FALCOXI D.E - Til K FA ICONS. 283 



Sp. Ciiah. Adult, rppci- paits lirli lilii(jkisli-l)ro\vii, a|)proacliinK black (ui the back; 

 scnpulai's mill initldle \vinj;-fovci-ts <,.i|.;t.tl and l)an-(Ml bciioatli ilir siiifacc with dull white, 

 and li!i,i.'c(l alon-- cili^^.s wilh (icliraccoiis. Winys -.'(.iici-nlly of a paler shade than the 

 back; secondaries liidiiiLr iiiln nearly wliito at lips, and, with the f,nvatei' coverts, ob.senrely 

 baiTcd with .laik.T : primaries nearly black, tip.s edged with pale brown, this pa.ssi:if,' into 

 whitish. Piunip unilbrni iila.ki.-li-brown, leathers obscin'ely liorderi'd with rnsty. Tpjier 

 tnil-covcrts ochraceons-while, nearly pure tenuiually, and with about two distinet 

 transverse bars of deep lulbus. Tail rieli luiirorni laliM-il.ious-rulbus, passing narrowly 

 into while at tin; tip, and about an inch (or less; from the end crossed by a narrow liand 

 of black. Head and neck with the lisuhers medially blackish-lirown, their edges rn.sty- 

 rufoiis, c-msing a streaked appearance; the rufous prevailing on the sides of tla.' occiimt, 

 the ear-coverts, and neck. The blackish almost nnitbrm on the forehead and on the 

 cheeks, over which it forms a broad •■mustache"; lores and sides of frontlet whitish. 

 Throat white, with broad .stripe.- of purc^ slaly-l,rown ; lower parts in general ocln'aceous- 

 white; tibiie and lower tail-coverts innnaeulate; across the alidomen and Hanks (immu- 

 diately in front of the tiliiic) is a broad inlerrupted belt, of longitudinal black blotches, 

 tho.sc on the abdomen toar-shaiied, on the Hanks larger anil more irregular, throwing off 

 bars toward the eilge (.f the feath(-rs; whole pectoral area variegated only with a few 

 shnft-.stiraks of black (thes(i growing broader lal<>rally), and sometimes washed with 

 ru.sty. Lining of the wing ochraceous-white, with sjmrse diamond-.sli.aped .sjiots of palo 

 rufous, and shalt-strcaks of diU'ker ; under surf.ice of i)rhiiaries white anterior to their 

 emargination, beyond which they gnidually deepen into black ; the innermost ones are 

 finely mottled with slaty, and with imperfect tr'nnsverse bars of the sr.me. 



iMe. Wing, 13.50- Ui.,')0; tail, .S.oO- iD.oo ; eulnuMi, .!)'>- 1.08; tarsus, 1.40-3.20; 

 middle tne, l.GO- 1.70. Weight, 2 J - .'5 Ib.s. 



Female. Wing, l.'').2r)- 17.75; tail, O.oO-lO.oO ; culmen, 1.00-1.15; tar.^us, 3.15-3.40; 

 middle" toe, 1,70 - 1.80. Weight, 3 - 4 lbs. 



YoiuHj (28,154, I'hiladelphia; T. Krider). Above similar to the adult, but lacking 

 entirely any rufous tinge, the scapulars and wing-coverts more vaiiegated with whitish. 

 Tail light grayish-brown (very much lighter than the rump), tinged, especially b.asally, 

 with rufous, narrowly tipiied with white, and crossed with nine; or ten narrow, curved 

 bands of black ; uppci- tail-covci-ts white, with broad bars of black. Ilc'ad as in the 

 adult, but the rufous wanting, leaving the streaks black and while; forehead more broadiv 

 white; chin and throat wholly white, the latter with a collar of duskj' streaks ,'icross the 

 lower part ; whole pectoral region entirely immaculate, pure white ; abdominal band as 

 in the adult; tibiic .somewhat tinged with ochraceous, tmvariegatcd. 



IlAii. Eastern North Ameri(fa ; not in West Indies, nor west of the Mis.souri. 



Localities: (?) Bahamas (Bkvant, Pr. Bost, Soc, 1807, 04). 



LIST OF SPECIMRNS EX.A.MINED. 



National Museum, 9; Philadelphia Academy, 13; Boston Society, 8; Museum, Cam- 

 bridge, 15; Cab. a. N. Lawrence, 3; Coll. R. Ridgw.ay, 2. Total, 50. 



The true Butco horcalis, as restricted, may always be distingui.slied from 

 the var. mlnrvn, its western representative, by its liaving the posterior lower 

 parts (tibiiv, and lower tail-ooverts) entirely tree from transverse l>ars, and 

 by laekino indications of transverse bars on the tail, anterior to the con- 

 spicuous subtermiual one. It differs from the var. costarirensk, in liavinjjr 

 the head and neck conspicuously striped with rufous, and the tliroat tbicklv 

 striped witli black, almost obliteratin<>- the white ; in the conspicuous tibdom- 



