330 



JSfOliTll AMERICAN BIRDS. 



1**9 



cult genus, we are indebted to a recent monograph by Dr. Coues, in the 



l'rocoeding.s of the 

 ~zr:^^r~^'^ ~i IMiihidelphia Acad- 



emy, for June and 

 July, 1872 (pp. 56- 

 81). With the same 

 material for our in- 

 vestigations, we have 

 been led, after a very 

 careful perusal of the 

 valuable pajier men- 

 tioned, and tedious 

 critical comi)arison 

 of the large material 

 at our command, to 

 adopt a somewhat 



M!,iarc/,us mericam,.,. difficult vlcW of tllC 



relationship of the forms characterized. The following synopsis expresses 

 their affinity as at present understood : — 



Co.MMON Characters. Above olivaceous, usually uniform, sometimes darker, 

 sometimes more ashy, on the head above. Head and jngulum more or less a.^hy, 

 though the latter is soinetimes very pale. Rest of lower parts sul])hin'-yello\v, 

 sometimes almost or quite white. Primaries, secondaries, and rectrices usually 

 more or less edged on either web with rufous ; but sometimes entirely destitute 

 of this color. 



Species and Varieties. 



A. Bill sub-conical ; sometimes nearly terete, its depth equal to, or exceeding, 

 its breadth in the middle portion ; its lateral outlines moderately divergent 

 basally ; terminal hook abrupt, strong. (Myiona.r.) 



1. M. tyrannuluB. No trace of rufous edgings on either wings or tail. 

 Above ashy-olive, the pileuni similar, the outer webs of wing-covertvS and 

 secondaries edged with whiti.-ih. Head, laterally and beneath, ashy, the 

 throat and juguhnn more wliiti.-<h rest of lower parts suli)liur-yellow. 

 Tail slightly rounded. 



Pileum uul nape umber-brown ; upper surface umber-grayish. Bill 

 dark brown. Wing. 3.riO-3.70; tail, 3.C0-3.90; culmen, .90 - .95 ; 

 tarsus, .80 - .90. Ilab. South and Central America, from Bolivia and 



Southern Br.azil to Costa Rica var. lyra until us} 



Whole head and neck pure ash, paler on the throat, and darker on tlie 

 pileuni; upper surface greenish-ash. Bill black. Wing, 3.70 ; tail, 4.00; 

 culmen, .82 ; tarsus, .91. Ilab. Ecuador and Guayaquil. 



var. p h uenc cphalu n .' 



' ^^!linrclnl.1 It/rntiii kIiii {},Uiu,.), Coites. Miuicicnpa tyranvvlii.s, MCli,. (G. R. Oit. Hand List, 

 No. 5,.')27). .Uijinrchns t. CoUEs, I'. A. N. S. Phila. July, 1872, 71. {M. aurora, Riinn. ; fluri- 

 vcniri.i, .SiEl'H. ; firo.r, G.M. ; su-niii.iovi, OAnAS. ; pnnamciisis, Lawii. ; vcnr.zueli'n.'tis, Lawr.) 



' ifi/iarchun li/rminvlux, var. pJiirncfplmlus (Sclatkh). Mi/inrc/ius }>k(aKep/uilus, S(.'i,. P. Z. S. 

 1860, 481. — CouK,s, P. A. N. S. 1872, 73. 



