124 



NORTH AMHHirAN BUWH. 



Jin: (^,32,207, Sonth F..il< nl'lli,. I'latt.' Uivor, July 1!), IS.iM; ('. S. M.Caillu), 

 Above ilnikiT iiiiibur than the lasi, cacli Icallicr .listinclly boidori-d tiTiiiiiially with nisiv- 

 ochrac'i'ous. JJciiciilli willi a il<r|HT umiiii-ciildi-cd tiu^'c, slvcaks Mntkcr; lliiiik-imlrli 

 liiorc! coiispiciiiiiis and iiiiilbriii ; axillais uiivaiif^atcd dusky. Winj,'-luiiinda, 2, ;! - I — . I. 

 Wiii{f, 13.2.') ; tail, ".25, 



IIaii. WcvsttTii division of Xortli Anicripa, oasfwanl to Illinois; Orcfron to Lowit 

 California, and Texas. Localities : Texas, San Antonio and Eat,de I'ass (Dukssku) ; 

 Ariiioiia (Couks). 



Tho ilifl'crcnt staocs of i)himago are in this by no means wo well ilofined 

 as in other spocios, tlieie liuinj,' nearly tlie same -funeral apiieariiiice in all. 

 There is, also, very little variation in dillerent specimens of the same a^e. 

 No. 8,004, (9, Dalles, Oregon ; Dr. Georoo Siickley) has the hlaek markings 

 on the sides of the lireast more circular, and the vandykc-hlack of the 

 u.xillars with a few circtdar white spots on the edges of the feathers. Wing, 

 14.00 ; tail, 8.40. Nt)s. 17,'J04 ( 9 , San Jos6, Lower California ; John Xantiis, 

 January, 18(30) and 18,258 (,J ? Fort Ihichanan, X. M.) have the u])per 

 surface almost perfectly continuous grayish-drab, the first absolutely un- 

 variegated by markings, though the feathers fade a little on edges, lieneath, 

 tho white is very pure ; the streaks are numerous, sharply defined and 

 longitudinal. Wing, IS.lT) ; tail, 7.')0 (17,204). 



The American Lanner Falcon is so very closely related to the Lanncrs of 

 Europe and Asia (var. lanarius and var. Jiii/i/cr) that it is very dilUcult to 



indicate the difl'erences wliich 

 separate them. Tho two Old 

 World forms above named are 

 more uidike each other than 

 they are from the two Ameri- 

 can races ; the var. Jinjijcr differ- 

 ing from nuwicanus apparently 

 only in larger size ; and tiie var. 

 lanarius, more like ^'o/i/cii/rus 

 than it is like either ji(i/ffcr or 

 mexicanus, differs from j^oly- 

 agrus mainly in the greater 

 amount of white on the plu- 

 mage, this imparting a lighter 

 asjiect to the pileum, and caus- 

 ing a greater develoi)ment of 

 the light spots on the outer 

 webs of the primaries and 

 rectrices. 



The xax: jjoh/afirufi, compared 



with var. lanarinH, is much 



darker, having, at all ages, the crown uniformly brown, with darker streaks, 



instead of having these streaks upon a white ground. The " mustache " is 



Fnlco polyn^us- 



