142 MESSRS. SCLATKR AND SALVIN [Feb. 13, 



may remark that Azara (Apunt. ii. p. 250) described these two birds 

 as sexes, although he had already described (/. c. p. 1 17) the female 

 as a different species. 



40. Machetornis RixosA (Vieill.); Burm. I.e. p. 458, 



41. Centrites NIGER (Bodd.) ; Burm. I.e. p. 458. 



42. Serpophaga subcristata (Vieill.) ; Burm. /. c. p. 454. 



43. Serpophaga nigricans (Vieill.) ; Burm. I.e. p. 454. 



44. Elainea modesta (Tsch.) ; Burm. I.e. p. 454. 



Agrees with the Chilian birds. See Sclater's notes upon this 

 speci^es, P. Z. S. 1867, p. 327- 



45. Pitangus bellicosus (Vieill.). 

 Saurophagus sulphuratus, Burm. I.e. p. 452. 



46. Myiobius n.*;vixjs (Bodd.). 



Not mentioned by Burmeister. Larger than, and possibly distinct 

 from, the northern species (in which case it will, perhaps, stand as M. 

 auriceps, Gould); but our series of specimens is not sufficient for 

 comparison. " Summer visitor." 



47. Pyrocephalus rubineus (Bodd.). 

 P.parvirostris, Gould ; Burm. I. e. p. 456. 



" Summer visitor." 



After comparing a large series of skins of this form from many 

 parts, we only feel satisfied as to the distinguishability of the northern 

 P. mexicaims, which seems always larger in size and paler in colour. 



48. Tyrannus melancholicus (Vieill.) ; Burm. I. c. p. 452. 

 " Summer visitor." 



49. MiLVULTJS violentus (Vieill.). 

 Tyrannus violentus, Burm. /. e. p. 453. 



50. Podager nacunda, Vieill. ; Burm. 1. c. p. 449. 



51. Stenopsis bifasciata, Gould; Sclater, P. Z. S. 1866, p. 140. 

 Antrostomus longirostris, Burm. I. c. p. 450. 



A single skin of an immature bird, probably referable to this 

 species. 



52. Guira piririgua (Vieill.). 

 Ptiloleptis (juira, Burm. I. c. p. 443. 

 " Iris red." 



