Vol. XXVI, pp. 63-64 March 22, 1913 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



A NEW BUMMINGBIRD OF THE GENUS CHLOROS- 

 TILBON FROM BRAZIL. 



BY J. H. RILEY. 



[By permission of the Secretary of the Smithsonian Institution.] 



While arranging the collection of hummingbirds belonging to 

 llif U. S. National Museum, I ran across three specimens belong- 

 ing to the genus Chlorostilbon that I have been unable to identify 

 and have reached the conclusion that they belong to an unde- 

 scribed species. It may be known as : 



Chlorostilbon puruensis sp. nov. 



Type.—U. S. National Museum, No. 177,034, adult male, Hyutanihan, 

 just below falls of the Purus River, Brazil, March 24, 1910. Collected by 

 J. B. Steere. 



Characters. — Differs: from Chlorostilbon prasinvs daphne in the darker 

 tone of the green above, in the bluish tinge on the chin, in the brighter 

 and more brilliant green below, in the longer bill, which is also brownish 

 on the lower mandible (black in C. p. daphne), and in having a longer 

 tail. 



Description. — Above bright green with coppery reflections, duller on the 

 top of the head and upper tail-coverts; chin bluish green; throat, breast 

 and abdomen brilliant, shining coppery green; the belly and flanks with 

 some white cot tuny feathers, mostly concealed ; under tail-coverts nearest 

 bottle green; tail steel blue; wing coverts color of the back; flight feathers 

 purplish blue; upper mandible black, lower mandible brownish, except 

 at extreme tip (probably dull reddish in life). Wing, 47.5; tail, 29; 

 culuien, 18 nun. 



Remarks. — This fine species is founded upon an immature and two adult 

 niales, all from the type locality. The other adult is molting and some- 

 what duller than the type; the culmen measures 19.5 mm. Five adult 

 males of C. p. daphne average : wing, 46.1; tail, 21.8; culmen, 16.1 mm. 

 1 have not a specimen of typical C. p. prasinus, but judging from descrip- 

 tions and the closely related forms, the species is quite distinct. Lesson's 

 type of Ornismya prasina most likely came from the coast of Brazil and 

 not from the interior. 



13-Proc. Biol. ^^c. Wash., Vol. XXVI, 1913. (633 



