AND SOME ALLIED GENERA. 227 



b' . General color grayish or olive-browu, or olive- 

 green, outer edge of quills more or less strongly 

 tinged with olive. 

 a" . Sides of head entirely feathered. 



a'" . No post-superciliar tuft of long, pointed 

 feathers, 

 a*. Tail not strongly graduated. 



«5. No brush-like saifrau-yellow feathers 

 above the lores. 

 a^\ General color grayish brown or olive- 

 brown, crown-feathers not lengthened, 



no nuchal color Laedorusa. 



è". General appearance pachycephaline, 

 crown-feathers lengthened^ richly de- 

 veloped, black and silky. 

 a^. No red spot on the lower jaw . . Pachycephalixus. 

 h^. A red spot on the lower jaw . . Stictognathus. 

 V'. A bunch of saffran-yellow feathers 



above the lores Crocopsis. 



b*. Tail strongly graduated, diiference be- 

 tween central and outermost feathers 

 equal to the length of the tarsus . . . Xanthixus. 

 b"'. A long post-superciliar plumelet of pointed 



yellow feathers Kelaartia. 



h" . Sides of head above and behind the eye 



naked Gymnocrotaphus. 



B. Tarsus equal to culmen in length. 



a. Head distinctly crested. 



a'. Feathers of crown all lengthened, plumage 



striated Alcurus. 



b' . Feathers on centre of crown only lengthened, 

 plumage not striated. 



a". Crest not surpassing the culmen in length, 

 rump-feathers subterminally barred with 

 black. 



a'". Eyelid not wattled Pinarocichla. 



b'". Eyelid wattled Poliolophus. 



b". Crest very long, much surpassing the culmen 



in length, rump not barred Mesolophus. 



b. Head not crested, or very faintly so. 



a'. Lengthened rump-feathers unbarred, tail nearly 

 square, with no dark subterminal bar 



a" . Throat-feathers red, narrow and stiff . . . Ruhigula. 



b" . Throat-feathers soft, like lower surface in color Ixidia. 

 b' . Lengthened rump-feathers subterminally barred 



Notes from tlie Leyden IVEuseum, Vol. XVII. 



