264 TRocniLi. 



Kfij to the S2>erii's. 

 c Tail not uiiifunn. 



a'. More than the basal half of the lateral rec- 

 trices white or buff. 

 a". Lateral rectriccs, except the outer and 

 terminal portion of the outermost two on 



either side, white leucurus, p. 264. 



6". Lateral rectrices, except the outer and 

 terminal portion of the outermost two 



on either side, bufF cervinicauda, p. 265. 



b'. Basal half of the lateral rectrices white, ter- 

 minal half black with white tips. 

 c''. Chestnut gular spot large ; central rec- 

 trices shining green ruckeri, p. 265. 



d". Central gular spot small ; central rec- 

 trices greenish black fraseri, p. 266. 



b. Tail uniform olive-black antonice, p. 266. 



1. Threnetes leucurus. 



White-tailed Humming Bird, Edwaj-ds, Glean. Nat. Hist. i. p. 99, 



pi. 256 ; Lath. Sipi. i. (2) p. 757. 

 Polytmiis surinamensis, Bn'ss. Orn. iii. p. 674. 

 Colibri a collier rouge, Bvff. Hist. Nat. Ois. vi. p. 59. 

 Colibri a collier rouge de tSurinam, Buff. Fl. Enl. 600. f. L 

 Trochilus leucurus, Lhin. Syst. Nat. i. p. 190 ; Gni. ISyst. Nat. i. 



p. 487 ; Vieill. N. Diet. d'Hist. N. \i\. p. 348 ; id. JEnc. Meth. 



p. 552; Less. Traite d'Orn. p. 290 ; id. Hist. Nat. Col. p. 83, 



pi. 22 ; id. Ind. Gen. Troch. p. xii ; d'Oib. ^' Lafr. Syn. Av. ii. p. 32. 

 Glaucis leucurus, B]}. Consp. Av. i. p. 67 ; 3Iuls. ^ Terr. Class. 



Troch. p. 14 ; Mids. Hist. Nat. Ois.-Mouches, i. p. 49, iv. p. 137 ; 



id. Ann. Soc. Linn. Lyon, xxii. p. 200; Elliot, Syn. Troch. p. 7. 

 Threnetes leucnrus, Goidd, Mon. Troch. i. pi. 13 (Oct. 1852); id. 



Intr. Troch. p. 60; Meich. Aufz. d. Col. p. 15; Bp. Rev. Zool. 1854, 



p. 249 ; Heine, J.f. Orn. 1863, p. 175 ; Salv. ^- Elliot, Ibis, 1873, 



p. 277 ; Elliot, His, 1877, p. 142 ; Eudes-Desl. Ann. Mus. Cam, i. 



p. 92 ; Boucard, The Humming Bird, i. p. 17. 

 Polytmus leucurus, Gi-ay, Hund-l. B. i. p. 126. 



Adult. Upper svirface shining green ; lores, ear-coverts, and chin 

 black ; a buff malar stripe on either side, a fulvous patch on the 

 breast; abdomen grey ; chest and flanks mottled with black ; under 

 tail-coverts with dark greenish-black discs ; central rectrices like 

 the back, outermost pair on either side white at the base, with a 

 large black patch over the distal portion chiefly on the outer web, 

 the next I'ectrix is almost pure white, those next the central pair 

 dark mottled with white, with a white margin and white tip : bill 

 black, the basal two thirds of the mandible whitish ; feet yellow. 

 Total length about 4-5 inches, wing 2-3, tail 1-35, bill 1-3. 



D'Orbigny is the authority for the extension of this species into 

 Bolivia. His specimen in the Paris Museum was examined by Mr. 

 Elliot in 1877, and its determination endorsed. 



Hah. Guiana and Bolivia. 

 a~f. Ad. ek. I'emerara. Gould Coll. 



