( 49 ) 



In Southern Minas Geraes (Saute F6) and the province of Rio de Janeiro, 

 M. c. cai/anensis is represented by M. c. cri/tliroptera Lafr. This form is of the 

 same size or even larger than the Central Brazilian examjjles of M. c. cayanensis, 

 but differs at a glance by the much greater extent of rusty on the wings, the two 

 basal thirds of both webs of the primaries being of that colour. I have examined 

 the following specimens : 



Mns. H. V. Berlepsch. Adult, Rio-make . 

 Mas. Brit. Adult, Rio-make .... 



,, „ S ad., Rio de Janeiro. Fry coll. . 



„ ,, ? ad., Rio de Janeiro. Fry coll. . 



„ „ Adult, S. F6, Minas. Rogers coll. 



M. cai/anensis rufipennis Lawr., from N. Venezuela (Valencia, Puerto Cabello, 

 Merida, Cumand, Orinoco valley, etc.), is another well-characterised form. Cf. 

 Hellmayr, Abkandl. Akad. Wiss. Miinchen ii. KI., Bd. xxii. 3. 1906. pp. 649-50. 



74. Rhynchocyclus flaviventris flaviventris (Wied). 



Muscipeta flai'heiitris Wied, Beitr. N'ltunj. Bras. 3. ii. p. 929(1831. — "in der Gegeud der Fliisse 

 Mucuri und Alcobafa," Espiritu Santo, S.E. Brazil). 



Nos. 2305, 2323. c? ? ad., Rio Araguaya, July 1906.— Wing 62, 60 ; tail 55, 52 ; 

 bUl 10|, lOJ mm. 



Agreeing in colour and size with several skins from Bahia, which we may 

 consider typical. 



On the Rio Madeira a much paler form is found which has been separated 

 as R. Jlaviventer barbae Helim. Cf. my remarks in Verhandl. Zool. Botan. 

 Gesellsch. Wien, 1903. p. 208. 



Another very close ally, R. fladioentris ciridiceps Scl. & Salv., * occurs in 

 Pern and Eastern Ecuador. The Tring Museum has a specimen obtained on the 

 Rio Napo by Mons. L. Petit, formerly in Comte de Dalmas' collection. 



75. Sirystes sibilator sibilator (Vieill.). 



Muscicapa sibilator Vieillot, Noiw. Diet. xxi. p. 467 (1818. — ex Azara : No. 191. — Paraguay). 

 Muscicapa sibilans Lichtenstein, Ven. Dubl. Berliner Mus. p. 54 (1823. — S. Paulo). 



No. 1745. (? ad., Faz. Esperan(,'a, January 1906. — Wing 97 ; tail '66 ; bill 

 19 mm. 



Perfectly similar to specimens from Paraguay (topotypical) and South-eastern 

 Brazil (Parand, S. Paulo, Rio de Janeiro). 



In South America there are three well-marked geographical forms of this 

 bird to be distinguished, the characters and ranges of which are as follows : 



(a) S. sibilator sibilator (Vieill.). 



Paraguay (Azara) : Sapucay (Foster coll.— Mus. Tring). South-eastern Brazil : 

 Arroio Grande, Rio Grande do Sul (Bischoff ) ; Ro(;a Nova (Robert), Curytiba, 

 Parand(Natterer); Ytarar^, Goyaba, Ypauema, Cachoeirinha, RioParand (Natterer), 

 Victoria (Hempel), San Paulo ; Rio de Janeiro (Fry coll.— Brit. Mus.), Cantagallo 

 (Euler) ; Minas Geraes : Lagoa Santa (Burmeister — sp. in Mus. Halle, vidi) ; 

 Goyaz : Faz. E8peran5a (Baer) ; Bahia (trade-skin in Mus. H. v. Berlepsch). 



• Rhynchucyclus Hridicejis Sclater & Salvin, P.Z.S. Land. 1873. p. 280 (Pebas, N.E. Peru). 



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