc. Philomat. Paris 1906. p. 44 (Cayenne ; crit.). 
H., theresae (nec Des Murs) P. L. Sclater, Cat. Birds Brit, Mus, xv. 1890. p. 292 (part. : specimens 
a, b, ex Oyapoc, Cayenne) ; Ménégaux, Bull, Mus. Paris x. 1904, p. 177 (Camopi, Cayenne, 
Geay coll.), 
Hab. French Guiana: Cayenne (Buffon, Becceur), Oyapoc (Verdey), Ipousin, 
Rio Appronague (Cherrie), Camopi (Geay), Saint-Jean-du-Maroni (Le Moult; Mus. 
Monac.). North Brazil: Marabitanas, upper Rio Negro (Natterer). 
3 ad. Above intense rufous brown, top of the head like the back, only the 
forehead slate-grey ; a restricted patch in the middle of the interscapular region 
black, marked with small, drop-shaped spots of pale buff. Tertials bright rafous 
brown, with a buff apical spot, preceded by a black subterminal band. Rectrices 
bright rufous brown, with a well-defined black subterminal bar, from 3 to 2 mm. 
wide, and a narrow buffy white apical margin. This measures about lto 2 mm. 
in width on the outer tail-feathers, but is scarcely indicated by a whitish fringe 
on the central pair. Sides of breast and abdomen as well as crissam bright 
ochraceons, 
Wing 57—61; tail 37—42 mm. : 
% ad. Agrees in the specific characters with the male. Under surface bright 
ochraceous ; throat rather paler, more buff, bordered on each side by a narrow black 
malar streak. 
* Bull. Soc. Philomat. Paris 1906. pp. 45-6. 
