FALCOXID.E — THE FALCONS. 243 



Adii!t male. Tail lijjlit ash, tipped witli white, and crossed by three or 

 four nearly coiUinuous narrow bands of black (extending over both 

 webs, and crossing the shaft), anterior to the broad subterminal zone, 

 the black of which does not run forward along the edge of the feathers. 

 Inner web of longest primary with seven to nine transverse spots of 

 white. Streaks on the cheeks sparse and fine, not condensed into a 

 "mustache." Pectoral markings broad clear brown. Ochraceous wash 

 weak across the nape and breast, and along sides, and very deep on the 

 tibiiB. Adult female. Above plumbeous-umber, without rusty margins 

 to the feathers, and without conspicuous black shaft-streaks. Tail with 

 only five (one concealed) narrow bands of pale ochraceous ; outer webs 

 of primaries without ochraceous spots ; inner web of outer primary 

 with eight spots of white. Youncj. Like the adult female, but darker. 

 Wing, 7.90-8.25; tail, 5.15-5.25; tarsus, 1.00; middle toe, 1.25. 

 Hah. Entire continent of North America ; West Indies. 



var. c lumbar iti .5 

 6. Adult male not bluish ? sexes similar ? upper parts with lighter trans- 

 verse spots. 



Adult. Above light grayish-umber, or earth-brown, with more or less 

 distinct lighter transverse spots : secondaries crossed by three bands of 

 ochraceous .spots, and outer webs of inner primaries usually with spots 

 of the same. Tail invariably with six complete and continuous narrow 

 bands of dull white. Beneath white, witli broad longitudinal markings 

 of liglit brown, these finer and hair-like on the tibiic and cheeks, 

 where they are sparse and scattered, not forming a " mustaclie." Toj) 

 of the head much lighter than the back. Young. Similar, but much 

 tinged with rusty above, all the white portir>ns inclining to pale ochra- 

 ceous. Wing, 7.70-9.00; tail, 5.00-6.30; culmen, ..50- .60 ; tarsus, 

 1.40-1.65; middle toe, 1.20-1.51. Second and third quills longest ; 

 first equal to fourth, slightly shorter, or sometimes slightly longer. 

 ffab. Interior plains of North America, between the Mississippi River 

 and the Rocky Mountains, from the Arctic regions to Texas. 



var. (?) richa r dsoni. 

 c. Adult male not bluish ? sexes similar ? upper parts without transverse 

 spots, and tail without lighter bands, except at the tip. 



Above plain brownish-black ; the tail narrowly tipped with whitish, 

 but without other markings; inner webs of the primaries without 

 lighter spots. Beneath pale ochraceous broadly striped with sooty- 

 black. Wing, 7.35-8.50; tail, 5.25-5.75; culraen, .50 -.55; tarsu.-;, 

 1.30-1. 02; middle toe, 1.25-1.35. Hab. Northwest coast region 

 from Oregon to Sitka ........ var. sjickleyi. 



Falco envrillus, S.wigxt, Descr. Egj^it, Ft. I, 1809, 100. Falco sibiricus, Shaw, Zool. VII, 

 1812, 20". Falco ausius, Meter, Tasch. deutsch. Vog. I, 1810. Falco subcesalun, Br.EUM, 

 Vog. Deutsch. I, 1831, 67. 



Hab. Europe and Western Asia ; Iceland. 



List of Specimeiis examined. — National JIuseuui, 8 ; Boston Society, 4 ; C'anibridgo Museum, 

 3 ; New York iluseum, 2 ; Philadelphia Academy, 3. Total, 20. 



Mcamrcmcnts. — $. Wing, 7.60-8.00; tail, 5.10-5.30; culmon, .45 -.50; tarsus, 1.35- 

 1.45; middle toe, 1.15 : specimens, 10. ?. Wing, 8.60 - 9.00 ; tail, 6.00-6.30; culmen, 

 .52-. 55 ; tarsus, 1.45-1.47 ; middle toe, 1.20-1.25 : specimens, 10. 



