2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 'J2 



PH^OAETUS gen. nov. (Buteonidse) 

 Type : Falco limnaetus Horsfield.'' 



Similar to Lophotriorchis in abrupt emargination of five outer 

 primaries and densely bristled loral region, but differing conspicu- 

 ously in having the cere much narrower (across top) ; relatively 

 much larger and more produced bill ; in very different proportionate 

 length of toes, the inner (without claw) extending to decidedly 

 beyond penultimate articulation of middle toe ; tail about three- 

 fourths (instead of less than two-thirds) as long as wing; wing-tip 

 shorter, the longest primary exceeding outermost (distal) secondary 

 by less than one-third the length of wing ; middle toe (without claw) 

 less than half (instead of three-fourths) as long as tarsus; toes and 

 claws much stouter, the latter relatively shorter and less acute, and 

 uniform dusky coloration. 



(<I>at()s, brown, dusky; a€T6<i, eagle.) 



Species: Phccoactus limnaetus (Horsfield). 



MORPHNARCHUS gen. nov. (Buteonidae) 



Type : Leucopternis princeps Sclater. 



Similar to Leucopternis Kaup but differing in relatively shorter 

 and stouter tarsus (less than twice as long as middle toe without 

 claw), circular nostril, cuneate feathers of head and neck, and very 

 different coloration, the head, neck, chest and upper parts plain 

 black, the under parts (posterior to chest) white narrowly barred with 

 black ; loral and orbital regions nearly nude. 



(Md/a^vos, dusky, dark; apxo's, a leader or chief.) 



Species: Morphnarchus princeps (Sclater). 



PERCNOHIERAX gen. nov. (Buteonidae) 



Type: Falco leucorrhoiis Ouoy and Gaimard. 



Somewhat like Rupornis Kaup, but relative length of anterior toes 

 very different, the outer toe (without claw) not longer than the 

 inner and extending to barely beyond penultimate articulation of 

 middle toe (instead of to beyond middle of penultimate phalanx) ; 

 middle toe relatively longer (more, instead of less, than half as 

 long as tarsus) ; tarsus less (instead of more) than one-fourth as 



^ This species is the type of Limnaetus Vigors, which name is antedated by 

 Limnaetus Bowdich, the latter a synonym of Biitco. 



