338 Dr. A. von Pelzeln on a neiv Humming-bird. 



Subsequent careful examination of this bird and compari- 

 son with the allied species persuaded me that it was really of 

 a distinct species^ not yet described. 



I take the liberty of dedicating this species to Countess 

 Albertina Marschall, daughter of Count August jMarschall, 

 to whom science owes so many important contributions. 



Natterer^s notes on the unique specimen (a male) are 

 the following : — 



" Salto do Girao, October 8, 1829, in high forest on a lofty 

 tree, together with other little birds. The bird was some- 

 what moulting. Iris dark brown. Bill black, not glossy, 

 the under maxilla light corneous grey. Feet dark bluish 

 ash-grey, nails of the same colour. Length 5|", breadth 8^" ; 

 the tail surpasses the wings 13'"." 



For comparison I add Natterer^s notes on a specimen of 

 C. gyroloides. 



" Male, adult, moulting, Marabitanas, March 1, 1831, in 

 a high forest with other Tanagers. Iris dark brown. Bill 

 blackish brown, the under maxilla on the basal half greyish. 

 Feet dark bluish grey, washed with violet, nails dark grey. 

 Length 5" 10"', breadth 8" 2'" ; the tail surpasses the wings 

 13'''." 



Besides the male from Marabitanas, Natterer collected three 

 other specimens of C. gyroloides on the Rio Xie. 



Heliangelus taczanowskii. 



H. corpore supra viridi, pileo obscuriore, nucha et uropygio 

 nitore aurescente, gula juguloque brunneo-nigris, plumis 

 stricte albido, versus pectus latins viridi marginatis ; gulas 

 macula rufo-violacea metallica vivide splendente, vitta 

 pectorali transversali alba, circa 2'" lata ; abdomine viri- 

 di medio ochraceo admixto, tectricibus caudae inferiori- 

 bus albis, centro nigro-brunneis ; caudse parum rotun- 

 datse rectricibus mediis aureo-viridibus, reliquis brunne- 

 scenti-chalybeis, nonnullis macula terminali minutissima 

 alba ; rostro nigro, pedibus nigrescentibus. Long. 3^', 

 alse 2" 4"', rostri a fronte 8'", caudse 19'"; rectrices ex- 

 timse 2'" breviores quam mediae, 



Hab. Bogota [Herr M'dnsberg). 



Nearly allied to H. clarissce ; but the wings are considerably 



