1870. ] ON NEW COLUMBIAN BIRDS. 843 
Ty anniscus chrysops, Sclater, Cat. Am. B. p. 216. 
Tyrannulus flavidifrons, Scl. P. Z.S. 1860, p. 69. 
Tyranniscus flavifrons, Scl. Cat. Am. B. p. 216; Cab. et Wein. 
Mus. Hein. ii. p. 56 (1859). 
Hab. Ecuador and Bogota (P. L. 8S.) ; Sierra Ocaiia (Wyatt). 
(4) TyRANNISCUS VILISSIMUS. 
Elainea vilissima, Sclat. et Salv. Ibis, 1859, p. 122, pl. 4. f. 1; 
Salvin, Ibis, 1860, p. 194. 
Tyranniscus vilissimus, Scl. Cat. Am. B. p. 216. 
Hab. Guatemala. 
(5) TyRANNISCUS IMPROBUS. 
Hab. Venezuela, Merida (Goering) ; Sierra Ocaiia (Wyatt). 
(6) TyRANNISCUS PARVUS. 
Tyranniscus parvus, Lawr. Ibis, 1862, p. 12; Ann. N. Y. Lye. 
vii. p. 473; Scl. & Salv. P. Z. S. 1864, p. 359; Salv. P. Z. S. 1867, 
p. '47. 
Hab. Panama (M‘Lennan) ; Veragua et Costa Rica (Aree). 
(7) TyRANNISCUS LEUCOGONYS. 
Hab. Bogota (P. L. S.). 
(8) TyRANNISCUS GRACILIPES. 
Tyranniscus, sp. 1317, Scl. Cat. A. B. p. 216. 
Tyranniscus gracilipes, Sclater, MS.; Sel. & Salv. P. Z. 8. 1867, 
p- 981. 
Mytopatis pusilla, Pelz. Orn. Bras. p. 106. 
Hab. Fastern Peru, Pebas (Hauxwell). 
(9) TyRANNISCUS GRISEICEPS. 
Hab. Ecuador ; Babahoyo and Pallatanga (Fraser). 
6. TROGON CHIONURUS, sp. noy. 
Trogon viridis, Scl. et Salv. P. Z. S. 1864, p. 364; Lawr. Ann. 
L. N. Y. vii. p. 290. 
Similis T. viridi, sed maris rectricibus externis fere omnino albis, ita 
ut cauda clausa omnino alba esse videtur. Femina etiam rectricum 
externarum apices late albos ostendit. 
Hab. Panama (M‘Leannan). 
Mus. 8.-G. et G. N. Lawrence. 
We have examined numerous specimens of this Trogon from 
Panama, and have hitherto referred it to 7. viridis. We convinced 
ourselves some time ago, on examining an example from Mr. Law- 
rence’s collection, that it was not really 7’. viridis, but were then 
doubtful whether it might not be 7’. venustus, Cab. et Hein. Mus. 
Hein. ii. p. 194. On going into the question again, aided by addi- 
tional skins of 7’. viridis from various localities, we feel convinced that 
