go PROCEEDINGS^ OF THE NATIONAL MUSEUM. 



VOL. XXV. 



with Thaiitnoj^hilvx caerxh'xe^-ris, from which, however, it is at least , 

 subspeeitically distinct. All the specimens we have seen are from 

 Brazil, and are quite uniform in characters, thoug'h some of them are 

 more plainly barred on the lower tail-coverts than is the type; and 

 while the present form may ultimately prove to be Init the geo- 

 graphical representative of T. n/miJesn^n.s in Brazil, there is at pres- 

 ent no evidence of intergradation. From Thamnophihi^ aaerhi.s. with 

 which it agrees in general appearance, it differs in decidedly shorter, 

 weaker bill, somewhat paler abdomen, and broader bar on the median 

 portion of the outermost rectrix. A female, apparently belonging to 

 this new species, has a shorter bill than the same sex of T. itOrrJiis. is 

 appreciably less rufescent above, with the tail, particularly on the 

 middle feathers, more blackish; and in place of the dull, grayish 

 ochraceous of naeriif.s. is conspicuously rufous below, anteriorly shaded 

 with olive. 



This form seems never to have received a name, since T)i<(iniio2>hlhis 

 caerxilesceii^ Vieillot,' and ThamnojyUhis auratus of the same author,' 

 both based on Paraguay specimens, as well as Thainnoplul ns rent nil !s 

 Sclater.' all refer undoubtedly to the white-vented bird. It is l)arely 

 possible that Thantnophihis pllratn.s Svi'<imi^ox\' is the immature male 

 of the bird here described, but unless consideral)le allowance is to l)e 

 made for error of description this seems not to be the case. 



Family FURNAKIID.F:. 



SYNALLAXIS SPIXI NOTIUS, new subspecies. 



Chars. .s?y.%>,— Similar to SyiutUaxls spixl spixi, but nuich more 

 grayish above; sides, flanks, and crissum grayish, or but very slightly 

 rufescent. 



Description.— Ty^^, adult male. No. 55783, F.S.N.M.; Conchitas, 

 Buenos Ayres, Argentine Republic, November, 1868; William H. 

 Hudson. Crown and forehead bright chestnut; rest of upper parts 

 dark grayish brown, somewhat rufescent on the back; tail similar, but 

 slightly darker; wings fuscous, margined externally with olive, the 

 median and lesser coverts chestnut, the greater series edged with the 

 same; sides of head and neck, including supraorbital region, deep 

 brownish gray; center of chin and throat black with silvery gray tips 

 to many of the feathers; remainder of lower surface down to the 

 breast -brownish gray; abdomen pale brownish gray, the sides and 

 crissum much darker and with a very slight tinge of rufous; lining of 

 wing buft". Length of wing, 49 mm.; tail, 71 mm.;^ exposed culmen, 

 14 mm.; tarsus, 19 mm.; middle toe, 13 mm. 



iNouv. Diet. d'Hist. Nat., Ill, 1S16, p. 311. 



ndeiu, !>. ;512. 



■^Edinburgh New Philos. .lourii., new ser., I, 1S55, p. 244. 



*Zool. .T(.urn., II, lS2ri, p. Ml. 



^•Tail imperfect. 



