FALCONID.E — Till: FALCONS. 

 Meus'n-emeiil.i, 



277 



Sex. 



9 



IV 



ll.-2:>- I3.f)() 

 1 :!.:!.">- 14.1'.') 



Tail. 

 8.(10- i).70 



!).()(»- 10.00 



Culmen. 



Titrmts. 



:i.70-;5.2.") 

 3.10-:5.:iO 



MiildU Toe. S/terimens. 



1.30- 1.50 20 Xoitlieru.! 



This siieciiiion may possilily iniliciito a mere individual variation, rather 

 than a pro^^ressivc .staj^e of pbiniage. 



A male (25,108, Wasliiiigton, 1). ('., Fel)ruary) is as stronifly ])arred he- 

 neath as described in the female ; thus it would appear that any diilerences 

 iu ]>luniage in the sexes are nothing more than individual discrepaucics. 



The yellowisli outer webs of tlie primaries constitute a feature which will 

 serve to distinguish the young of the liuko lincatus from that of every 

 other Nortli American sjjccies. 



A series of twelve specimens from Florida, in the Aluseum of Compara- 

 tive Zoology, at Cambridge, shows that the birds of this species from that 

 peninsxila are \ery much smaller than northern ones ; and though that of 

 tiie adults does not diH'er ap])reciably, the plumage of the young birds is 

 consideralily darker than in northern specimens, and occasionally approaches 

 fpiite nearly to tliat of the young of var. cicriuna, the markings on the lower 

 parts, including the til)ia^ lieing often in the form of transverse spots. 



The extreme measurements of this series are as follows: Wing, 10.90- 

 12.75; tail, 7.70-8.,-)O; culmen, .80 -.90; tarsus, 2.90-3.20; middle toe, 

 1.25 - 1.45. Spechueus, 12. 



Var. elegnng, Cassin. 



BED-BELLIED HAWK. 



Biiteo dcrjans, Cass. P. A. N. S. ISof), 281. — In. B. X. Am. 18,58, 28, plate. — Hefrm. 

 P. R. Roj). II, 32. - Kknnf.hi.y, P. II. Rop. Ill, 19. — Niavn. VII, 75. -Coor. & 

 SrcKi,. XII, ii, 147. -Stuicki.. Oin. Syii. 1, 38. - ? Diiks.sku, Ibis, 1865, 325 

 (Texas'). —t'oi-Ks, P. A. N. S. 1866, 9 (Arizona). -Okay, Hainl List, 1, 7. — Coopkk, 

 Birds Cal. 1870, 477. 



Sp. Citah. Adult mnh (lO,;".^, Ft. Tejon, Californi.i, " Ont. 22, l.?")7"; J. X.intus). 

 Iload. iK'ck, interscapulai-.'!, .iiitcridr .«cnpular.<!, lessor wiiifT-povcrt.s, lininpr of tlio wiiiir, 

 and ontirc lower ])art.s, dark latoritioii.>;-nifi)ns, iii:'liii''if!' to cliesfnnt on the .slionlders. 

 The npjier parts so coIoi'cmI have e.ach feathers with a medial-ovate spa ^e of dull blank, 

 ffivinpr a striped apjiearanee : the lesser winfr-eovcrts, however, have eaeh only a narrow 

 shaft-line of black, these prowinn; larirer .as they approaeh the middle eoverts. There is a 

 sti-ono' black snfTusion over the cheeks, rorminjr an obsnuro "mustaeho"; orbit blackish, 

 throat streaked with the same. Tiie dark lateritions-rul'oMS of tlu; jnjruhim and breast is 

 perfectly contiinioiis and nniforni, \ari("(l only l)y the ob.soletely darker shafts of the 

 feathers; sides and flanks transversely barnvl wilii white; lininir "f the winjr. atid tibiie 

 with very ill-('efined liars of paler nifons; anal rcfrion and lower tail-covrrts with broader 

 and more sharply defined bars of the same. Scapnlars and middle winjr-coverts brownish- 

 black, narrowly tipped, and irregularly spotted transversely, with pure white; .secondaries 



