FALCON I I)/K— TriR FALCOXS. 



231 



Haino nmount, rixthor prodominatiiif; on llio liliin\ Wing, 10.70 ; tail, 0.00; Inrsua, 2.45 ; 

 iiiiiMlf Idc, l.HO. lA)iiilli luid fiflli iiiiills loiif.'t'st niiii ('(111111; third lonitcr than sixtli ; 

 scroiul iiilcniKMliiilc liclwccn .sixlii and scvciilli; liisl tliicc iiiclics sIkhIit than Idiificst. 



YouHij male (.V),.HiM, Vnvl .Nfin'oii, N. C, Fobniary ; Di'. Coiius). Abovi; jfrayisli- 

 nniber; rcalhcrs ol' Ibrchrad, crown, and nape liiinlly I'dgi'd laterally with pah- 

 rusty ; oc(.'i|)iit unvaried blackish, fcatheis white beneath the sin I'aee. Wing-eoverts. 

 scapulars, and interscapidais narrowly bordered with ]piile yellowi.sh-iiniber; rmnp and 

 upper tail-coverts bordered with rusty. Tail paler nniber than tlie back, niirrowly tipjied 

 witli white, and crossed by four bunds of brownish-black, the lirst of which is only par- 

 tially concealed. Scapulars and upper tail-coverts showiiif; inucli concealed white, in 

 form of roundish spots, on lioth webs. Itenealh clear white, without any yellowish tinuc; 

 throat with a medial and lateral series of clear dark-brown streaks; jii}riiliini, breast, sides, 

 flanks, and alidomeii with numerous stripes of clear sepia, each sliowiii},' n darker shaft- 

 streak; tibiii! with longitudinal streaks of paler and more rusty brown; lower tail-eovert.s 

 immaculate. 



Young female (0,870 "Sacramento Valley, Cal." ; Dr. Ilcernumn — pn.liably from I'enn- 

 sylvaiiia). Similar to young male ; more varied, however. The black middle streaks of 

 feathers of head above narrower, causing more conspicuous streaks; white spots of 

 sca])ular region considerably e.\])osed ; loiig'.udinal stripe beneath narrower and nion; 

 sparse. 



II.\n. North America in general, but rare in. the western division; Eastern Mexico. 

 Not found in West Indies, where replaced liy .1. gniidUtchi, Lawk. 



Localities: Southeastern Te.xas (Duksskh, Ibi.s, 1865, 323, breeds); Arizona (Coues, 

 Prod. 1800, 43) ; Costa Rica (L.vwh. IX, i;j4). 



LIST OF SPECIMENS EXAMINED. 



National Museum, 12; Philadelphia Academy, 10; New York Museum, 3 ; Boston 

 Society, 2 ; Cambridge Museum, 1 ; Cab. G. N. Lawrence, 7 ; Coll. R. Ridgway, 4 ; 

 Museum, W. S. Brewer, 1. Total, 40. 



Var. mexIcanuB, Swainsom. 



MEXICAN BLUE-BACKED HAWK. 



Jccipiter mexicamus, Swaixs. F. Bor.-Am. II, 1831, 45. — .Tarp. (cd. Wils.) Am. Orii. II, 

 1832, 215. — IJoNAT. Consp. 32 (under A. fuscu^). — Oass. B. Cnl. & Tex. 9ti. — In. V. 

 A. N. .S. 1855, 279 ; Birds N. Aiu. 1858, 17. — Coop. & Si-cKi,. P. 11. H. Kept, VII, ii, 

 18G0, 140. — CouEs, P. A. N. S. Pliilad. 1866, 18. — Gkay, Hand List, 1, 1809, 33. 



AduU male (12,024, Fort Tejon, Cal. ; .1. Xantus). Forehead, crown, and occiput 

 plumbeous-lilack, feathers of the latter with basal two-thirds snowy-white, partially 

 exposed. Upper plumage deep phmibeous, darkest anteriorly, the back being .scarcely 

 lighter than the nape ; rump fine bliiish-pluinl)eous. No concealed white on the upper 

 part.s. Tail brownish-])lumbeous, narrowly tipped with pure white, and with four .sharjily 

 delined broad bands of black, — the first of which is faintest, and concealed by the coverts, 

 the last broadest ; shafts of tail-featliers deep brown throughout. Primaries and sccon- 



