rALCONID.K — TIIK l"AI,('(»NS. HI 



.srt/r/', Sclile;,', fGniy's Hiiiul List, No. 17(!), soems, to jiulj,'u from the di'scrii)- 

 tious uuil ligmv.s wliidi 1 liavo st'cii, to bo also muivly a form of the atuuu 

 species, but I liavo seen no siiceiniens of it. 



Faloo (Hierofalco) gyrfalco, Lixn. 



Viir. caiiillcnns, (Imrum. 



WHITE OEBFALCON. 



Accijtikr faho frcti hiidmnis, Hills. Oiii. I, S'lO, 17i>:}. ^l. Ol/r/ulm, Biuss. Orii. I, 370, 

 1>1. x.x.x, 1'. 2, 1703. Fatal riisliculus, F.vuii. Faun. (irnMi. p. 55, 1780. — h\n\. Syn. 

 Siipp. I, 15, 1781. F. ciiiidkitim, (Imki,. Syst. Nut. i>. '27.">, 1788. — DAflt. Tr. Oiii. 

 II 101, 1800. _ Br.NicK, Isis, 18'J4, S8-2. — Scill.Kd. Kiit. riicis. p. 1, ISII. — 

 UoN.M-. licv. Zool. 1850, 184 ; Colisi). Av. p. 33. — C.vssis, I'loo. Ac. Nut. Sc. I'liil. 

 1855, -278; lliiiln N.Am. 1858, 13. — Stkicki,, Oni. Syii. I, 77, 1S55. — HL-v-sri-.i, 

 Cull. .lour. 18(J2, 43 (tliiukH all bomil oiii's huiik! in Kuro|i« ami Ainciica). — Kllki'I', 

 Hiiils N. Am. pi. xii. llii'iv/ulm ciiiidicniin, (.'rv, licg. An. I'll. 1, I, 312, 1817 ; od. 2, I, 

 323, 1829. — I.Kss. Man. Oin. I, 80, 1828 ; Tr. Oin. p. 97, \'\. .wi, p. 2. — (ilt.w, llan.l 

 List I, 18, ISm). F(i/ni Isldiitliciis, L.vill. Inil. Orn. p. 32, 1700; .Syn. I, 71, A, H; 

 OtMi. Hist. I, 72, A, 1821. — .SiKl-ll. Zool. Xfll, pt. ii, p 39, 182ti. (!iiii.l>, I!. Kur. 

 pi. xi.\. — Auk. IJirils Am. 1831, pi. ecclxvi. F. huleo (i, l,.\rii. Inil. Urn. p. 24, 1790 ; 

 Gen. Hi.st. I, 80, A. F. /tKjojiux, ji, L.vril. Inil. Orn. p. 10, 1790 ; .Syn. Supp. I, 30 ; 

 Cicn. Hi.st. I, 08, A. /'. iji-ii-iiliiiulkiii, ]).\v\\ Tr. Orn. II, 157, 1800. J/icm/a/co 

 gmii/andicun, Biu'.iiM. Voy. Deutsuli, I, 10, 1831. /'. yyrfuico, BoSAi'. List, p. 4, 

 1833. 



Sp. Cii.Mt. Adiitt (9, 18,-")77, Groenlnnil ; I'liiv. Zool. Miis. Copoiilin<;on). Ground- 

 color untirt'ly pure white; \v1k)1l> upper .surface (|i()Sterior to the nape) willi (ran.sverse 

 cre.seentie har.s of dark plunilieous-browu, frenerally ahout two on eaeii featiier, the lirst 

 concealed by the fe.ither wliieli overlaps. Primaries cro.ssod at reij;ular intervals with 

 tpiadrate spots of the same tint, liieso becoming fused toward ends of quills, forniinfj; n 

 terminal dusky space (,f two or throe inches in extent ; ti|)s of all the (piiils -'arrowly 

 white; the black bars do not extend quite to the primary eoverts, and decrease both in 

 extent and ropjuliu'ity toward the im.se. Middle tail-feathers eros-sed witii seven or eiijht 

 imperfect bars of dusky, the .shafts of tin' featlijr" blackish ; rest of tail innnaculate. the 

 .shafts ])ure white. Nape with a very few lino shai'-streaks of dusky. Whole lower sur- 

 face of body and wing utterly immaoulato. Wi.ig-fornnda. 2-3-1. Wiiiir, Ki.oO; 

 tail, 0.00; culnieu, 1.0.'); tarsus, 2.10-1.35; middle toe, 2.20; inner, l..')0; outer, L.'JO; 

 posterior, 1.00. 



(No. f)(),ir)2, 9) Greenland; RchliKer Colloction.) Head .above, occiput, nape, and 

 upper half of ear-coverts, with spaise shaft-strciiks of black, these most numerous on the 

 latter region; primaries barred to the coverts. Tail enlirely crossed by eleven phun- 

 beou.s bars. B.irs above clearer plumbeous. The .uowy-white beneath is rclii'vcd by a 

 few minute variable Hecks of dusky upon the lower \,m-\ of th.' ;didomcn, becoming larger 

 as they approach the sides. Wing-i'ormula, 2-3 - 1. Wing, 1(\70; tail, !).30. 



Jnv. trausitiou Mtirjc? ( ^f, 50,0-1:7, " Holier Xorden " ; .'sc'diiicr Collection). Markings 

 above quite different from those of the two preceding; each feather h.ns a large central 

 longitudinal sagittate spot of dusky, leaving only the borders (of the expose<l portion) 

 white; on the primaries the dusky is almost conlincd to the terminal portion ; the rump 

 and upper tail-coverts have e.ich feathers with n medial longitudinal stripe of dusky. The 

 tail is imm.ieulatc, but. the shafts of the middle feathers are dusky. The neck, bre.'ist, ab- 



