( 312 ) 



to be a relialile character, for it is prpseut in the Corrieutes ami Paraguay birils. 

 I may add that in all adult males of A. polioitotus and of its northern form the head 

 is uniform black with no trace of the grey median stripe which is to be seen in 

 females and yonng birds.* 



Measurements of .4. polioiwtus : 



1. S ad., Paraguay, November 10, l.SiJ3.— Bohls coll. No. oD. Al. 77 ; caud. 7(1 ; 

 rostr. 14 mm. 



? ad., Paraguay, November 10, 1893.— Bohls coll. No. 50. Al. 70 ; caud. 02 ; 



o 



rostr. 141 miu. 



3. (? ad., Colonia Risso, Rio Ai)a, N. Paraguay ; A. Borelli leg., No. 241. 

 Al. l^ ; caud. 68; rostr. 14J mm. 



Specimens from Mattogrosso and Goia;6 differ from the typical form in their 

 decidedly narrower jugular band and in having the back of a paler grey with a slight 

 olivaceous suffusion. The black band across the foreneck, which in the type of 

 A. polionotus and in the examples from Paraguay is about 10 mm. broad, measures 

 only "'O mm. These differences, although slight, seem to be constant, and the 

 form from Central Brazil may bo regarded as a distinct subspecies. As I have 

 ascertained by examination of the type specimen, its ])roper name is 



Arremon polionotus devillii I'es Murs. 



Arremon Devillii Des Murs (ex Bonaparte MS.) ia Castelnau, Vn,j. Amir. SmJ, Oln. p. 60, tab. x.\. 



fig. 2 (185o) [no locality]. 

 A. dnillii Sclater, P. Z. X. 1856. p. 81 ['• prov. Goiaz in Brazil.''— Castelnau & Deville leg.— 



AIus. Paris]. 

 Arremon poliunvtiis (nee Bp.) Pelzeln, Zur Om. Brasil. iii. (18G9) p. 217. 

 Arremon (krillii + A. polionotus Sclater, Cut. Birds xi. (1886) pp. Hi, -278. 



Mus. Paris ; mounted in the gallery and labelled as follows : " Arremon de 

 Deville, Arremon Devillii, Bp. (T.), du Brisil, par MM. de Castelnau et Deville." 

 The stand bears the foUowiug inscription : " 1840— Cat. gen. No. 972. Arremon 

 Devillei Bonap., type de I'espece ; iudividu figure dans I'atlas du voyage. Province 

 de Go)/as, Brt^sil, par BIM. Castelnau et Deville."— Al. 71 ; caud. Of); rostr. 1.5 mm. 



This specimen is a young bird, as proved by the strong olivaceous tinge of the 

 back, by the presence of the greyish crown-stripe, by the pale brownish wash on the 

 sides of the body, and by the colour of the bill. The lower edges of the upper 

 mandible are dark brownish yellow, not clear yellow as in adult birds, and not so 

 sharply deiined against the blackish culminal stripe. The bird differs from adult 

 males of Chapada, Cuyaba, and Goiaz in the same way as does a female of true 

 A. polionotus (from Paraguay) from the adult males of the same locality, thus 

 jiroving that the differences are only due to age or sex. In both examples the back 

 and the ashy stripe along the middle of the occiimt show a distinct olivaceous 

 suffusion. in adult males the back is of a clearer slate-grey colour, with only 

 a faint greenish admixture here and there, and the crown-stripe is altogether 

 wanting or but slightly indicated by grey edges to some of the feathers. The sides 

 of the body are also pure ashy grey, whereas they are of a jnilc brownish tnit m 

 females and young males. The ground colour of the under surface in Des Murs' 

 type, however, is pure white, as in adult males. In all other respects the type 

 of A. (lerillii fully agrees with specimens from C. Brazil, and I have not the 

 slightest doubt it is a yonng male of the northern form of .1. polionotus. 



* The same has been stated by Mr. AUen ilivll. Amir. Mus. iii. p. 3G2 : " A. polionotus "). 



