OBERHOLSER ] THE AVIAN GENUS BLEDA 163 
edge of nostrils, broader than high at base, its height at the latter 
point about equal to one-third of the exposed culmen ; culmen curved 
from base; gonys straight or very nearly so; maxilla with but one 
subterminal notch; nostrils linear, strongly operculate, the frontal 
feathering extending not beyond their posterior margin; bristles of 
nostrils rather few and of moderate length. 
Type.—Criniger ictericus STRICKLAND. 
In many of its characters this genus is far removed from Bleda, 
and is indeed much nearer even Thapsinillas. Its points of difference 
from all neighboring groups may be easily seen by consulting the 
diagnoses given. 
Apparently the only species referable here are: 
Acritillas icterica (Strickland). 
Acritillas chloris (Finsch). 
Acritillas lucasi (Hartert). 
ARIZELOCICHLA’ gen. nov. 
Chars. gen.—In some respects resembling Bleda, but nostrils 
linear, strongly operculate, the basal half of the operculum more or 
less feathered; bill much shorter, more turdine, depressed at base, 
its height at this point decidedly more than one-third the length of 
exposed culmen; culmen curved from base ; gonys almost horizontal ; 
tarsus very much longer than exposed culmen. 
Description—Tail about nine-tenths of wing, or somewhat more ; 
throat feathers not lengthened; tarsus scutellate; wing 334 to 44 
times the tarsus; tarsus 124 to 134 times the exposed culmen; head 
not crested ; nuchal hairs short, much branched; rictal bristles reach- 
ing about half way to end of bill; bill moderately slender, very thrush- 
like, somewhat depressed, higher than broad at anterior edge of 
nostrils, decidedly broader than high at base, its height at base more 
than one-third the length of exposed culmen; culmen curved nearly 
or quite from base; gonys only slightly ascending; maxilla with but 
one subterminal notch; nostrils linear, much operculate, the frontal 
feathering extending more or less continuously above them to about 
the middle of the operculum ; nasal bristles few and rather short. 
Type.—Xenocichla nigriceps SHELLEY. 
Excellent evidence of the hitherto unsatisfactory generic position 
of the type and several other species of this group is the manner in 
which various authors have treated them, placing them first in one 
genus, then in another, with scarcely any uniformity or agreement. 
Least of all the genera to which they have been at times referred 
lapitnaAoc, evidens; Kix/A7, turdus. 
