AGYRTRIA C^RULEICEPS. 



Blue-headed Emerald. 



Thaumatias cceruleiceps, Gould, Proc. Zool. Soc. 1860, p. 307.— Id. Intr. Trochil. 8vo, 

 p. 152 (1861).— Mulsant, Hist. Nat. Ois.-Mouches, i. p. 240 (1874) —Elliot 

 Ibis, 1878, p. 52. 



Jgyrtriacaruleiceps, Elliot, Synopsis of the Humming-Birds, p. 206 (1878). 



are 



The present species belongs to the section of the genus Agyrtria in which the throat and breast 

 metallic green. It is allied to A. nitidifrons, but differs in having the crown of the head and back of 

 the neck shining greenish bine. It comes from Colombia, and the types are in the Gould Collection. 



The following is the original description of the species : — 



" Crown of the head and back of the neck deep shining greenish blue ; back and shoulders green, 

 passing into bronzy green on the rump and upper tail-coverts; tail nearly uniform bronze, with a very 

 faint indication of a zone of brown across the outer feathers near the tip ; wings purplish brown ; sides 

 of the neck glittering bluish green, the blue tint predominating on the ear and immediately under 

 the eye; centre of the throat and chest broken glittering green and white; flanks bronzy green; under 

 tail-coverts grey, with brown centres ; upper mandible dark brown ; under mandible yellow, except the tip, 

 which is dark brown. Total length 3i inches, bill xf, wing 2i tail i." 



[R. B. S.] 



AGYRTRIA FLUVIATILIS 



Riverine Emerald. 



Thaumatias fluviatilisy Gould, Intr. Trochil. 8vo, p. 154 (1861). — Scl. & Salv. Proc. Zool. 

 Soc. 1866, p. 194.— lid. Nomencl. Av. Neotr. p. 92 (1873).— Elliot, Ibis, 

 1878, p. 51.— Mulsant, Hist. Nat. Ois.-Mouches, i. p. 253 (1874). 



Agyrtria fluviatilis, Heine, Journ. fiir Oru. 1863, p. 184. — Elliot, Synopsis of the Humming- 

 Birds, p. 207 (1878).— Tacz. Orn. Perou, i. p. 404 (1884). 



The present species is placed, accordiiii,^ to the arrangement set forth hy Mr. Elliot, in the section of 

 the genus in which the crown of the head is dull green, and the under tail-coverts white with a central 

 streak of hrown or green. It differs from all its near allies in having a black tail, and the throat and 

 breast grass-green with a slight bluish tinge. 



The original specimens are in the Gould Collection, and were received from the Rio Napo. It was 

 afterwards met with by Mr. Edward Bartlett on the Lower Ucayali at Yurimagnas, and Mr. Hauxwell has 

 sent specimens from Pebas. Mr. Stolzmann has likewise met with the s|)ecies at Yurimaguas. 



The figures in the Plate have been drawn from a male bird procured in the latter locality, and lent 



to us by Messrs. Salvin and Godman. 



[R. B, S.] 



