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OBERHOLSER] THE AVIAN GENUS BLEDA 171 
B.—Mazxillar tomium with but one subterminal notch. 
a.—Nostrils rounded oval. 
b.—Nuchal hairs long (25 mm. or more) and not branched; throat 
feathers lengthened. 
c.—Head not conspicuously crested; nasal operculum barely per- 
CEM CR NeReca ae Stacie elt mcieab ke whe ae oeals Alophoixus 
c’—Head conspicuously crested; nasal operculum evident, at 
LeaSteRpOStenioGhyan vers. eit sete ciedae. oss ota Trichophorus 
b’—Nuchal hairs short (less than 20 mm.) and much branched; 
throat feathers not lengthened. 
c.—Tarsus about equal to exposed culmen; height of bill at base 
not more than one-third the length of exposed culmen. 
Bleda 
c’—Tarsus at least one and one-fourth times the length of ex- 
_ posed culmen; height of bill at base more than one-third 
the length of exposed culmen. 
d.—Rictal bristles weak, not reaching beyond anterior edge 
of nostrils; narial vibrissae few and weak; bill longer, 
less compressed, its height at base decidedly less than 
LESH DLEAG tae eemtrcna ihr kee cei ctoke Thescelocichla 
d’.—Rictal bristles strong, about two-thirds the length of 
bill, reaching far beyond the anterior edge of nostrils; 
narial vibrissae long and numerous; bill shorter, more 
compressed, its height and breadth at base about 
cecil etl AS aes oe enn et ee PE Re Lea aru ee Idiocichla 
a’—Nostrils linear or lengthened oval. 
b.—Tarsus shorter than exposed culmen; wing more than five times 
ie length Oi the Parsus oti. suisse al gaye wae) cane Thapsinillas 
b’—Tarsus longer than exposed culmen; wing less than five times 
the length of the tarsus. 
c.—Height of bill at base more than one-third the length of ex- 
posed culmen. 
d.—Nostrils linear or nearly so; frontal feathering extend- 
ing on operculum at least to middle of nostril; rictal 
bristles reaching to about middle of bill. 
e.—Tail about equal to wing; bill stout, somewhat com- 
DECSSC Crater en Fane oT a heen cites Chlorocichla 
e’—Tail shorter than wing; bill rather slender, some- 
wilateedepnesse dhereuscr wie -octte ceracee Gee Arizelocichla 
d’.—Nostrils lengthened oval; frontal feathering not extend- 
ing beyond posterior edge of nostrils; rictal bristles 
not reaching to middle of bill. 
e.—Bill stouter, relatively shorter, somewhat compressed, 
about equal in height and breadth at base; nuchal 
MAIKSE GIO Cine are erable ora ster naeheiee 2 Atimastillas 
e’.—Bill weaker, relatively longer, depressed, its height 
at base decidedly less than its breadth; nuchal 
NAits el OWNS amare ety ws areal: Prosphorocichla 
c’.—Height of bill at base not more than one-third the length 
of exposed culmen. 
