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Mr. R. Ridgway on the Genus Empidonax. 461 
distinct species which I have been able to examine, viz. E.fus- 
catus (Max.), E. fringillaris , Pelz., and a very strongly- 
marked species from Tobago, which Mr. Lawrence has doubt¬ 
fully determined as E. oliva (Bodd.). These three species 
differ as follows :— 
a 1 . Upper parts umber-brown, the wing-bands ochraceous 
or rusty. 
b l . Lower mandible with basal half light-coloured 
(whitish in dried shins). Wing 2'70-2‘90, tail 
2'75-2-85, exposed culmen *48-'52, tarsus *70.— 
Hab. Southern Brazil . E. fuscatus. 
b'\ Lower mandible entirely dusky ; plumage darker 
throughout. Wing 2*85, tail 2*85, exposed cul¬ 
men *50, tarsus ‘70.— Hab. Eastern Brazil (Bahia) E. fringillaris. 
a 1 . Upper parts greyish brown, the wing-bands greyish 
buff, or isabelle colour. 
b 3 . Lower mandible entirely dusky. Wing 2'75, tail 
2*80, exposed culmen '55, tarsus '72.— Hab. 
Tobago. E. oliva P 
Should the Tobago bird prove distinct, I propose for it the 
name Empidochanes vireoninus, the general appearance of 
the bird suggesting a rather large “ Vireosylvia ,} with 
distinct wing-bands. Regarding the identification of the 
Muscicapa oliva of Boddaert with either of the three 
species characterized above, I have only to remark that 
the figure (PI. Enl. 574. fig. 2) upon which it is based presents 
not the least resemblance to either of them, so far as I 
am able to see. 
4 
XLIII.— On the Species of the Genus Empidonax. 
By Robert Ridgway. 
From the genus Empidonax I would remove the following 
species:—(1) E. atriceps, Salv., which seems to me much 
closer to Mitrephanes , if not strictly congeneric with M. 
phaocercus and M. aurantiiventris; and (2) E. nanus , Lawr., 
which I have made the type of a new genus (. Lawrenceia ), 
characterized in the July f Auk/ p. 382. 
On the other hand, I would add to the genus Mitrephanes 
fulvifrons (Scl.), which, so far as I can see, differs from the 
