BASILEUTERUS. 



24T 



at base and the tail shorter, so that the outstretched legs reach to 

 or beyond the tip. The wings are more pointed. The colors be- 

 neath are quite similar, not so pale along the median line ; the upper 

 parts, however, much darker, tlie head lacks the blackish, and the 

 fulvous of rump and basal half of tail are wanting in dragulatiis. 



Idiotes, Baird. 



Idiotes, Baikd. (See page 237.) (Type Setophaga riijifrons, Sw.) 



Bill broad at base, but quite deep, being nearly as lugb as wide ; the culmen 

 curved gently from the base, the lateral outlines straight ; the bristles only 

 moderate, reaching half way from nostrils to tip of bilT. Tail lengthened, 

 longer than the short wings, and considerably graduated ; the 4tli quill 

 longest ; the 1st not longer than the 9th. Toes rather lengthened. 



The species of this group have generally been placed in Basi- 

 leuterus. They, however, differ in having the bill narrower at base, 

 and proportionally deeper, the bristles less developed, although the 

 culraen is as much curved. The wings are much shorter, and the 

 tail proportionally longer and more rounded, considerably exceeding 

 the tail instead of being about equal to it. The transition, how- 

 ever, is quite gradual through B. belli and I. mesochri/sics, which, to 

 some extent, combines the characters of both. 



Synopsis of Species of Idiotes. 

 Back olive ; top of head chestnut (bordered with dusky in belli). 

 Cheeks black. 



A white superciliary stripe. Beneath whitish . melanogenys. 



Cheeks chestnut ; lores dusky. A superciliary stripe, and 

 another beneath eye, white. Throat and breast yellow. 

 Rest of under parts white, or only washed with 



yellowish ........ rufifrons. 



Entire under parts yellow ; crissum more fulvous. 

 White infra-ocular stripe reaching behind ears. 

 Chestnut of crown reaching the nape. Wings 

 equal to lateral tail feather .... delattrii. 



Under parts and crissum yellow. Infra-ocular white 

 not extending beyond eye. Chestnut of crown 



