( 313 ) 



2 cJc? iicl. from Chiqnitos ex D'Orbigiiy in the Paris Museum belong also to tiie 

 form witli narrow black jugular band. 



Thus we have two sub.-iiiecies, the distribution of which is as follows : 



a. Arremon jjolioiiot.iis polionotus Bp. 



Hab. Corrientes, Argentina (D'Orbigny). Paraguay : Sapuoay (Foster) ; 

 Colonia Risso, Rio Apa (Borelli). 



h. An-i'mon polionotus denllii Des Murs. 



Similar to the typical form, but distinguishable by its decidedly narrower 

 jugular band, and by having the back of a lighter, paler grey colour, with a slight 

 admixture of olivaceous. 



Hab. Central Brazil: Goiaz (Casteluau & Deville); Cuyaba (Natterer) ; 

 Chapada (Smith) ; Urucum and Corumba (Borelli) ; 



Eastern Bolima : Chiquitos (D'Orbigny — Mus. Paris). 



9. Arremon wuchereri Scl. & Salv. = A. flavirostris Sw. S ad. 



Arremon flavirostris Swaiasou, Animals in ^[(■n<lg. (1838) p. 347 [" Brazil"]. 



A. wuchereri Sclater & Salviu, Nomend. Ai\ neoti-op. (1873) p. 278 [Bahia] ; Iheriog, Revisl. Mns. 



Paul, T. (I'JOl), p. -JliS [Jabotioabal, S. Paulo]. 

 A. flavirostris Reinhardt, Vidensk. Medcl. Kj^henhami (1870) p. 421 [Minas Geraes]. 



As can be seen from Mr. Sclater's key * to the genus, A. ivuchereri differs 

 from A. flavirostris only in lacking the cinereous vertical stripe. This character, 

 however, is very variable, and evidently depends on age, as we learn from 

 the examination of a large series of the allied ^1. polionotus. In this series the 

 adult males, witli pure schistaceous ujjper parts and pure white belly, have the 

 head uniform black, only the young males aud females show an olivaceous grey 

 vertical stripe. Through the kindness of Professor von Ihering, of S. Paulo, Brazil, 

 I had the opportunity of comparing some specimens of A. flavirostris, collected in 

 the north-eastern part of S. Paulo ; and in the Tring Museum there is one example 

 obtained by Mr. A. Robert in the province of Araguay, Minas Geraes. This series 

 presents the same variation us A. polionotus. In three specimens,! two of them 

 marked " ? " by the collector, there is a broad olivaceous grey vertical stripe, 

 beginning just above the eye and confluent with the olive-grey colour of the nape, 

 the sides of the body are pale greyish brown or brownish, and in one specimen 

 the chest, below the black jugular band, shows a slight buffy tinge. Both 

 characters are signs of immaturity. 



On the other hand, one <S (No. 4568, Bebedonro — Mus. Tring), with jiure 

 schistaceous nape and pure grey sides of the body, lacks the vertical stripe, some 

 feathers of the hind crown only showing narrow slate-grey margins. This is also the 

 case in the type of A. wuchereri, which differs from our specimens (ex Bebedonro). 

 only in its longer wings and in having the black jugular band slightly bmader 

 Yet, as will be seen from the measurements given below, one 6 from Jaboticubal 

 comes very near in the length of the wing, and I have no doubt the type of 

 A. wuchereri is nothing but a c? ad. of A. flavirostris. 



Mus. Tring, c? ad., Bebedouro, iv. 1904. Wing 75i ; tail 75| ; bill IT, mm. 



* Cat. Birds xi. p. 272. 



t No. 4567, Banx'tos— Mus. Paulist.; No. 4569, Bebedouro— Mus. Berlepsch; No. 4S2, .\. Robert coll., 

 Rio Jordao, Minas Geraes. 



