On New Neotropical Birds. 367 



columbiano olivaceo-fusco, gula pectore abdomineque ut in 

 Ph. rufo ochraceo-fulvis unicoloribus (nee abdomine ut in 

 Ph. columbiano pallidiore vel minus ochraceo). Rostro 

 quam in Ph. columbiano breviore, quam in Ph. rufo vix 

 longiore. 



Al. 93-891, cauc i. 83^ culm. 19|-18f, tars. 22| mm. 



Habitat : Bolivia orientalis : Sta. Cruz de la Sierra et in 

 Bolivia occidentali : Songo. 



Typus : in Mus. H. v. B. ad. Santa Cruz, 24th August 

 1889. [G. Garlepp leg. No. 219.] 



This Philydor, of which Mr. Garlepp sent four specimens, 

 two from Sta. Cruz de la Sierra in the east, and two from 

 Songo in the western Yungas of Bolivia, is somewhat 

 intermediate between Ph. columbianus and Ph. rufus. With 

 the former it agrees in the olivaceous-brown coloration of 

 the pileum, with the latter in the more uniform shade 

 of the underparts, the breast and the abdomen being 

 of the same deep fulvous as the throat, not greyish or 

 olivaceous-fulvous as in Ph. columbianus. 



The bill is shorter than in Ph. columbianus, and longer 

 than in Ph. rufus. At all events it is nearer to Ph. 

 columbianus, and should stand as a subspecies of it. 



27. Thamnophilus heterocercus sp. n. 



Mas mari Th. ambigui (Sws.) simillimus, differt rectricibus 

 sex vel octo externis in vexillo externo (nee in interno) macula 

 alba signatis, rectricibus duobus vel quatuor intermediis 

 unicoloribus nisi macula alba terminatis, corpore subtus 

 clariore griseo, abdomine medio pure albo, necnon rostro 

 breviore graciliore. 



Foemina a foemina Th. ambigui differt abdomine medio 

 albicante, pectore lateribusque corporis clarius fulvescentibus. 



c? S ad., al. 714-68, caud. 59*-53i, culm. 17-15f, tars. 22|- 

 22| mm. 



? ? ad., al. 66^-65i, caud. 56-53^, culm. 1Q\, tars. 22 mm. 



Habitat : Sta. Cruz de la Sierra, Bolivia e orientalis. 



Typus : in Mus. H. v. B. : c? Santa Cruz, 11th June 1889. 

 [G. Garlepp leg. No. 112.] 



This Bolivian representative of Th. ambiguus (Sws.) of 

 Brazil is easily to be distinguished, the two or four middle 



