Sp. 5. Petasophora iolota, sp. nov. Pet. capite, et corpore su- 



periore saturate viridibus ; mento, spalio suboculari, auribus, et 



viedio abdoniine intense, metallice, cyaneis ; corpore inferiore ni- 



tense viridi ; guld guasi tessellatd, quia medite plunue quam pogonice 



extremcc obscurius nitent ; tectricibus caudae inferioribus paUidis 



ad margines palUdioribus . 



Head and all the upper surface deep green, in some specimens 



tinged with gold; primaries and secondaries brown, tinged wit!i 



purple ; chin, space beneath the eye, ear-coverts and the centre of 



the abdomen rich deep metallic blue ; all the under surface rich deep 



glossy green, the throat presenting a tessellated appearance, occa- 



sioned by the reflection from the webs throwing a darker hue on the 



centre of each feather ; under tail-coverts pale, with lighter margins ; 



two centre tail-feathers golden green, the remainder steel or bluish 



shining green, crossed near the extremity by a broad band, which is 



dull black on the upper surface and shining steel-blue on the under ; 



bill and feet black. 



Totai length, 5į inches ; bill, If ; wing, 3f ; tail, 2\. 

 The female is similar to the malė in plumage, but smaller in size. 

 Nearly allied to the preceding, but larger and finer in every respect. 

 Hab. Bolivia. 



Sp. 6. Petasophora coruscans. 



Vide Proc. of Zool. Soc. Part 14. pp. 44 & 90. 



Sp. 7. Petasophora Delphinje. 



O. Delphince, Less. Rev, Zool. 1839, p. 44; Echo du 

 Monde savante, 1843, no. 31; Less. 111, de Zool. 

 tom. ii. 1832, pi. 64. 



Sp. 8. Petasophora ? Geoffroyi. 



Trochilus Geoffroyi, Bourc. et Muls. Ann. de Lyons, 

 tom. vi. p. 37. 

 It will probably be necessary at some future period to make this 

 the type of a new genus. 



The eight species enumerated above comprise every member of 

 this beautiful genus with which I am acąuainted ; I possess, how- 

 ever, some immature specimens which may be referable to a ninth 

 species, in vvhich case it will prove to be most nearly allied to P. ser- 

 rirostris. They diflFer from that bird in having the two outer tail- 

 feathers rather largely tipped with white, the lower part of the ab- 

 domen greyish ■vvhite, and in the ear-coverts being very diminutive. 

 Although I have little doubt of their being distinct, I prefer seeing 

 other specimens before characterizing them. 



Genus Okeotrochilus, n. g. 

 Rostrum capite longius, subcylindricum, paulo incurvum. Ala sub- 

 grandes valentes. Cauda magna, rotundata, rectricibus attenuatis, 

 submucronatis, rigidis. Pedes fortes. Digitus et unguis j^ostici 

 digito et imgui mediis longitudine aeąuales. Tarsi plumis ves- 

 titi. Gula luminosa infiu torquata. 



