(62) 



Xenops riililus Lichtenstein, Verz. Dubl. Berliner Mux. p. 17 (1823. — Bahia), 

 Zennjix affinis Swainson, Aiiim. ilenag, p. 352 (1838. — Brazil). 



Iu4. Xenops rutilus rutilus Lcht. 



Verz. Dubl. Berliner .Vu.i. p. 17 (1823.— Ba 

 m. ilmag. p. 352 (1838.— Brazil). 



No. 1670. S ad., Faz. Esi)eran9a, December 19u5. — Wing 64; tail 51; bill 

 i;}^ mm. 



No. 1T16. ¥ ad. Faz. EsperaiKja, January 1906. — Wing 65J ; tail 50 ; bill 

 Vi mm. 



No. 2390. f? ad. Rio Araguaya, August 1906.— Wing 64 ; tail 50 ; bill VZ mm. 



No. 2022. ? ad., Goyaz, April 1 906.— Wing 65 ; tail 50 ; bill 12^ mm. 



The series agrees in coloration and size with specimens from S. Paulo, 

 Mattogrosso and Jnjuy, Argentina, while Bahia skins are slightly smaller, 

 especially the tail being shorter. 



A'. i: rutilus is characterised by having the inner web of the fourth rectrix 

 only black, all the rest of the tail being cinnamon-rnfons. Sometimes the base of 

 the inner web of the third rectrix is also more or less blackish. 



In A'. /•. heterurus Cab. & Heine, of which a very large series has been 

 examined, the inner webs of both the third and fourth rectrices are black, and the 

 subexterual as well as the fifth tail-feather have likewise more or less black 

 at the base. Besides, the back is duller, more brownish (less cinnamomeons), 

 and the ground-colour of the nnder-parts greyish brown, barely sliaded with 

 olivaceous. 



A third form of this group is A', tenuirostn's Pelz.,* of which the type 

 and only known specimen has been kindly lent me by Dr. von Lorenz. In this 

 bird the third and fourth rectrix are wholly black, the fifth has the inner web 

 black, and there is also a black stripe along the inner web of the penultimate 

 rectrix. In size it agrees with A'. /■. rutilus, but the bill is much weaker and 

 slenderer. A', r. heterurus is much larger, with a decidedly stronger and more 

 powerful bill. 



The range of the three races is as follows : 



(re) A. rutilus rutilus Lcht. 



South Brazil : Bahia (Wncherer, many trade-skins in Bins. H. v. Berlepsch, 

 Tring, etc.) ; Rio Itabapuana, Rio de Janeiro (Wied) ; Lagoa Santa, Minas Geraes 

 (Lund) ; S. Paulo : Batataes (Lund), Ypanema (Natterer), Victoria (Hempel) ; 

 Paranil : Curytiba (Natterer) ; Goyaz : Faz. Esperan^a, Rio Araguaya, Goyaz 

 (Baer) ; Mattogrosso : Chapada (Smith), Villa Maria, Eugenho do Cap. Gama 

 (Natterer) ; Eastern Bolivia : Guarayos (D'Orbigny) ; N.^V. Argentina : Jujuy 

 (Dinelli— Mus. Tring). 



(b) A', rutilus heterurus Cab. & Heine. 



Xciiijps heterurus Cabanis & Heiae, Mus. Heineaii. ii. p. 33 (1859. — Colombia). 



Colombia : Bogotd coll., Sauta Elena, Antioquia, Bucaramauga ; Eastern 

 Ecuador : Baeza (Goodfellow coll. in Mus. Tring) ; Northern Peru : Guayabamba, 

 Chirimoto, etc. ; Central Peru : Vitoc, Garita del Sol ; Northern Venezuela, 

 Quebrada Secca and Campos Alegre, State of Cumana — Mus. Tring ; Trinidad : 



* Sittu7i)/»ber. Akad. Wiss, M'ien (math, naturw. L'l.), xxxiv. 1859. p. 112 (Sallo do Girao, liio Madeira). 



