( 284 ) 



of wliite on the fail. It iiihaliits Brazil nnrHi of thi' Amazon, C'a5cnnf, (Juiana, 

 Venezuela, and Trinidad. Possiljly, the female recordeil by Itiker and Chaiiman 

 s.n. '/'. melanurus * should also be referred to T. m. xemifagciatus. 



:^0. Dysithamnus incertus (Pelz.). 



TliaiHiinjihiliai iiifeitiii Pelzeln, Zm- (Iniitli. Uni^il. ii. (ISCiH) p. 14il, descr. J [Par:i--coll. Nattercr, 



Mu?. Vindob.]. 

 Tluiiiinn/ilnliis sinijili:r Sclater, /his, 1873. p. 387. tab. .w. descr. ^ ? [Para] : Sclater & Salvin, 



P. Z. s. 1878. p. 139 [Vigia, near ParaJ. 

 Vi/'iitliamniis phimhpiis (nee Wied !) Sclater & Salvin. P. Z. .s'. I.si"i7, p. .r,7('i ['• Amazons "].t 



No. 1900. S ad., Igarape-Assii, Pan'i, "iti ni. : .liuinnry 17, I'-iiil. Al. Tn ; 

 cand. no ; rostr. \>^\ mm. 



No. 1960. cJ jr., Igarape-Assii, Pant, Tiii m. ; Pfhruary '2, ]'.iii4. Al. fi; ; 

 cand. 5.5 ; rostr. ; ITi mm. 



No. 1933. ((?) jr., Igarape-Assii, Para, .")(i ni. ; January 'J-J, liiii4. Al. fi.i ; 

 land. S.5; rostr. 18^ mm. 



No. 1912. ? ad., Igarape-Assii, Para, 50 m. ; January is, l'.»u4. .\1. 05; 

 cand. 53i ; rositr. is mm. 



The first siiecimen is a fully adult male, tlie two next show some remains of 

 the yonng jilumage in having the quills and wing-coverts edged or washed with 

 brownish. Otherwise they have attained the dress of the adult. 



The jjroper name of this species is the above one. Through the kindness 

 of my friend Dr. von Lorenz, of Vienna, I was enabled to compare the type of 

 'I'll. iricerfiiK Pel/., with those of T. simpler iScl. in the British Museum. As I 

 had e.xj)ected, the former agrees perfectly with tlie female of the latter species. 

 Pelzeln's name, being earlier, must be accepted, although he described only the 

 female. The female sent by Robert differs from the sjieeimeus just mentioned in 

 having narrow buft" apical margins on the inner secondaries. Throat and fore-neck 

 are paler ferruginous and less in contrast with the ochreons-brownish belly. 



Mus. Vindob. ? ad.. Para, 1834. (;oll. Natterer. Type of T. incertus Pelz. 

 Al. 60 ; cand. 55 mm. 



jrus. Brit. S ad., Para, 1ST3. Layard coll. Type of 7'. simj/lej- Scl. Al. 7",' ; 

 cand. 57 ; rostr. 18 mm. 



Mns. Brit. ? ad., Para, lo. i. '73. Layard coll. Type of 7'. simplex Scl. 

 Al. 70 ; cand. 6U ; rostr. 18 mm. 



I>. ineertus (Pelz.) is a very near ally of J>. xrliixtairus (D'Orb.) — in fact, its 

 north-eastern representative — the male diti'i'ring only in having the bend of the wing 

 and the lesser wing-coverts markedly freckled or edged with white, whilst they are 

 uniformly schistaceous in the latter bird. The females of the two species, however, 

 are easily distinguishable ; that of 1). srhistnceiis having the lower surface much 

 paler, bi'ownish buft', almost buti'y whitish on the throat and middle of the abdomen. 

 The male of /'. pluinhcits (Wied) is also very similar to the same se.x of 7-*. incertus, 

 but of a much darker slate-colour everywhere, has a considerably shorter tail, and 

 all the upper wing-coverts are edged with white. 



It is rather i|uestionable if these three species can ultimately remain in the 

 same genus as the short-tailed Ih/sitliamni, but they seem to fit better into the 



• Auh IS91, p. 28. 



f I have examined the bird collected by Wallace on the Lower Amazon, and found it to be identical 

 with the type of 7" i^iinplcx. in the Cat. Jlirds xv. p. 2'J(J it is agjiin orroneoiLsly recorded among the 

 specimens of Dt/sif/uttn/nis jfluiithciut. 



