FALCONIDvE — THE FALCONS. 131 



cnliTion, .4") - .")S; tarsus, 1.20 - I.'jG ; iiiiilillo too, 1.15 - 1,40. Sw;onil 

 (luill l()iij,'<'st; liist loiinci- tliaii third, t'ri.sstini aiiilbrin (Iccj) rcMldish- 

 ruroii.-f, rarrly liarroil with wliiti' lunl dusky. L'lUK'r Uiil-covcrls 

 obsoli'toly liaiTcd willi pluiiilxMiiis. 



Adiill. Aliov(^ |iliiiiilii'Oiis-l)l;u'k, tlu! luiithcrs lighUniiiii; into pliuulicous- 

 bliic oil llio L'djjos and ends, and sliowini; oliscnru liars on tlio poslorinr 

 portion.s. Throat ami jngiiiuni ochrai'cons-whitc, tho ocin-aeoons tingo 

 deepest po.steriorly and without any streaivs. YuitiKj. Aliove phnn- 

 beons-hlack, wilhcint iiniilcr olisciu'e li.iis, or wiih a brownish cast, and 

 with I'aint i'usty edges to tlie leathers. Tiu'oat and jngnlnni deep sol't 



jcetioii over the du-cks, wliirli aw. |iincr lihu-k. All tho leathers above darker centrally, but the 

 ohseuro .spots so formed inastly coneealej ; shafts of the feathers iiieoiis|iieuously black ; upper 

 tail-coverts each with two broad transverse .spots of black. Secondaries, [iriniary coverts, and 

 primaries uniform dull black ; the former, and inner feathers of the latter, very narrowly ashy- 

 whitish on terminal border, — the coverts with a bluish shade tenninallj'. Tail black (dull light 

 brown at apical margin), cro.ssed with about si.x obsolete iiarrow bands of phnnbeou.s, these 

 changing to narrower white bars on the iinier webs. Chin, base of nia.Kilke, throat, sides of the 

 neck, and jugulum, otdiraceous-white, the ochraceous tiliL'c deepest posteiiorly ; breast (broadly 

 across) and sides black, with mnnerous narrow transver.M^ bars of reddish-white, becoming more 

 ashy posteriorly ; abdomen, anal region, tibia', fcmorals, and lower tail-cov<'rts uniform dec]), 

 almost ca.staneous, rufous. Lining of the wing dull black, with circular ochraccous-white spots, 

 but former predominating ; whole under surface of primaries and secondaries a similar blackish- 

 dusky, the former with narrow transverse elliptical .spots of white, of which there an^ eight (the 

 fust and last menly indicated) on the longest (piill. AViiig-fornnda, 2-1-3. Wing, 7.7'!; 

 tail, 3.9,') ; tarsus, ].20 ; middle toe, 1.20. Tail slightly eniarginated ; .second aiul third feathers 

 longest (counting from e.vterior). 



9 (5.218, Slazatlan ; Colonel Gray.son). Almost preei.scly similar to the male ; less contrast 

 between blacki.sh-plunibeous of the nape, and moic bluish of the back ; bands on tail five in 

 number; bars on black beneath nwre reddish. Wing-fonnula .same. Wing, 8.80; tail, 4.40; 

 tarsus, 1.30 ; noddle toe, 1.30. 



Jhv. (liryant Coll. 1,.')31, Ori/aba, Mex.). Above continuous dull black, without bluish ca.st 

 or concealed si)ots ; tail-bamls narrower, purer whit(^ ; black beneath iluller, transverse bars 

 more obsolete, broader, and pale rusty ; chestnut-rufous of posterior lower (lortions lighter and 

 less uniform ; lower tail-coverts with broad transverse spots of plumbeous-black. Wing-formula 

 as in adult. Wing, 8.7,5 ; tail, 4.40. 



Two young males from Tehuantepee, Mexico (\os. 613 and 613, May 16, 1871 ; I''. Sumichrast), 

 dill'er from that described above in .some remarkable resjiects : the upper parts are in one black, 

 but without the rusty margins to the feathers ; in the other, almost exactly as in the adult plu- 

 mage desmibcd. The lower parts, however, are most ditlerent ; the throat and jugular are uniform 

 deep soft ochraceou.s, with a few longitudinal streaks of black near the black abdominal patidi ; 

 the bars in this la.st are deep rufous, and the terndnal baml of the tail is also dee)) rufous. The 

 weak bill, and soft, bh'nded character of the [ilumagc, indicate unmistakably the very young 

 age of these specimens, which are also luarkeil " very young " by JI. Sumichrast. 



In colons, as well as in .size and form, this very handsome little Falcon closely resend)les the 

 F. sevcrus, ITorsf., of Manilla and the neighboring Kast Indian I.slands ; the main dilfercnce is 

 that in that species tlu; lower smface is wholly deep rufous, iustrad of partly black. 



Lid of Si>cci>nciis e.i'(tiiiiiti;t. — National Mu.scum, 1] ; lloston Society, (I; Philadelphia 

 Academy, 7 ; X<'W York Museum, 3 ; O. N. Lawrence, 3 ; U. Ridgway, 2. Total, 32. 



Mmsuiviiu'iu.i. — $. Wing, 7.20-8.80; tail, ■4.20-.5.1O; eulmen, .4;')-,.'').-); tar.su.s, 1.25- 

 1.50; middle toe, 1.15-1.30. Specimens, 13. 9. Wing, 8.50-0.00; tail, 5.00-5.50; 

 eulmen, .58 ; tarsu.s, 1.48-1.55 ; middle toe, 1.30-1.40. Specimens, 8. 



IIau. Tropical Anu'rica, northward thiough Central America anl SIt;xicu almost to southern 

 border of United States. 



Localities: Vcraguu, Set,, k Sai.v. 18G9, 252. 



