302 FIELD MUSEUM OF NATURAL HISTORY ORNITHOLOGY, VOL. I. 



Middle tail feathers bronzy green, with narrow white tips and a sub- 

 terminal dusky area; the four outer tail feathers bronzy green on basal 

 portion for more than half their length and very broadly tipped with 

 white, the bronze green being separated from the white ends by an area 

 of bluish black; tail long and very strongly graduated (much more so 

 than in T. leucurus) ; upper mandible black ; lower mandible pale, the 

 terminal part black. 



Wing, 48; tail, 48; middle pair, 48; outer feather, 26; bill, 26 mm. 



This new species has a superficial resemblance to Threnetes leucurus, 

 but the very different tail alone will distinguish it at a glance. Indeed 

 the extremely graduated and differently marked tail and other charac- 

 ters, which will be discussed in a later paper, make it not unlikely that 

 it may be found worthy of generic rank. 



