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20. Pachysylvia muscicapina griseifrons Snethl. 
(Hylophilus muscicapinus Sclater & Salvin, Nomencl. Av. Neotrop. p. 156 (1873, —Cayenne). | 
Pachysylvia muscicapina griseifrons Snethlage, Orn. Monber. xv. p. 160 (1907.— Villa Braga, left bank 
of the R. Tapajéz) ; eadem, Journ. f. Ornith. 1908. p. 497. 
Nos. 897, 915. dd ad., Maruins, Rio Machados, 2, 8. vi. 1908. “Iris greyish 
brown or brown, feet plumbeous, bill black, lower mandible grey.”—Wing 59, 604 ; 
tail 45, 454; bill 13,14 mm. (Munich Museum.) 
P. m. griseifrons appears to be a fairly well-marked form. Compared with the 
series from Cayenne and the Caura Valley in the Munich Museum, the two skins 
differ by having the back decidedly brighter yellowish green and the sides of the 
head conspicuously deeper isabelline-rufous. The chin as well as the upper throat 
are scarcely different from the colour of the lower throat and foreneck, while they 
are more or less whitish in the typical race. Furthermore, the dull rufescent 
frontal band, more or less well pronounced in P. m. muscicapina, is absent, the 
forehead being cinereous like the crown and nape, and the lower tail-coverts are of 
a deeper olive-yellow. There is no difference as regards size between the two 
forms, whose ranges are as follows :— 
(a) P. muscicapina muscicapina (Sel, & Salv.). 
Cayenne: Oyapoc (Jelski). Surinam (d in Tring Museum, Chunkoo coll.). 
British Guiana: Corentyn River (Im Thurn), Bartica Grove, Camacusa (H. Whitely, 
jun., coll.). East Venezuela: Suapuré, La Union, La Pricion in the Caura Valley 
(E. André coll.). : 
(b) P. muscicapina griseifrons Snethl. 
North Brazil: Villa Braga, left bank of the Tapajéz (Snethlage, type) ; 
Maruins on the Machados, right-hand tributary of the Rio Madeira (Hoffmanns). 
21. Vireo chivi (Vieill.). 
Sylvia chivi Vieillot, Nouv. Dict, xi, p. 174 (1817.—ex Azara : Paraguay). 
Vireosylvia agilis Pelzeln, /.c. p. 73 (Borba). 
No. 533. 2 juv., Jamarysinho, 10, ix. 1907. ‘Iris dark brown, feet grey-blue, 
bill grey.” 
Adult birds obtained by Natterer at Borba agree well with others from 
Paraguay, Brazil, ete. Cf. my remarks in Nov. Zool. xiii. 1906, p. 11. 
[22. Vireo calidris calidris (Linn.). 
Motacilla Calidris Linnaeus, Syst. Nat. x. p. 184 (1758.—based on Edwards, Nat. Hist. Birds iii. 
p. 121. pl. 121. fig. inf. [pessima !] ; Jamaica), 
Vireosylvia mystacalis Pelzeln, l.c. p. 73 (Borba). 
Natterer shot an adult male (in moult) near Borba, February 10, 1830. 
Thanks to Dr. Lorenz, this bird is now before me, and proves to be an example 
of V.c. calidris. The superciliary line is bright isabelle as in a long suite from 
Jamaica, Porto Rico, and Haiti, while it is much paler, dull white or buffy 
whitish in V. ¢. barbatula (from Cuba and Bahama Islands) and V. ec. barbadensis 
(from Santa Lucia, Guadeloupe, 8. Vincent, etc.) ; cheeks and malar region are 
tinged with pale isabelline, which is not the case in the last-named races; the 
pilenm is dull brownish, the tips of the feathers edged with greenish (in V. ec. 
