FALCOXID.E — DIVKNAL RAFTORES. 443 



B. Wing more than 20 inches: inner wobsuf outer six primaries distinctly emarginated. 

 a'. Tarsus densely feathered, all round, to the base of the toes. 



12. Aquila. Nostril narrowly oval, obliquely vertical, A very distinct web 

 between middle and outer toes. Feathers of the nape distinctly lanceo- 

 late. 

 a-. Tarsus with lower part naked. 



!/'. Tail short, much less than two thirds the pointed wing; feet moderately 



robust, with upper half of tarsus feathered in front. Headcrestless; feather." 



of neck all round, distinctly lanceolate. No distinct web between middle 



and outer toes 



13. Haliseetus. Tail rounded, of 12 reetrices. Upper outline of cere nearly 

 straight; nostrils with lower end rounded, opening rather abruptly in- 

 ward. 



IJ. Thalassoaetus. Tail cuneate. of 14 reetrices. Upper outline of cero 

 much arched ; nostrils with lower end pointed and beveled gradually to 

 the level of the cere. (Extralimital; Kamtschatkan— and Aleutian?) 

 i-. Tail long, truncated, two thirds or more the very broad, rounded wing. 



Feet enormously robust, with nearly the whole tarsus naked. Head with a 



broad erectile crest of lengthened broad and rounded feathers; feathers of 



neck all round, broad and rounded. A moderately developed web between 



middle and outer toes. 



15. Thrasaetus. Secondaries greatly developed, both in length and breadth, 

 reaching to the end of primaries: fifth to seventh quills longest, the 

 outer seven with inner webs shallowly sinuated. Claws enormously 

 large and powerful, but rather obtuse, the inner and posterior ones 

 equal to their digits in length. (Extralimital; tropical.) 



Genus ELANOIDES Vieillot. 



Elanoides Tieiixot, Nouv. Diet. d'Hist. Nat. xxiv, 1818, 101. Type, Fa/co forflcatns Liyx. 

 Nauclerus Aucx. nee Vigoks, 1825, 



Chak. General external characters. Bill rather small and narrow, intermediate be- 

 tween that of Pandion and Elaniis; compressed anteriorly, and very broad <at the base; 

 the terminal hook well produced, the tomia very regular; cere ascending; nostril 

 broadly oval, oblique; gonys nearly straight; tomium of the lower mandible very eou- 

 ■vex. Lores densely feathered, the feathers bristle-like. Feet robust; tarsus a little 

 longer than the middle toe, covered with large, irregular, hexagonal scales; toes with 

 transverse scutellaa nearly to the base; claws short, strong, abruptly fi.attened beneath, 

 the edges very sharp, the middle claw bent laterally, the inner side very convex, the pro- 

 jecting edge sharp and entire. No web between the toes. Primaries and reetrices ex- 

 cessively elongated and narrow, the former more than twice the length of the second- 

 aries. Outer tail-feathers about equal to the primaries, and more than twice as long as 

 the middle pair. 



Osteological cliaracienr.* Cranium very similar in contour and proportions to that 

 of Fandion, but presenting important modifications in minor details. Superciliary 

 process of the lachrymal distinct from the frontal, which is completely anchylosed with 

 the nasal; inner convoluted edge of the palatines scarcely produced downward; nasal 

 septum completely ossified; pterygoid bone narrow, and of a uniform width throughout 

 its length. Sternum similar to that of _PnHrfioH,having, like it, apair of indentations on 

 the posterior m,argin.and destitute of foramina; the clavicle, coracoids, and scapula are 

 nlso very similar. 



Anatomical characters. "Palate flat with two longitudinal ridges; upper mandible 

 with atubereulate median ridge, lower deeply concave; posterior aperture of the nare.'S 

 oblongolinear, with the edges papillate. Tongue somewh.at decurved. emarginate, and 

 finely papillate at the base, fiat above, its tip narrow and acutely emarginate. CEsopha- , 



• Of this genus we have seen only the skull and sternum. 



