FLOIIISUGA. MELANOTROCHILTJS. 393 



more or loss white at the tips, nnd tlie under surface bronzy green 

 with more or less white on the throat and abdonieu. Wing 65 mm. 



The female described was collected bv Mr. McConnell on the 

 Lower Mazaruni River. 



Immature male. Similar to the female, but differs in having a 

 trace of the white collar on the hind-neck and more white on the 

 outer tail-feathers; breast and sides of the body brown with a 

 tinge of green, and the throat darker brown with white edges 

 to the feathers. The description is taken from an individual 

 collected on the Ituribisi lliver. 



Breeding-season. Unknown in British Guiana. 



Kest. Unrecorded in British Guiana. 



Eggs. Undescribed from British Guiana. 



Range in British Guiana. Ituribisi liiver, Supenaam River, 

 Takutu River, Bartrica, Bonasika River, Makauria River, Lown-r 

 Mazaruni River, Arwye River, Great Falls Demerara River 

 (McConnell collection) ; Merume Mountains, Annai^ Kamarang 

 River (Whitlei/) ; Aruka (Schomhurgk). 



B.vtralimital Range. North Brazil, Peru, Ecuador, Colombia, 

 Trinidad, Tobago, and Central America to South Mexico. 



Habits. Schomburgk states (Reis. Guian. iii. p. 706) that this 

 brautiful Humming-bird is unquestionably the most common in 

 British Guiana. In Aruka he often saw hundreds of these birds 

 swarmino; like bees round the flowerin"; Lo<juminosen. Their 

 liMunts appear to be the woods, in which thcj seem to select the 

 flowering Masaceen and Scitamineen for obtaining food. He 

 i-emarks that the young male does not attain its full plumage 

 until it is two or three years old. 



Genus MELANOTROCHILUS Deslongch. 



Melanoirochihts Deslongcliamps, Ann. Mus. d'Hist. Nat. Caen, i. 

 p. 224, pi. iv. fig. 4, 1880. Type M.fuscus (Vieill.). 



Tliis genus is di.stingui.shed by the slightly emarginate tail, the 

 two middle feathers being the shortest, the four outer ones on each 

 side about ecpial in length and oblique at the tips, and the shorter 

 Tipper tail-coverts. 



265. Melanotrochilus fuscus. 

 Dusky Jacoijin. 



Trocliil us fuscus Vieill. N. Diet. d'Hist. Nat. vii. \\ 318, 1S17 (Brazil). 

 llorisuijafusca Salvin, Cat. B. Brit. Mus. xvi. p. 331, 1892. 



