51. AGVRTRIA. 187 



Ois.-Moucfies, i. p. 2-i8, iv. p. 17(3 ; id. Ann. Soc. Linn. Lyon, xsii. 



p. 205. 

 Thaumatias viridissimiis, Bunn. 8i/st. Ueb. ii. p. 344 ? 

 Agyrtria uialvina;, Cab. S,- Heine, Mus. Hein. iii. p. 33 ; Heine, J.f. 



brn. 1863, p. 183. 

 Ap;yrtria terpna, Heine, J.f. Orn. 1863. 

 Leucochloris linna;i, Muls. ^- Verr. Class. Troch. p. 32. 

 Polytmus linnsei, Gray, Hand-l. B. i. p. 128. 

 Thaumatias tobaci, Elliot, Ibis, 1878, p. 49; Elliot, Sijn. Troch. 



p. 206 ; Eudes-Desl. Ann. Mus. Caen, i. p. 383 ; Salv. Ibis, 1885, 



p. 435. 

 Thaumatias terpna, Mids. Ann. Soc. Linn. Lyon, xxii. p. 205. 

 Agyrtria maculata, Cab. <$• Heine, Mus. Hein. iii. p. 33 ; ScL Cat. 



Am. B. p. 313; Heine, J.f. Orn. 1863, p. 184; Felz. Orn. Bras. 



p. 29 ; Scl. ^- Salv. F. Z. S. 18G7, p. 554. 

 Agyrtria viridissima terpna, Berl. J.f. Orn. 1887, p. 330. 



Adult male. Upper surface dark shining bronzy green, darker on 

 the head ; throat and breast glittering grass-green ; middle of the 

 abdomen -white ; flanks shining green ; under tail-coAcrts grey, 

 broadly edged with white ; tail dark steel-blue, median pair of rec- 

 trices bronzy green, lateral greenish at the base and on the edges of 

 the outer webs and tips ; maxilla blackish ; mandible flesh-colour, tip 

 black. Total length about 4 inches, wing 2-2, tail 1-2, bill 0-9. 



Adult female. Similar to the male, but with the tips of the lateral 

 rectrices grey. 



Mr. Elliot identifies this bird with Latham's " Tobago Humming 

 Bird " (TrocJiilus tobaci, Gm.), but I much doubt if he is correct in 

 so doing ; and I agree with Count Eerle])sch that this name is 

 better applicable to an Amazilia of the erythronota group, perhaps 

 to A. erythronota itself. Trochiliis maculatus, VieilL, probably 

 applies to this species, and was so assigned by Cabanis and Heine, 

 but there are discrepancies in the description which render this 

 determination doubtful. On the whole Lesson's title 0. viridissima 

 is the least unsatisfactory one to use, and this is Count Berlepsch's 

 opinion. 



I feel very doubtful as to the status of A. apicalis and A. 

 macxdicaiida with respect to A. viridissima, but the materials before 

 me are insufficient and the data respecting them too imperfect to 

 enable me to decide how many forms can really be recognized. It 

 would not surprise me if eventually only one is admitted, with a 

 range extending from Guiana to Colombia. 



A. fluviatilis can apparently be always distinguished by the bluer 

 shade of the throat ; and, in the male, by its uniform tail. 



Hab. Guiana, Venezuela, Trinidad, and Lower Amazons Valley. 



a, b. cJ ad. sk. Trinidad. Gould Coll. 



c, d. (S a.i.; e-ff. MerumiS Mts., Brit. Guiana, Salvin-Godman & 



$ad. sk. July {H. Jl'Tiitely). Sclater Colls. 



A. S ad.; i. $ Roraima, Brit. Guiana, Nov. Salvin-Godinan Coll. 



ad.sk. {H. W.). 



j-m. S ad. ; n. 5 Cayenne. Salvin-Godman, 



ad. sk. Gould, & iSclater 



Colls. 



