CYCLORHIS. 885 
characters, is very similar to that of Falcunculus (of the Laniadex) 
of Australia, which it also resembles so much in other characters as 
usually to induce authors to bring the two together, either as ad- 
jacent genera, or as belonging to closely allied subfamilies. 
The difference generically between Cyclorhis and Vireolanius is 
very slight, and I cannot find any real ground of separation. In 
the latter the bill is perhaps lower and proportionally more elongated ; 
the culmen less curved; the tip longer and more curved, although C. 
nigrirostris differs from the other species of Cyclorhis in just these 
characters. The nostrils are perhaps more circular and smaller in 
Cyclorhis. 'The colors differ somewhat—the prevailing tints in 
Cyclorhis being olive green and dull yellow, as in the Vireos, while 
in Vireolanius they are deep verdigris green, bright blue and clear 
yellow (white below in type). If we were to limit Vireolanius to 
the type—melitophrys—the difference would be rather more appre- 
ciable. For the present, however, I keep the two groups separate. 
Although most of the species of the two genera are strictly - 
South American, I yet give all in detail, in order to furnish a com- 
plete monograph of the family of Vireonide. 
Common CuaractEers.—Above plain olive green; lower throat (sometimes 
breast, or whole under parts), axillars, inner face of wings, and inner edges 
of quills yellowish; rest of under parts whitish. A rufous band from 
nostrils over eye to nape, sometimes only to eye. Chin, and more or less 
of cheeks, ashy. Head above ashy, more or less pure, rarely like the back. 
Lower mandible in most species plumbeous black. 
A. Head above and nape, with the entire cheeks, ash color; 
the former sometimes glossed with ochraceous. 
Legs flesh color. Throat, jugulum, and breast yel- > 
low. 
Entire under parts (except chin) yellow - fiaviventris,} 
Beneath yellow; middle of belly to crissum 
whitish. 
Yellow mere extended, with decided 
olivaceous green tinge across the 
breast. Cheeks dark ash . . subflavescens, 
Yellow of breast more restricted, and 
scarcely olivaceous. Cheeks light 
ash. : ° - c - flavipectus. 
Legs dusky plumbeous. Lower throat and sides of 
breast yellowish. 
Superciliary rufous extending tonape. Lower 
\ . mandible plumbeous at base. 
1 Specimens from Guatemala lack the black spot of bill. 
25 May, 1866, 
