( 308 ) 
Nos. 753, 788. ? 9% ad., Allianca, 6, 15. xi. 1907.—Wing 52, 53; tail 26, 29; 
bill 9 mm. 
“Tris white or yellowish white, feet greyish yellow or pale yellow, bill blackish 
or grey, tip and lower mandible paler.” 
The majority of the adalt males have the milky white cap laterally and 
posteriorly bordered by a narrow, pale bluish line ; in these specimens the back is 
of a darker green, and the anterior portion of the white ramp is faintly shaded with 
delicate bluish. In Nos. 554, 580, 581, 139, and in the Allianca example the pale 
bluish edge of the cap is replaced by an indistinct yellowish green line, the back is 
of a clearer, less intense green, and the white ramp lacks the bluish tinge. 
The series of females proves beyond doubt that my P. gracilis was based 
on an individual variety of P. nattereri, ‘The two from Calama are quite typical, 
having the crown washed with dull bluish, and the throat as well as the foreneck 
strongly suffused with green; while those from Allianca have no bluish tinge on 
the crown, like the type of P. gracilis, with which one of them also agrees in the 
light, yellowish green colour of the throat. 
Until recently P. nattereri was only known from the Rio Madeira, where it is 
confined to the right bank (from Borba to Allianca, and probably farther up the 
river, for the type of P. gracilis was obtained on the Rio Guaporé). Miss 
Snethlage, however, has lately found it at Villa Braga, on the left bank of the 
neighbouring Rio Tapajéz.* 
136, Pipra stolzmanni Hellm. 
Pipra stolzmanni Hellmayr, Ibis (8) vi. p. 44 (1906.—Marabitanas, Rio Negro) ; idem, Nov. Zool, 
xiv. 1907. p. 360 (Paraizo, Borba). 
P, virescens (nec Pelzeln) Pelzeln, Zur Orn. Bras. ii. pp, 128, 187 (part. : Borba). 
No. 981. ¢ ad., Maruins, Rio Machados, 8. vii. 1908. “Iris dingy white, feet 
and bill black.”—Wing 51; tail 23 ; bill 10 mm. 
Stracture of the tail and coloration exactly as in the type and other specimens 
(from Bogoté, Borba, etc.). In the middle of the anterior crown there are a few 
minute, yellowish dots to be seen. 
P. stolzmanni has, as yet, only been found on the right bank of the Rio Madeira, 
but as it is also met with in Eastern Peru and Keuador, it is very likely to occur on 
the left bank as well. 
[137. Neopipo cinnamomea (Lawr.). 
Cf. Hellmayr, Nov. Zool. xiv. 1907. p. 361 (Humaytha). 
Left bank : Humaytha (Hoffmanns). Not obtained on the present occasion. ] 
[138. Xenopipo atronitens Cab. 
Xenopipo atronitens Cabanis, Arch. f. Naturg. 13. i. p, 235 (1847.— British Guiana) ; Pelzeln, Zur 
Orn. Brasil. ii. p. 129 (Borba). 
Right bank: Borba, in the forest of the Campina (Natterer). Not obtained by 
Mr. Hoffmanns. 
N.B.—I am unable to detect any differences between typical Guianan skins 
(R. Rapununi, H. Whitely coll.) and those secured by Natterer on the Madeira and 
Rio Negro.] 
; * Journ. f. Orn, 1908, p. 504. 
