( 268 ) 

 2ft. Pachysylvia muscicapina griseifrons Saethl. 



[fJi/lophi!us mwscicapinua Sclater & Salvia, Noinencl. Av. Neotrnp. p. 156 (1873. — Cayenne).] 

 Pachyxijlria miixriicnpina griseifinns?,aeih\a,ge, Oin. Mniibfr. XT. p. 160(1907. — Villa Braga, left bank 

 of the R. Tapajoz) ; eadem, Joiirn.f. dniilh. I'.HIS. p. 497. 



Nos. 897, 915. SS ad., Maruins, Rio Machados, ',', 8. vi. 1908. " Iri.-; greyi,sh 

 brown or brown, feet plumbeous, bill black, lower mandible gre}'." — Wing 59, 60A ; 

 tail 45, 45§ ; bill 13, 14 mm. (Munich Museum.) 



P. m. griseil'rons appears to be a fairly well-marked form, fompared with the 

 series from Cayenne and the Canra Valley iu the Munich Museum, the two skins 

 dift'er 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. //>. muscicapina, is absent, the 

 forehead being cinereous like the crown and nape, and tlie lower tail-coverts are of 

 a deeper olive-yellow. There is no diflferenoe as regards size between the two 

 forms, whose ranges are as follows : — 



{a) P. muscicapina muscicapina (Scl. & Salv.). 



Cayenne ; Oyapoc (Jelski). Surinam (r? ¥ in Tring Museum, Chunkoo coll.). 

 Britisli Guiana: Corentyn River (Im Thurn), Bartica Grove, Camacusa (H. Whitely, 

 jun., coll.). East Venezuela : Suapure, La Union, La Priciou in the Caura Valley 

 (E. Andr^ coll.). 



yb) P. muscicapina i/risci/ro»s Snethl. 



North Brazil : Villa Braga, left bank of the TapajiV, (Snethlage, t//pe) ; 

 Maruins on the Machados, right-hand tributary of the Rio Madeira (Hoffmanns). 



21. Vireo chivi (Vieill.). 



Sylcia chivi Vieillot, Xoui: Did. xi. p. 174 (1817.— ex Azara : Paraguay). 

 Vireosylvia agilis Pelzeln, I.e. p. 73 (Borba). 



No. 533. ? juv., Jamarysinho, 10. i.\. 1907. " Iris dark brown, feet grey-blue, 

 bill grey." 



Adult birds obtained by Natterer at Borba agree well with others from 

 Paraguay, Brazil, etc. Cf my remarks in ]Voi\ Zool. xiii. 1906, p. 11. 



[22. Vireo calidris calidris (Linn.). 



Motacilla Calidris Linnaeus, .S//sV. Xat. x. p. 184 (1758. — based on Edward.s, Xat. Hisl. Birds iii. 



p. 121. pi. 1'21. fij. inf. [pessima !] : Jamaica). 

 Vireosylvia 7ii7/stacalis Pelzeln, I.e. p. 73 (Borbu). 



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 \'. 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 bnffy 

 whitish in V. c. barbatula (from Cuba and Bahama Islands) and V. c. barhadcnsis 

 (from Santa Lncia, Guadeloupe, S. Vincent, etc.) ; cheeks and malar region are 

 tinged with pah; 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 I', c. 



