30 HRIIODIONES 



a''. Under tail-coverts lengthened and 



stiffened to resemble the true rec- 



trices. 



a?. Black tail-feathers slightly forked, 



and of about the same length as 



the white under tail-coverts ; sides 



of the face and upper throat bare Ahdimi'i p. 32. 



V. Black tail-feathers very deeply 



forked, clearly exceeded in length 



by the stiffened under tail-coverts ; 



face and head feathered ; neck 



covered with woolly down Dts.s»?'o, p. 34. 



V. Under tail-coverts not stiffened or 

 elongated to resemble the true re- 

 trices. 

 a^. Edges of the mandible meeting 

 throughout their length, 

 n'. Culmen shorter than the tarsus, 



head and neck feathered Ciconirr, p. 37. 



6 ' Culmen about equal to the tarsus. 



«\ Head and neck feathered ; a 



flat frontal plate at the base 



of the bill E phippiorhynclius, p. 43. 



h-'. Head and neck bare or with a 

 sparse woolly covering only ; 



no frontal plate LepioptiJiis,^. 4^':). 



V. Edges of the mandible not meeting 



in the middle portion of the bill ; 



culmen distinctly longer than the 



tarsus; head and neck feathered... Annsfonum, p. 41. 



6'. Culmen rounded, not ridged ; distinctly 



down-curved at the tip ; crown and 



face naked Pseudotanfalus, p. 48. 



6. A distinct basal web between the middle 

 and inner and middle and outer toes 

 respectively ; claw of the middle toe pec- 

 tinated Scopus, p. 51. 



r. A basal web between the middle and outer 

 toe, obsolete between the inner and 

 middle toe ; claw of the middle toe pec- 

 tinated, 

 o'. With twelve tail-feathers. 



((-. Naked portion of the tibia equal to 

 or exceeding the inner toe and claw 

 in length. 

 <('. Plumage grey above, varied be- 

 neath, large birds with long legs. Ardea, ii. 55. 



