THE HUMMING BIRDS. 365 



(partially exposed) dull ciQiiaiuonrufous ; tail clear cbestuut, the two 

 middle feathers broadly greenish brouze at tips (for about .28 of an inch 

 along shaft and for a much greater distance along edges) ; rest of the 

 tail-feathers similarly tipped with bronze, but this color gradually 

 decreasing in extent to the outer pair, on the inner web of which the 

 bronze is reduced to a very small angular space next to the terminal 

 portion of the shaft ; under surface of tail faintly glossed with purple; 

 remiges dull brownish slate or dusk}', faintly glossed with purplish. 

 Sides of head metallic green, like hind neck, etc.; chin, throat, and 

 chest brilliant metallic Paris-green ; breast metallic bronze-green (ex- 

 tending farthest back laterally), the bases of the feathers dull grayish 

 cinnamon ; belly and flauks light, buffy cinnamon, the under tail-coverts 

 vinaceous-cinnamon ; downy femoral tufts white; short dense feathers 

 clothing thighs and upper part of tarsus dull white, tinged with pale 

 buffy-grayish. Upper mandible pale brown (reddish in life ?), tipped 

 with blackish for about 0.15 of an inch ; lower mandible similar, but 

 paler. Length (skin), 4.00; wing, 2.25; tail, 1.50, middle feathers 0.20 

 shorter ; exposed culmen, 0.80. 



Young male (No. 74337, Fort Brown, Texas, August 23, 1877; Dr. J. C. 

 Merrill): Generally similar to the adult as described above, but upper 

 parts much more golden bronze-green, feathers of lower back and rump 

 margined terminally with dull light rusty and upper tail-coverts broadly 

 margined with light rusty; middle tail-feathers with outer webs wholly 

 dull metallic bronze, the terminal portion of both webs copper-bronze; 

 other tail-feathers marked subterminally with purplish black, this re- 

 duced on outer feather to an edging to outer web, but on next to the 

 middle pair occupying the greater portion of both webs near the tip; 

 top of head dull blackish brown, passing into dull rusty browi\ laterally. 

 Throat and chest not continuously brilliant green, but this color inter- 

 spersed with patches of dull buffy aud grayish-brown feathers. Upper 

 mandible black, becoming brownish at base; lower pale brownish, 

 blackish at tip. 



Young female (No. 74339, same locality and collector, date not given): 

 Similar to the young male as described above, but back, etc., purer 

 (less bronzy) green, middle pair of tail-feathers wholly bronze (darker 

 and more coppery terminally), purplish black subterminal spaces to 

 other tail-feathers much more extensive and more distinct, belly and 

 tlanks much duller and grayer butty, aud only the basal half of the 

 under mandible light colored. 



This bird is so closely related to the A. yucatanensis (Cabot) of Yuca- 

 tan that there is a strong probability that it will prove to be merely a 

 race of the same species. Although the type of A. yucatanensis ex- 

 hibits some characters of plumage which I have not been able to recog- 

 nize in any of the examples of A. cerviniventris which I have been able 

 to examine,* additional specimens show these differences to be incon- 



* See Proceedings of the U. S. National Museum, Vol. iv, pp. 25,26. 



